27 files changed, 2896 insertions, 843 deletions

diff --git a/externals/httplib/README.md b/externals/httplib/README.md
index 0e26522b5..73037d297 100644
--- a/externals/httplib/README.md
+++ b/externals/httplib/README.md
@@ -1,4 +1,4 @@
-From https://github.com/yhirose/cpp-httplib/commit/d9479bc0b12e8a1e8bce2d34da4feeef488581f3
+From https://github.com/yhirose/cpp-httplib/tree/fce8e6fefdab4ad48bc5b25c98e5ebfda4f3cf53
 
 MIT License
 
diff --git a/externals/httplib/httplib.h b/externals/httplib/httplib.h
index fa2edcc94..e03842e6d 100644
--- a/externals/httplib/httplib.h
+++ b/externals/httplib/httplib.h
@@ -1,7 +1,7 @@
 //
 //  httplib.h
 //
-//  Copyright (c) 2019 Yuji Hirose. All rights reserved.
+//  Copyright (c) 2020 Yuji Hirose. All rights reserved.
 //  MIT License
 //
 
@@ -11,6 +11,7 @@
 /*
  * Configuration
  */
+
 #ifndef CPPHTTPLIB_KEEPALIVE_TIMEOUT_SECOND
 #define CPPHTTPLIB_KEEPALIVE_TIMEOUT_SECOND 5
 #endif
@@ -40,7 +41,7 @@
 #endif
 
 #ifndef CPPHTTPLIB_PAYLOAD_MAX_LENGTH
-#define CPPHTTPLIB_PAYLOAD_MAX_LENGTH (std::numeric_limits<size_t>::max)()
+#define CPPHTTPLIB_PAYLOAD_MAX_LENGTH (std::numeric_limits<size_t>::max())
 #endif
 
 #ifndef CPPHTTPLIB_RECV_BUFSIZ
@@ -48,9 +49,14 @@
 #endif
 
 #ifndef CPPHTTPLIB_THREAD_POOL_COUNT
-#define CPPHTTPLIB_THREAD_POOL_COUNT 8
+#define CPPHTTPLIB_THREAD_POOL_COUNT                                           \
+  (std::max(1u, std::thread::hardware_concurrency() - 1))
 #endif
 
+/*
+ * Headers
+ */
+
 #ifdef _WIN32
 #ifndef _CRT_SECURE_NO_WARNINGS
 #define _CRT_SECURE_NO_WARNINGS
@@ -62,9 +68,9 @@
 
 #if defined(_MSC_VER)
 #ifdef _WIN64
-typedef __int64 ssize_t;
+using ssize_t = __int64;
 #else
-typedef int ssize_t;
+using ssize_t = int;
 #endif
 
 #if _MSC_VER < 1900
@@ -100,7 +106,7 @@ typedef int ssize_t;
 #define strcasecmp _stricmp
 #endif // strcasecmp
 
-typedef SOCKET socket_t;
+using socket_t = SOCKET;
 #ifdef CPPHTTPLIB_USE_POLL
 #define poll(fds, nfds, timeout) WSAPoll(fds, nfds, timeout)
 #endif
@@ -109,23 +115,25 @@ typedef SOCKET socket_t;
 
 #include <arpa/inet.h>
 #include <cstring>
+#include <ifaddrs.h>
 #include <netdb.h>
 #include <netinet/in.h>
 #ifdef CPPHTTPLIB_USE_POLL
 #include <poll.h>
 #endif
+#include <csignal>
 #include <pthread.h>
-#include <signal.h>
 #include <sys/select.h>
 #include <sys/socket.h>
 #include <unistd.h>
 
-typedef int socket_t;
+using socket_t = int;
 #define INVALID_SOCKET (-1)
 #endif //_WIN32
 
-#include <assert.h>
+#include <array>
 #include <atomic>
+#include <cassert>
 #include <condition_variable>
 #include <errno.h>
 #include <fcntl.h>
@@ -143,9 +151,13 @@ typedef int socket_t;
 
 #ifdef CPPHTTPLIB_OPENSSL_SUPPORT
 #include <openssl/err.h>
+#include <openssl/md5.h>
 #include <openssl/ssl.h>
 #include <openssl/x509v3.h>
 
+#include <iomanip>
+#include <sstream>
+
 // #if OPENSSL_VERSION_NUMBER < 0x1010100fL
 // #error Sorry, OpenSSL versions prior to 1.1.1 are not supported
 // #endif
@@ -162,6 +174,9 @@ inline const unsigned char *ASN1_STRING_get0_data(const ASN1_STRING *asn1) {
 #include <zlib.h>
 #endif
 
+/*
+ * Declaration
+ */
 namespace httplib {
 
 namespace detail {
@@ -176,37 +191,15 @@ struct ci {
 
 } // namespace detail
 
-enum class HttpVersion { v1_0 = 0, v1_1 };
-
-typedef std::multimap<std::string, std::string, detail::ci> Headers;
-
-typedef std::multimap<std::string, std::string> Params;
-typedef std::smatch Match;
-
-typedef std::function<void(const char *data, size_t data_len)> DataSink;
-
-typedef std::function<void()> Done;
-
-typedef std::function<void(size_t offset, size_t length, DataSink sink,
-                           Done done)>
-    ContentProvider;
+using Headers = std::multimap<std::string, std::string, detail::ci>;
 
-typedef std::function<bool(const char *data, size_t data_length, size_t offset,
-                           uint64_t content_length)>
-    ContentReceiver;
+using Params = std::multimap<std::string, std::string>;
+using Match = std::smatch;
 
-typedef std::function<bool(uint64_t current, uint64_t total)> Progress;
+using Progress = std::function<bool(uint64_t current, uint64_t total)>;
 
 struct Response;
-typedef std::function<bool(const Response &response)> ResponseHandler;
-
-struct MultipartFile {
-  std::string filename;
-  std::string content_type;
-  size_t offset = 0;
-  size_t length = 0;
-};
-typedef std::multimap<std::string, MultipartFile> MultipartFiles;
+using ResponseHandler = std::function<bool(const Response &response)>;
 
 struct MultipartFormData {
   std::string name;
@@ -214,10 +207,53 @@ struct MultipartFormData {
   std::string filename;
   std::string content_type;
 };
-typedef std::vector<MultipartFormData> MultipartFormDataItems;
+using MultipartFormDataItems = std::vector<MultipartFormData>;
+using MultipartFormDataMap = std::multimap<std::string, MultipartFormData>;
+
+class DataSink {
+public:
+  DataSink() = default;
+  DataSink(const DataSink &) = delete;
+  DataSink &operator=(const DataSink &) = delete;
+  DataSink(DataSink &&) = delete;
+  DataSink &operator=(DataSink &&) = delete;
+
+  std::function<void(const char *data, size_t data_len)> write;
+  std::function<void()> done;
+  std::function<bool()> is_writable;
+};
+
+using ContentProvider =
+    std::function<void(size_t offset, size_t length, DataSink &sink)>;
+
+using ContentReceiver =
+    std::function<bool(const char *data, size_t data_length)>;
+
+using MultipartContentHeader =
+    std::function<bool(const MultipartFormData &file)>;
+
+class ContentReader {
+public:
+  using Reader = std::function<bool(ContentReceiver receiver)>;
+  using MultipartReader = std::function<bool(MultipartContentHeader header,
+                                             ContentReceiver receiver)>;
+
+  ContentReader(Reader reader, MultipartReader muitlpart_reader)
+      : reader_(reader), muitlpart_reader_(muitlpart_reader) {}
+
+  bool operator()(MultipartContentHeader header,
+                  ContentReceiver receiver) const {
+    return muitlpart_reader_(header, receiver);
+  }
+
+  bool operator()(ContentReceiver receiver) const { return reader_(receiver); }
+
+  Reader reader_;
+  MultipartReader muitlpart_reader_;
+};
 
-typedef std::pair<ssize_t, ssize_t> Range;
-typedef std::vector<Range> Ranges;
+using Range = std::pair<ssize_t, ssize_t>;
+using Ranges = std::vector<Range>;
 
 struct Request {
   std::string method;
@@ -229,7 +265,7 @@ struct Request {
   std::string version;
   std::string target;
   Params params;
-  MultipartFiles files;
+  MultipartFormDataMap files;
   Ranges ranges;
   Match matches;
 
@@ -253,13 +289,19 @@ struct Request {
   std::string get_param_value(const char *key, size_t id = 0) const;
   size_t get_param_value_count(const char *key) const;
 
+  bool is_multipart_form_data() const;
+
   bool has_file(const char *key) const;
-  MultipartFile get_file_value(const char *key) const;
+  MultipartFormData get_file_value(const char *key) const;
+
+  // private members...
+  size_t content_length;
+  ContentProvider content_provider;
 };
 
 struct Response {
   std::string version;
-  int status;
+  int status = -1;
   Headers headers;
   std::string body;
 
@@ -269,106 +311,81 @@ struct Response {
   void set_header(const char *key, const char *val);
   void set_header(const char *key, const std::string &val);
 
-  void set_redirect(const char *uri);
+  void set_redirect(const char *url);
   void set_content(const char *s, size_t n, const char *content_type);
   void set_content(const std::string &s, const char *content_type);
 
   void set_content_provider(
       size_t length,
-      std::function<void(size_t offset, size_t length, DataSink sink)> provider,
+      std::function<void(size_t offset, size_t length, DataSink &sink)>
+          provider,
       std::function<void()> resource_releaser = [] {});
 
   void set_chunked_content_provider(
-      std::function<void(size_t offset, DataSink sink, Done done)> provider,
+      std::function<void(size_t offset, DataSink &sink)> provider,
       std::function<void()> resource_releaser = [] {});
 
-  Response() : status(-1), content_provider_resource_length(0) {}
-
+  Response() = default;
+  Response(const Response &) = default;
+  Response &operator=(const Response &) = default;
+  Response(Response &&) = default;
+  Response &operator=(Response &&) = default;
   ~Response() {
     if (content_provider_resource_releaser) {
       content_provider_resource_releaser();
     }
   }
 
-  size_t content_provider_resource_length;
+  // private members...
+  size_t content_length = 0;
   ContentProvider content_provider;
   std::function<void()> content_provider_resource_releaser;
 };
 
 class Stream {
 public:
-  virtual ~Stream() {}
+  virtual ~Stream() = default;
+
+  virtual bool is_readable() const = 0;
+  virtual bool is_writable() const = 0;
+
   virtual int read(char *ptr, size_t size) = 0;
-  virtual int write(const char *ptr, size_t size1) = 0;
-  virtual int write(const char *ptr) = 0;
-  virtual int write(const std::string &s) = 0;
+  virtual int write(const char *ptr, size_t size) = 0;
   virtual std::string get_remote_addr() const = 0;
 
   template <typename... Args>
   int write_format(const char *fmt, const Args &... args);
-};
-
-class SocketStream : public Stream {
-public:
-  SocketStream(socket_t sock);
-  virtual ~SocketStream();
-
-  virtual int read(char *ptr, size_t size);
-  virtual int write(const char *ptr, size_t size);
-  virtual int write(const char *ptr);
-  virtual int write(const std::string &s);
-  virtual std::string get_remote_addr() const;
-
-private:
-  socket_t sock_;
-};
-
-class BufferStream : public Stream {
-public:
-  BufferStream() {}
-  virtual ~BufferStream() {}
-
-  virtual int read(char *ptr, size_t size);
-  virtual int write(const char *ptr, size_t size);
-  virtual int write(const char *ptr);
-  virtual int write(const std::string &s);
-  virtual std::string get_remote_addr() const;
-
-  const std::string &get_buffer() const;
-
-private:
-  std::string buffer;
+  int write(const char *ptr);
+  int write(const std::string &s);
 };
 
 class TaskQueue {
 public:
-  TaskQueue() {}
-  virtual ~TaskQueue() {}
+  TaskQueue() = default;
+  virtual ~TaskQueue() = default;
   virtual void enqueue(std::function<void()> fn) = 0;
   virtual void shutdown() = 0;
 };
 
-#if CPPHTTPLIB_THREAD_POOL_COUNT > 0
 class ThreadPool : public TaskQueue {
 public:
-  ThreadPool(size_t n) : shutdown_(false) {
+  explicit ThreadPool(size_t n) : shutdown_(false) {
     while (n) {
-      auto t = std::make_shared<std::thread>(worker(*this));
-      threads_.push_back(t);
+      threads_.emplace_back(worker(*this));
       n--;
     }
   }
 
   ThreadPool(const ThreadPool &) = delete;
-  virtual ~ThreadPool() {}
+  ~ThreadPool() override = default;
 
-  virtual void enqueue(std::function<void()> fn) override {
+  void enqueue(std::function<void()> fn) override {
     std::unique_lock<std::mutex> lock(mutex_);
     jobs_.push_back(fn);
     cond_.notify_one();
   }
 
-  virtual void shutdown() override {
+  void shutdown() override {
     // Stop all worker threads...
     {
       std::unique_lock<std::mutex> lock(mutex_);
@@ -378,14 +395,14 @@ public:
     cond_.notify_all();
 
     // Join...
-    for (auto t : threads_) {
-      t->join();
+    for (auto &t : threads_) {
+      t.join();
     }
   }
 
 private:
   struct worker {
-    worker(ThreadPool &pool) : pool_(pool) {}
+    explicit worker(ThreadPool &pool) : pool_(pool) {}
 
     void operator()() {
       for (;;) {
@@ -411,7 +428,7 @@ private:
   };
   friend struct worker;
 
-  std::vector<std::shared_ptr<std::thread>> threads_;
+  std::vector<std::thread> threads_;
   std::list<std::function<void()>> jobs_;
 
   bool shutdown_;
@@ -419,46 +436,16 @@ private:
   std::condition_variable cond_;
   std::mutex mutex_;
 };
-#else
-class Threads : public TaskQueue {
-public:
-  Threads() : running_threads_(0) {}
-  virtual ~Threads() {}
-
-  virtual void enqueue(std::function<void()> fn) override {
-    std::thread([=]() {
-      {
-        std::lock_guard<std::mutex> guard(running_threads_mutex_);
-        running_threads_++;
-      }
-
-      fn();
-
-      {
-        std::lock_guard<std::mutex> guard(running_threads_mutex_);
-        running_threads_--;
-      }
-    }).detach();
-  }
-
-  virtual void shutdown() override {
-    for (;;) {
-      std::this_thread::sleep_for(std::chrono::milliseconds(10));
-      std::lock_guard<std::mutex> guard(running_threads_mutex_);
-      if (!running_threads_) { break; }
-    }
-  }
 
-private:
-  std::mutex running_threads_mutex_;
-  int running_threads_;
-};
-#endif
+using Logger = std::function<void(const Request &, const Response &)>;
 
 class Server {
 public:
-  typedef std::function<void(const Request &, Response &)> Handler;
-  typedef std::function<void(const Request &, const Response &)> Logger;
+  using Handler = std::function<void(const Request &, Response &)>;
+  using HandlerWithContentReader = std::function<void(
+      const Request &, Response &, const ContentReader &content_reader)>;
+  using Expect100ContinueHandler =
+      std::function<int(const Request &, Response &)>;
 
   Server();
 
@@ -468,21 +455,32 @@ public:
 
   Server &Get(const char *pattern, Handler handler);
   Server &Post(const char *pattern, Handler handler);
-
+  Server &Post(const char *pattern, HandlerWithContentReader handler);
   Server &Put(const char *pattern, Handler handler);
+  Server &Put(const char *pattern, HandlerWithContentReader handler);
   Server &Patch(const char *pattern, Handler handler);
+  Server &Patch(const char *pattern, HandlerWithContentReader handler);
   Server &Delete(const char *pattern, Handler handler);
   Server &Options(const char *pattern, Handler handler);
 
-  bool set_base_dir(const char *path);
+  [[deprecated]] bool set_base_dir(const char *dir,
+                                   const char *mount_point = nullptr);
+  bool set_mount_point(const char *mount_point, const char *dir);
+  bool remove_mount_point(const char *mount_point);
+  void set_file_extension_and_mimetype_mapping(const char *ext,
+                                               const char *mime);
   void set_file_request_handler(Handler handler);
 
   void set_error_handler(Handler handler);
   void set_logger(Logger logger);
 
+  void set_expect_100_continue_handler(Expect100ContinueHandler handler);
+
   void set_keep_alive_max_count(size_t count);
+  void set_read_timeout(time_t sec, time_t usec);
   void set_payload_max_length(size_t length);
 
+  bool bind_to_port(const char *host, int port, int socket_flags = 0);
   int bind_to_any_port(const char *host, int socket_flags = 0);
   bool listen_after_bind();
 
@@ -496,22 +494,29 @@ public:
 protected:
   bool process_request(Stream &strm, bool last_connection,
                        bool &connection_close,
-                       std::function<void(Request &)> setup_request);
+                       const std::function<void(Request &)> &setup_request);
 
   size_t keep_alive_max_count_;
+  time_t read_timeout_sec_;
+  time_t read_timeout_usec_;
   size_t payload_max_length_;
 
 private:
-  typedef std::vector<std::pair<std::regex, Handler>> Handlers;
+  using Handlers = std::vector<std::pair<std::regex, Handler>>;
+  using HandlersForContentReader =
+      std::vector<std::pair<std::regex, HandlerWithContentReader>>;
 
   socket_t create_server_socket(const char *host, int port,
                                 int socket_flags) const;
   int bind_internal(const char *host, int port, int socket_flags);
   bool listen_internal();
 
-  bool routing(Request &req, Response &res);
-  bool handle_file_request(Request &req, Response &res);
+  bool routing(Request &req, Response &res, Stream &strm, bool last_connection);
+  bool handle_file_request(Request &req, Response &res, bool head = false);
   bool dispatch_request(Request &req, Response &res, Handlers &handlers);
+  bool dispatch_request_for_content_reader(Request &req, Response &res,
+                                           ContentReader content_reader,
+                                           HandlersForContentReader &handlers);
 
   bool parse_request_line(const char *s, Request &req);
   bool write_response(Stream &strm, bool last_connection, const Request &req,
@@ -519,26 +524,43 @@ private:
   bool write_content_with_provider(Stream &strm, const Request &req,
                                    Response &res, const std::string &boundary,
                                    const std::string &content_type);
+  bool read_content(Stream &strm, bool last_connection, Request &req,
+                    Response &res);
+  bool read_content_with_content_receiver(
+      Stream &strm, bool last_connection, Request &req, Response &res,
+      ContentReceiver receiver, MultipartContentHeader multipart_header,
+      ContentReceiver multipart_receiver);
+  bool read_content_core(Stream &strm, bool last_connection, Request &req,
+                         Response &res, ContentReceiver receiver,
+                         MultipartContentHeader mulitpart_header,
+                         ContentReceiver multipart_receiver);
 
   virtual bool process_and_close_socket(socket_t sock);
 
   std::atomic<bool> is_running_;
   std::atomic<socket_t> svr_sock_;
-  std::string base_dir_;
+  std::vector<std::pair<std::string, std::string>> base_dirs_;
+  std::map<std::string, std::string> file_extension_and_mimetype_map_;
   Handler file_request_handler_;
   Handlers get_handlers_;
   Handlers post_handlers_;
+  HandlersForContentReader post_handlers_for_content_reader_;
   Handlers put_handlers_;
+  HandlersForContentReader put_handlers_for_content_reader_;
   Handlers patch_handlers_;
+  HandlersForContentReader patch_handlers_for_content_reader_;
   Handlers delete_handlers_;
   Handlers options_handlers_;
   Handler error_handler_;
   Logger logger_;
+  Expect100ContinueHandler expect_100_continue_handler_;
 };
 
 class Client {
 public:
-  Client(const char *host, int port = 80, time_t timeout_sec = 300);
+  explicit Client(const std::string &host, int port = 80,
+                  const std::string &client_cert_path = std::string(),
+                  const std::string &client_key_path = std::string());
 
   virtual ~Client();
 
@@ -586,6 +608,15 @@ public:
                                  const std::string &body,
                                  const char *content_type);
 
+  std::shared_ptr<Response> Post(const char *path, size_t content_length,
+                                 ContentProvider content_provider,
+                                 const char *content_type);
+
+  std::shared_ptr<Response> Post(const char *path, const Headers &headers,
+                                 size_t content_length,
+                                 ContentProvider content_provider,
+                                 const char *content_type);
+
   std::shared_ptr<Response> Post(const char *path, const Params &params);
 
   std::shared_ptr<Response> Post(const char *path, const Headers &headers,
@@ -604,6 +635,20 @@ public:
                                 const std::string &body,
                                 const char *content_type);
 
+  std::shared_ptr<Response> Put(const char *path, size_t content_length,
+                                ContentProvider content_provider,
+                                const char *content_type);
+
+  std::shared_ptr<Response> Put(const char *path, const Headers &headers,
+                                size_t content_length,
+                                ContentProvider content_provider,
+                                const char *content_type);
+
+  std::shared_ptr<Response> Put(const char *path, const Params &params);
+
+  std::shared_ptr<Response> Put(const char *path, const Headers &headers,
+                                const Params &params);
+
   std::shared_ptr<Response> Patch(const char *path, const std::string &body,
                                   const char *content_type);
 
@@ -611,6 +656,15 @@ public:
                                   const std::string &body,
                                   const char *content_type);
 
+  std::shared_ptr<Response> Patch(const char *path, size_t content_length,
+                                  ContentProvider content_provider,
+                                  const char *content_type);
+
+  std::shared_ptr<Response> Patch(const char *path, const Headers &headers,
+                                  size_t content_length,
+                                  ContentProvider content_provider,
+                                  const char *content_type);
+
   std::shared_ptr<Response> Delete(const char *path);
 
   std::shared_ptr<Response> Delete(const char *path, const std::string &body,
@@ -631,9 +685,33 @@ public:
   bool send(const std::vector<Request> &requests,
             std::vector<Response> &responses);
 
+  void set_timeout_sec(time_t timeout_sec);
+
+  void set_read_timeout(time_t sec, time_t usec);
+
   void set_keep_alive_max_count(size_t count);
 
-  void follow_location(bool on);
+  void set_basic_auth(const char *username, const char *password);
+
+#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
+  void set_digest_auth(const char *username, const char *password);
+#endif
+
+  void set_follow_location(bool on);
+
+  void set_compress(bool on);
+
+  void set_interface(const char *intf);
+
+  void set_proxy(const char *host, int port);
+
+  void set_proxy_basic_auth(const char *username, const char *password);
+
+#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
+  void set_proxy_digest_auth(const char *username, const char *password);
+#endif
+
+  void set_logger(Logger logger);
 
 protected:
   bool process_request(Stream &strm, const Request &req, Response &res,
@@ -641,16 +719,85 @@ protected:
 
   const std::string host_;
   const int port_;
-  time_t timeout_sec_;
   const std::string host_and_port_;
-  size_t keep_alive_max_count_;
-  size_t follow_location_;
+
+  // Settings
+  std::string client_cert_path_;
+  std::string client_key_path_;
+
+  time_t timeout_sec_ = 300;
+  time_t read_timeout_sec_ = CPPHTTPLIB_READ_TIMEOUT_SECOND;
+  time_t read_timeout_usec_ = CPPHTTPLIB_READ_TIMEOUT_USECOND;
+
+  size_t keep_alive_max_count_ = CPPHTTPLIB_KEEPALIVE_MAX_COUNT;
+
+  std::string basic_auth_username_;
+  std::string basic_auth_password_;
+#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
+  std::string digest_auth_username_;
+  std::string digest_auth_password_;
+#endif
+
+  bool follow_location_ = false;
+
+  bool compress_ = false;
+
+  std::string interface_;
+
+  std::string proxy_host_;
+  int proxy_port_;
+
+  std::string proxy_basic_auth_username_;
+  std::string proxy_basic_auth_password_;
+#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
+  std::string proxy_digest_auth_username_;
+  std::string proxy_digest_auth_password_;
+#endif
+
+  Logger logger_;
+
+  void copy_settings(const Client &rhs) {
+    client_cert_path_ = rhs.client_cert_path_;
+    client_key_path_ = rhs.client_key_path_;
+    timeout_sec_ = rhs.timeout_sec_;
+    read_timeout_sec_ = rhs.read_timeout_sec_;
+    read_timeout_usec_ = rhs.read_timeout_usec_;
+    keep_alive_max_count_ = rhs.keep_alive_max_count_;
+    basic_auth_username_ = rhs.basic_auth_username_;
+    basic_auth_password_ = rhs.basic_auth_password_;
+#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
+    digest_auth_username_ = rhs.digest_auth_username_;
+    digest_auth_password_ = rhs.digest_auth_password_;
+#endif
+    follow_location_ = rhs.follow_location_;
+    compress_ = rhs.compress_;
+    interface_ = rhs.interface_;
+    proxy_host_ = rhs.proxy_host_;
+    proxy_port_ = rhs.proxy_port_;
+    proxy_basic_auth_username_ = rhs.proxy_basic_auth_username_;
+    proxy_basic_auth_password_ = rhs.proxy_basic_auth_password_;
+#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
+    proxy_digest_auth_username_ = rhs.proxy_digest_auth_username_;
+    proxy_digest_auth_password_ = rhs.proxy_digest_auth_password_;
+#endif
+    logger_ = rhs.logger_;
+  }
 
 private:
   socket_t create_client_socket() const;
   bool read_response_line(Stream &strm, Response &res);
-  void write_request(Stream &strm, const Request &req, bool last_connection);
+  bool write_request(Stream &strm, const Request &req, bool last_connection);
   bool redirect(const Request &req, Response &res);
+  bool handle_request(Stream &strm, const Request &req, Response &res,
+                      bool last_connection, bool &connection_close);
+#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
+  bool connect(socket_t sock, Response &res, bool &error);
+#endif
+
+  std::shared_ptr<Response> send_with_content_provider(
+      const char *method, const char *path, const Headers &headers,
+      const std::string &body, size_t content_length,
+      ContentProvider content_provider, const char *content_type);
 
   virtual bool process_and_close_socket(
       socket_t sock, size_t request_count,
@@ -692,22 +839,6 @@ inline void Post(std::vector<Request> &requests, const char *path,
 }
 
 #ifdef CPPHTTPLIB_OPENSSL_SUPPORT
-class SSLSocketStream : public Stream {
-public:
-  SSLSocketStream(socket_t sock, SSL *ssl);
-  virtual ~SSLSocketStream();
-
-  virtual int read(char *ptr, size_t size);
-  virtual int write(const char *ptr, size_t size);
-  virtual int write(const char *ptr);
-  virtual int write(const std::string &s);
-  virtual std::string get_remote_addr() const;
-
-private:
-  socket_t sock_;
-  SSL *ssl_;
-};
-
 class SSLServer : public Server {
 public:
   SSLServer(const char *cert_path, const char *private_key_path,
@@ -727,9 +858,9 @@ private:
 
 class SSLClient : public Client {
 public:
-  SSLClient(const char *host, int port = 443, time_t timeout_sec = 300,
-            const char *client_cert_path = nullptr,
-            const char *client_key_path = nullptr);
+  SSLClient(const std::string &host, int port = 443,
+            const std::string &client_cert_path = std::string(),
+            const std::string &client_key_path = std::string());
 
   virtual ~SSLClient();
 
@@ -737,11 +868,12 @@ public:
 
   void set_ca_cert_path(const char *ca_ceert_file_path,
                         const char *ca_cert_dir_path = nullptr);
+
   void enable_server_certificate_verification(bool enabled);
 
   long get_openssl_verify_result() const;
 
-  SSL_CTX* ssl_context() const noexcept;
+  SSL_CTX *ssl_context() const noexcept;
 
 private:
   virtual bool process_and_close_socket(
@@ -759,6 +891,7 @@ private:
   SSL_CTX *ctx_;
   std::mutex ctx_mutex_;
   std::vector<std::string> host_components_;
+
   std::string ca_cert_file_path_;
   std::string ca_cert_dir_path_;
   bool server_certificate_verification_ = false;
@@ -766,9 +899,12 @@ private:
 };
 #endif
 
+// ----------------------------------------------------------------------------
+
 /*
  * Implementation
  */
+
 namespace detail {
 
 inline bool is_hex(char c, int &v) {
@@ -932,8 +1068,8 @@ inline void read_file(const std::string &path, std::string &out) {
 
 inline std::string file_extension(const std::string &path) {
   std::smatch m;
-  auto pat = std::regex("\\.([a-zA-Z0-9]+)$");
-  if (std::regex_search(path, m, pat)) { return m[1].str(); }
+  static auto re = std::regex("\\.([a-zA-Z0-9]+)$");
+  if (std::regex_search(path, m, re)) { return m[1].str(); }
   return std::string();
 }
 
@@ -976,6 +1112,11 @@ public:
     }
   }
 
+  bool end_with_crlf() const {
+    auto end = ptr() + size();
+    return size() >= 2 && end[-2] == '\r' && end[-1] == '\n';
+  }
+
   bool getline() {
     fixed_buffer_used_size_ = 0;
     glowable_buffer_.clear();
@@ -1019,7 +1160,7 @@ private:
   Stream &strm_;
   char *fixed_buffer_;
   const size_t fixed_buffer_size_;
-  size_t fixed_buffer_used_size_;
+  size_t fixed_buffer_used_size_ = 0;
   std::string glowable_buffer_;
 };
 
@@ -1053,6 +1194,28 @@ inline int select_read(socket_t sock, time_t sec, time_t usec) {
 #endif
 }
 
+inline int select_write(socket_t sock, time_t sec, time_t usec) {
+#ifdef CPPHTTPLIB_USE_POLL
+  struct pollfd pfd_read;
+  pfd_read.fd = sock;
+  pfd_read.events = POLLOUT;
+
+  auto timeout = static_cast<int>(sec * 1000 + usec / 1000);
+
+  return poll(&pfd_read, 1, timeout);
+#else
+  fd_set fds;
+  FD_ZERO(&fds);
+  FD_SET(sock, &fds);
+
+  timeval tv;
+  tv.tv_sec = static_cast<long>(sec);
+  tv.tv_usec = static_cast<long>(usec);
+
+  return select(static_cast<int>(sock + 1), nullptr, &fds, nullptr, &tv);
+#endif
+}
+
 inline bool wait_until_socket_is_ready(socket_t sock, time_t sec, time_t usec) {
 #ifdef CPPHTTPLIB_USE_POLL
   struct pollfd pfd_read;
@@ -1065,7 +1228,8 @@ inline bool wait_until_socket_is_ready(socket_t sock, time_t sec, time_t usec) {
       pfd_read.revents & (POLLIN | POLLOUT)) {
     int error = 0;
     socklen_t len = sizeof(error);
-    return getsockopt(sock, SOL_SOCKET, SO_ERROR, reinterpret_cast<char*>(&error), &len) >= 0 &&
+    return getsockopt(sock, SOL_SOCKET, SO_ERROR,
+                      reinterpret_cast<char *>(&error), &len) >= 0 &&
            !error;
   }
   return false;
@@ -1085,27 +1249,86 @@ inline bool wait_until_socket_is_ready(socket_t sock, time_t sec, time_t usec) {
       (FD_ISSET(sock, &fdsr) || FD_ISSET(sock, &fdsw))) {
     int error = 0;
     socklen_t len = sizeof(error);
-    return getsockopt(sock, SOL_SOCKET, SO_ERROR, (char *)&error, &len) >= 0 &&
+    return getsockopt(sock, SOL_SOCKET, SO_ERROR,
+                      reinterpret_cast<char *>(&error), &len) >= 0 &&
            !error;
   }
   return false;
 #endif
 }
 
+class SocketStream : public Stream {
+public:
+  SocketStream(socket_t sock, time_t read_timeout_sec,
+               time_t read_timeout_usec);
+  ~SocketStream() override;
+
+  bool is_readable() const override;
+  bool is_writable() const override;
+  int read(char *ptr, size_t size) override;
+  int write(const char *ptr, size_t size) override;
+  std::string get_remote_addr() const override;
+
+private:
+  socket_t sock_;
+  time_t read_timeout_sec_;
+  time_t read_timeout_usec_;
+};
+
+#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
+class SSLSocketStream : public Stream {
+public:
+  SSLSocketStream(socket_t sock, SSL *ssl, time_t read_timeout_sec,
+                  time_t read_timeout_usec);
+  virtual ~SSLSocketStream();
+
+  bool is_readable() const override;
+  bool is_writable() const override;
+  int read(char *ptr, size_t size) override;
+  int write(const char *ptr, size_t size) override;
+  std::string get_remote_addr() const override;
+
+private:
+  socket_t sock_;
+  SSL *ssl_;
+  time_t read_timeout_sec_;
+  time_t read_timeout_usec_;
+};
+#endif
+
+class BufferStream : public Stream {
+public:
+  BufferStream() = default;
+  ~BufferStream() override = default;
+
+  bool is_readable() const override;
+  bool is_writable() const override;
+  int read(char *ptr, size_t size) override;
+  int write(const char *ptr, size_t size) override;
+  std::string get_remote_addr() const override;
+
+  const std::string &get_buffer() const;
+
+private:
+  std::string buffer;
+  int position = 0;
+};
+
 template <typename T>
-inline bool process_and_close_socket(bool is_client_request, socket_t sock,
-                                     size_t keep_alive_max_count, T callback) {
+inline bool process_socket(bool is_client_request, socket_t sock,
+                           size_t keep_alive_max_count, time_t read_timeout_sec,
+                           time_t read_timeout_usec, T callback) {
   assert(keep_alive_max_count > 0);
 
-  bool ret = false;
+  auto ret = false;
 
   if (keep_alive_max_count > 1) {
     auto count = keep_alive_max_count;
     while (count > 0 &&
            (is_client_request ||
-            detail::select_read(sock, CPPHTTPLIB_KEEPALIVE_TIMEOUT_SECOND,
-                                CPPHTTPLIB_KEEPALIVE_TIMEOUT_USECOND) > 0)) {
-      SocketStream strm(sock);
+            select_read(sock, CPPHTTPLIB_KEEPALIVE_TIMEOUT_SECOND,
+                        CPPHTTPLIB_KEEPALIVE_TIMEOUT_USECOND) > 0)) {
+      SocketStream strm(sock, read_timeout_sec, read_timeout_usec);
       auto last_connection = count == 1;
       auto connection_close = false;
 
@@ -1114,12 +1337,22 @@ inline bool process_and_close_socket(bool is_client_request, socket_t sock,
 
       count--;
     }
-  } else {
-    SocketStream strm(sock);
+  } else { // keep_alive_max_count  is 0 or 1
+    SocketStream strm(sock, read_timeout_sec, read_timeout_usec);
     auto dummy_connection_close = false;
     ret = callback(strm, true, dummy_connection_close);
   }
 
+  return ret;
+}
+
+template <typename T>
+inline bool process_and_close_socket(bool is_client_request, socket_t sock,
+                                     size_t keep_alive_max_count,
+                                     time_t read_timeout_sec,
+                                     time_t read_timeout_usec, T callback) {
+  auto ret = process_socket(is_client_request, sock, keep_alive_max_count,
+                            read_timeout_sec, read_timeout_usec, callback);
   close_socket(sock);
   return ret;
 }
@@ -1165,6 +1398,23 @@ socket_t create_socket(const char *host, int port, Fn fn,
 #ifdef _WIN32
     auto sock = WSASocketW(rp->ai_family, rp->ai_socktype, rp->ai_protocol,
                            nullptr, 0, WSA_FLAG_NO_HANDLE_INHERIT);
+    /**
+     * Since the WSA_FLAG_NO_HANDLE_INHERIT is only supported on Windows 7 SP1
+     * and above the socket creation fails on older Windows Systems.
+     *
+     * Let's try to create a socket the old way in this case.
+     *
+     * Reference:
+     * https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-wsasocketa
+     *
+     * WSA_FLAG_NO_HANDLE_INHERIT:
+     * This flag is supported on Windows 7 with SP1, Windows Server 2008 R2 with
+     * SP1, and later
+     *
+     */
+    if (sock == INVALID_SOCKET) {
+      sock = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
+    }
 #else
     auto sock = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
 #endif
@@ -1176,9 +1426,11 @@ socket_t create_socket(const char *host, int port, Fn fn,
 
     // Make 'reuse address' option available
     int yes = 1;
-    setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, reinterpret_cast<char*>(&yes), sizeof(yes));
+    setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, reinterpret_cast<char *>(&yes),
+               sizeof(yes));
 #ifdef SO_REUSEPORT
-    setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, reinterpret_cast<char*>(&yes), sizeof(yes));
+    setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, reinterpret_cast<char *>(&yes),
+               sizeof(yes));
 #endif
 
     // bind or connect
@@ -1213,27 +1465,105 @@ inline bool is_connection_error() {
 #endif
 }
 
+inline bool bind_ip_address(socket_t sock, const char *host) {
+  struct addrinfo hints;
+  struct addrinfo *result;
+
+  memset(&hints, 0, sizeof(struct addrinfo));
+  hints.ai_family = AF_UNSPEC;
+  hints.ai_socktype = SOCK_STREAM;
+  hints.ai_protocol = 0;
+
+  if (getaddrinfo(host, "0", &hints, &result)) { return false; }
+
+  auto ret = false;
+  for (auto rp = result; rp; rp = rp->ai_next) {
+    const auto &ai = *rp;
+    if (!::bind(sock, ai.ai_addr, static_cast<int>(ai.ai_addrlen))) {
+      ret = true;
+      break;
+    }
+  }
+
+  freeaddrinfo(result);
+  return ret;
+}
+
+inline std::string if2ip(const std::string &ifn) {
+#ifndef _WIN32
+  struct ifaddrs *ifap;
+  getifaddrs(&ifap);
+  for (auto ifa = ifap; ifa; ifa = ifa->ifa_next) {
+    if (ifa->ifa_addr && ifn == ifa->ifa_name) {
+      if (ifa->ifa_addr->sa_family == AF_INET) {
+        auto sa = reinterpret_cast<struct sockaddr_in *>(ifa->ifa_addr);
+        char buf[INET_ADDRSTRLEN];
+        if (inet_ntop(AF_INET, &sa->sin_addr, buf, INET_ADDRSTRLEN)) {
+          freeifaddrs(ifap);
+          return std::string(buf, INET_ADDRSTRLEN);
+        }
+      }
+    }
+  }
+  freeifaddrs(ifap);
+#endif
+  return std::string();
+}
+
+inline socket_t create_client_socket(const char *host, int port,
+                                     time_t timeout_sec,
+                                     const std::string &intf) {
+  return create_socket(
+      host, port, [&](socket_t sock, struct addrinfo &ai) -> bool {
+        if (!intf.empty()) {
+          auto ip = if2ip(intf);
+          if (ip.empty()) { ip = intf; }
+          if (!bind_ip_address(sock, ip.c_str())) { return false; }
+        }
+
+        set_nonblocking(sock, true);
+
+        auto ret = ::connect(sock, ai.ai_addr, static_cast<int>(ai.ai_addrlen));
+        if (ret < 0) {
+          if (is_connection_error() ||
+              !wait_until_socket_is_ready(sock, timeout_sec, 0)) {
+            close_socket(sock);
+            return false;
+          }
+        }
+
+        set_nonblocking(sock, false);
+        return true;
+      });
+}
+
 inline std::string get_remote_addr(socket_t sock) {
   struct sockaddr_storage addr;
   socklen_t len = sizeof(addr);
 
   if (!getpeername(sock, reinterpret_cast<struct sockaddr *>(&addr), &len)) {
-    char ipstr[NI_MAXHOST];
+    std::array<char, NI_MAXHOST> ipstr{};
 
-    if (!getnameinfo(reinterpret_cast<struct sockaddr *>(&addr), len, ipstr, sizeof(ipstr),
-                     nullptr, 0, NI_NUMERICHOST)) {
-      return ipstr;
+    if (!getnameinfo(reinterpret_cast<struct sockaddr *>(&addr), len,
+                     ipstr.data(), static_cast<unsigned int>(ipstr.size()), nullptr, 0, NI_NUMERICHOST)) {
+      return ipstr.data();
     }
   }
 
   return std::string();
 }
 
-inline const char *find_content_type(const std::string &path) {
+inline const char *
+find_content_type(const std::string &path,
+                  const std::map<std::string, std::string> &user_data) {
   auto ext = file_extension(path);
+
+  auto it = user_data.find(ext);
+  if (it != user_data.end()) { return it->second.c_str(); }
+
   if (ext == "txt") {
     return "text/plain";
-  } else if (ext == "html") {
+  } else if (ext == "html" || ext == "htm") {
     return "text/html";
   } else if (ext == "css") {
     return "text/css";
@@ -1253,6 +1583,8 @@ inline const char *find_content_type(const std::string &path) {
     return "application/pdf";
   } else if (ext == "js") {
     return "application/javascript";
+  } else if (ext == "wasm") {
+    return "application/wasm";
   } else if (ext == "xml") {
     return "application/xml";
   } else if (ext == "xhtml") {
@@ -1263,19 +1595,25 @@ inline const char *find_content_type(const std::string &path) {
 
 inline const char *status_message(int status) {
   switch (status) {
+  case 100: return "Continue";
   case 200: return "OK";
+  case 202: return "Accepted";
+  case 204: return "No Content";
   case 206: return "Partial Content";
   case 301: return "Moved Permanently";
   case 302: return "Found";
   case 303: return "See Other";
   case 304: return "Not Modified";
   case 400: return "Bad Request";
+  case 401: return "Unauthorized";
   case 403: return "Forbidden";
   case 404: return "Not Found";
   case 413: return "Payload Too Large";
   case 414: return "Request-URI Too Long";
   case 415: return "Unsupported Media Type";
   case 416: return "Range Not Satisfiable";
+  case 417: return "Expectation Failed";
+  case 503: return "Service Unavailable";
 
   default:
   case 500: return "Internal Server Error";
@@ -1302,18 +1640,18 @@ inline bool compress(std::string &content) {
   if (ret != Z_OK) { return false; }
 
   strm.avail_in = content.size();
-  strm.next_in = const_cast<Bytef*>(reinterpret_cast<const Bytef*>(content.data()));
+  strm.next_in =
+      const_cast<Bytef *>(reinterpret_cast<const Bytef *>(content.data()));
 
   std::string compressed;
 
-  const auto bufsiz = 16384;
-  char buff[bufsiz];
+  std::array<char, 16384> buff{};
   do {
-    strm.avail_out = bufsiz;
-    strm.next_out = reinterpret_cast<Bytef*>(buff);
+    strm.avail_out = buff.size();
+    strm.next_out = reinterpret_cast<Bytef *>(buff.data());
     ret = deflate(&strm, Z_FINISH);
     assert(ret != Z_STREAM_ERROR);
-    compressed.append(buff, bufsiz - strm.avail_out);
+    compressed.append(buff.data(), buff.size() - strm.avail_out);
   } while (strm.avail_out == 0);
 
   assert(ret == Z_STREAM_END);
@@ -1347,13 +1685,12 @@ public:
     int ret = Z_OK;
 
     strm.avail_in = data_length;
-    strm.next_in = const_cast<Bytef*>(reinterpret_cast<const Bytef *>(data));
+    strm.next_in = const_cast<Bytef *>(reinterpret_cast<const Bytef *>(data));
 
-    const auto bufsiz = 16384;
-    char buff[bufsiz];
+    std::array<char, 16384> buff{};
     do {
-      strm.avail_out = bufsiz;
-      strm.next_out = reinterpret_cast<Bytef*>(buff);
+      strm.avail_out = buff.size();
+      strm.next_out = reinterpret_cast<Bytef *>(buff.data());
 
       ret = inflate(&strm, Z_NO_FLUSH);
       assert(ret != Z_STREAM_ERROR);
@@ -1363,10 +1700,12 @@ public:
       case Z_MEM_ERROR: inflateEnd(&strm); return false;
       }
 
-      if (!callback(buff, bufsiz - strm.avail_out)) { return false; }
+      if (!callback(buff.data(), buff.size() - strm.avail_out)) {
+        return false;
+      }
     } while (strm.avail_out == 0);
 
-    return ret == Z_STREAM_END;
+    return ret == Z_OK || ret == Z_STREAM_END;
   }
 
 private:
@@ -1397,18 +1736,35 @@ inline uint64_t get_header_value_uint64(const Headers &headers, const char *key,
 }
 
 inline bool read_headers(Stream &strm, Headers &headers) {
-  static std::regex re(R"((.+?):\s*(.+?)\s*\r\n)");
-
   const auto bufsiz = 2048;
   char buf[bufsiz];
-
-  stream_line_reader reader(strm, buf, bufsiz);
+  stream_line_reader line_reader(strm, buf, bufsiz);
 
   for (;;) {
-    if (!reader.getline()) { return false; }
-    if (!strcmp(reader.ptr(), "\r\n")) { break; }
+    if (!line_reader.getline()) { return false; }
+
+    // Check if the line ends with CRLF.
+    if (line_reader.end_with_crlf()) {
+      // Blank line indicates end of headers.
+      if (line_reader.size() == 2) { break; }
+    } else {
+      continue; // Skip invalid line.
+    }
+
+    // Skip trailing spaces and tabs.
+    auto end = line_reader.ptr() + line_reader.size() - 2;
+    while (line_reader.ptr() < end && (end[-1] == ' ' || end[-1] == '\t')) {
+      end--;
+    }
+
+    // Horizontal tab and ' ' are considered whitespace and are ignored when on
+    // the left or right side of the header value:
+    //  - https://stackoverflow.com/questions/50179659/
+    //  - https://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html
+    static const std::regex re(R"((.+?):[\t ]*(.+))");
+
     std::cmatch m;
-    if (std::regex_match(reader.ptr(), m, re)) {
+    if (std::regex_match(line_reader.ptr(), end, m, re)) {
       auto key = std::string(m[1]);
       auto val = std::string(m[2]);
       headers.emplace(key, val);
@@ -1418,12 +1774,8 @@ inline bool read_headers(Stream &strm, Headers &headers) {
   return true;
 }
 
-typedef std::function<bool(const char *data, size_t data_length)>
-    ContentReceiverCore;
-
 inline bool read_content_with_length(Stream &strm, uint64_t len,
-                                     Progress progress,
-                                     ContentReceiverCore out) {
+                                     Progress progress, ContentReceiver out) {
   char buf[CPPHTTPLIB_RECV_BUFSIZ];
 
   uint64_t r = 0;
@@ -1455,7 +1807,7 @@ inline void skip_content_with_length(Stream &strm, uint64_t len) {
   }
 }
 
-inline bool read_content_without_length(Stream &strm, ContentReceiverCore out) {
+inline bool read_content_without_length(Stream &strm, ContentReceiver out) {
   char buf[CPPHTTPLIB_RECV_BUFSIZ];
   for (;;) {
     auto n = strm.read(buf, CPPHTTPLIB_RECV_BUFSIZ);
@@ -1470,33 +1822,34 @@ inline bool read_content_without_length(Stream &strm, ContentReceiverCore out) {
   return true;
 }
 
-inline bool read_content_chunked(Stream &strm, ContentReceiverCore out) {
+inline bool read_content_chunked(Stream &strm, ContentReceiver out) {
   const auto bufsiz = 16;
   char buf[bufsiz];
 
-  stream_line_reader reader(strm, buf, bufsiz);
+  stream_line_reader line_reader(strm, buf, bufsiz);
 
-  if (!reader.getline()) { return false; }
+  if (!line_reader.getline()) { return false; }
 
-  auto chunk_len = std::stoi(reader.ptr(), 0, 16);
+  auto chunk_len = std::stoi(line_reader.ptr(), 0, 16);
 
   while (chunk_len > 0) {
     if (!read_content_with_length(strm, chunk_len, nullptr, out)) {
       return false;
     }
 
-    if (!reader.getline()) { return false; }
+    if (!line_reader.getline()) { return false; }
 
-    if (strcmp(reader.ptr(), "\r\n")) { break; }
+    if (strcmp(line_reader.ptr(), "\r\n")) { break; }
 
-    if (!reader.getline()) { return false; }
+    if (!line_reader.getline()) { return false; }
 
-    chunk_len = std::stoi(reader.ptr(), 0, 16);
+    chunk_len = std::stoi(line_reader.ptr(), 0, 16);
   }
 
   if (chunk_len == 0) {
     // Reader terminator after chunks
-    if (!reader.getline() || strcmp(reader.ptr(), "\r\n")) return false;
+    if (!line_reader.getline() || strcmp(line_reader.ptr(), "\r\n"))
+      return false;
   }
 
   return true;
@@ -1509,14 +1862,14 @@ inline bool is_chunked_transfer_encoding(const Headers &headers) {
 
 template <typename T>
 bool read_content(Stream &strm, T &x, size_t payload_max_length, int &status,
-                  Progress progress, ContentReceiverCore receiver) {
+                  Progress progress, ContentReceiver receiver) {
 
-  ContentReceiverCore out = [&](const char *buf, size_t n) {
+  ContentReceiver out = [&](const char *buf, size_t n) {
     return receiver(buf, n);
   };
 
 #ifdef CPPHTTPLIB_ZLIB_SUPPORT
-  detail::decompressor decompressor;
+  decompressor decompressor;
 
   if (!decompressor.is_valid()) {
     status = 500;
@@ -1586,39 +1939,47 @@ inline ssize_t write_content(Stream &strm, ContentProvider content_provider,
   size_t end_offset = offset + length;
   while (offset < end_offset) {
     ssize_t written_length = 0;
-    content_provider(
-        offset, end_offset - offset,
-        [&](const char *d, size_t l) {
-          offset += l;
-          written_length = strm.write(d, l);
-        },
-        [&](void) { written_length = -1; });
+
+    DataSink data_sink;
+    data_sink.write = [&](const char *d, size_t l) {
+      offset += l;
+      written_length = strm.write(d, l);
+    };
+    data_sink.done = [&](void) { written_length = -1; };
+    data_sink.is_writable = [&](void) { return strm.is_writable(); };
+
+    content_provider(offset, end_offset - offset, data_sink);
     if (written_length < 0) { return written_length; }
   }
   return static_cast<ssize_t>(offset - begin_offset);
 }
 
+template <typename T>
 inline ssize_t write_content_chunked(Stream &strm,
-                                     ContentProvider content_provider) {
+                                     ContentProvider content_provider,
+                                     T is_shutting_down) {
   size_t offset = 0;
   auto data_available = true;
   ssize_t total_written_length = 0;
-  while (data_available) {
+  while (data_available && !is_shutting_down()) {
     ssize_t written_length = 0;
-    content_provider(
-        offset, 0,
-        [&](const char *d, size_t l) {
-          data_available = l > 0;
-          offset += l;
-
-          // Emit chunked response header and footer for each chunk
-          auto chunk = from_i_to_hex(l) + "\r\n" + std::string(d, l) + "\r\n";
-          written_length = strm.write(chunk);
-        },
-        [&](void) {
-          data_available = false;
-          written_length = strm.write("0\r\n\r\n");
-        });
+
+    DataSink data_sink;
+    data_sink.write = [&](const char *d, size_t l) {
+      data_available = l > 0;
+      offset += l;
+
+      // Emit chunked response header and footer for each chunk
+      auto chunk = from_i_to_hex(l) + "\r\n" + std::string(d, l) + "\r\n";
+      written_length = strm.write(chunk);
+    };
+    data_sink.done = [&](void) {
+      data_available = false;
+      written_length = strm.write("0\r\n\r\n");
+    };
+    data_sink.is_writable = [&](void) { return strm.is_writable(); };
+
+    content_provider(offset, 0, data_sink);
 
     if (written_length < 0) { return written_length; }
     total_written_length += written_length;
@@ -1629,17 +1990,12 @@ inline ssize_t write_content_chunked(Stream &strm,
 template <typename T>
 inline bool redirect(T &cli, const Request &req, Response &res,
                      const std::string &path) {
-  Request new_req;
-  new_req.method = req.method;
+  Request new_req = req;
   new_req.path = path;
-  new_req.headers = req.headers;
-  new_req.body = req.body;
-  new_req.redirect_count = req.redirect_count - 1;
-  new_req.response_handler = req.response_handler;
-  new_req.content_receiver = req.content_receiver;
-  new_req.progress = req.progress;
+  new_req.redirect_count -= 1;
 
   Response new_res;
+
   auto ret = cli.send(new_req, new_res);
   if (ret) { res = new_res; }
   return ret;
@@ -1656,7 +2012,7 @@ inline std::string encode_url(const std::string &s) {
     case '\n': result += "%0A"; break;
     case '\'': result += "%27"; break;
     case ',': result += "%2C"; break;
-    case ':': result += "%3A"; break;
+    // case ':': result += "%3A"; break; // ok? probably...
     case ';': result += "%3B"; break;
     default:
       auto c = static_cast<uint8_t>(s[i]);
@@ -1716,11 +2072,11 @@ inline void parse_query_text(const std::string &s, Params &params) {
   split(&s[0], &s[s.size()], '&', [&](const char *b, const char *e) {
     std::string key;
     std::string val;
-    split(b, e, '=', [&](const char *b, const char *e) {
+    split(b, e, '=', [&](const char *b2, const char *e2) {
       if (key.empty()) {
-        key.assign(b, e);
+        key.assign(b2, e2);
       } else {
-        val.assign(b, e);
+        val.assign(b2, e2);
       }
     });
     params.emplace(key, decode_url(val));
@@ -1736,112 +2092,207 @@ inline bool parse_multipart_boundary(const std::string &content_type,
   return true;
 }
 
-inline bool parse_multipart_formdata(const std::string &boundary,
-                                     const std::string &body,
-                                     MultipartFiles &files) {
-  static std::string dash = "--";
-  static std::string crlf = "\r\n";
-
-  static std::regex re_content_type("Content-Type: (.*?)",
-                                    std::regex_constants::icase);
-
-  static std::regex re_content_disposition(
-      "Content-Disposition: form-data; name=\"(.*?)\"(?:; filename=\"(.*?)\")?",
-      std::regex_constants::icase);
-
-  auto dash_boundary = dash + boundary;
-
-  auto pos = body.find(dash_boundary);
-  if (pos != 0) { return false; }
-
-  pos += dash_boundary.size();
+inline bool parse_range_header(const std::string &s, Ranges &ranges) {
+  static auto re_first_range = std::regex(R"(bytes=(\d*-\d*(?:,\s*\d*-\d*)*))");
+  std::smatch m;
+  if (std::regex_match(s, m, re_first_range)) {
+    auto pos = m.position(1);
+    auto len = m.length(1);
+    bool all_valid_ranges = true;
+    split(&s[pos], &s[pos + len], ',', [&](const char *b, const char *e) {
+      if (!all_valid_ranges) return;
+      static auto re_another_range = std::regex(R"(\s*(\d*)-(\d*))");
+      std::cmatch cm;
+      if (std::regex_match(b, e, cm, re_another_range)) {
+        ssize_t first = -1;
+        if (!cm.str(1).empty()) {
+          first = static_cast<ssize_t>(std::stoll(cm.str(1)));
+        }
 
-  auto next_pos = body.find(crlf, pos);
-  if (next_pos == std::string::npos) { return false; }
+        ssize_t last = -1;
+        if (!cm.str(2).empty()) {
+          last = static_cast<ssize_t>(std::stoll(cm.str(2)));
+        }
 
-  pos = next_pos + crlf.size();
+        if (first != -1 && last != -1 && first > last) {
+          all_valid_ranges = false;
+          return;
+        }
+        ranges.emplace_back(std::make_pair(first, last));
+      }
+    });
+    return all_valid_ranges;
+  }
+  return false;
+}
 
-  while (pos < body.size()) {
-    next_pos = body.find(crlf, pos);
-    if (next_pos == std::string::npos) { return false; }
+class MultipartFormDataParser {
+public:
+  MultipartFormDataParser() {}
 
-    std::string name;
-    MultipartFile file;
+  void set_boundary(const std::string &boundary) { boundary_ = boundary; }
 
-    auto header = body.substr(pos, (next_pos - pos));
+  bool is_valid() const { return is_valid_; }
 
-    while (pos != next_pos) {
-      std::smatch m;
-      if (std::regex_match(header, m, re_content_type)) {
-        file.content_type = m[1];
-      } else if (std::regex_match(header, m, re_content_disposition)) {
-        name = m[1];
-        file.filename = m[2];
+  template <typename T, typename U>
+  bool parse(const char *buf, size_t n, T content_callback, U header_callback) {
+    static const std::regex re_content_type(R"(^Content-Type:\s*(.*?)\s*$)",
+                                            std::regex_constants::icase);
+
+    static const std::regex re_content_disposition(
+        "^Content-Disposition:\\s*form-data;\\s*name=\"(.*?)\"(?:;\\s*filename="
+        "\"(.*?)\")?\\s*$",
+        std::regex_constants::icase);
+
+    buf_.append(buf, n); // TODO: performance improvement
+
+    while (!buf_.empty()) {
+      switch (state_) {
+      case 0: { // Initial boundary
+        auto pattern = dash_ + boundary_ + crlf_;
+        if (pattern.size() > buf_.size()) { return true; }
+        auto pos = buf_.find(pattern);
+        if (pos != 0) {
+          is_done_ = true;
+          return false;
+        }
+        buf_.erase(0, pattern.size());
+        off_ += pattern.size();
+        state_ = 1;
+        break;
       }
+      case 1: { // New entry
+        clear_file_info();
+        state_ = 2;
+        break;
+      }
+      case 2: { // Headers
+        auto pos = buf_.find(crlf_);
+        while (pos != std::string::npos) {
+          // Empty line
+          if (pos == 0) {
+            if (!header_callback(file_)) {
+              is_valid_ = false;
+              is_done_ = false;
+              return false;
+            }
+            buf_.erase(0, crlf_.size());
+            off_ += crlf_.size();
+            state_ = 3;
+            break;
+          }
 
-      pos = next_pos + crlf.size();
-
-      next_pos = body.find(crlf, pos);
-      if (next_pos == std::string::npos) { return false; }
-
-      header = body.substr(pos, (next_pos - pos));
-    }
-
-    pos = next_pos + crlf.size();
+          auto header = buf_.substr(0, pos);
+          {
+            std::smatch m;
+            if (std::regex_match(header, m, re_content_type)) {
+              file_.content_type = m[1];
+            } else if (std::regex_match(header, m, re_content_disposition)) {
+              file_.name = m[1];
+              file_.filename = m[2];
+            }
+          }
 
-    next_pos = body.find(crlf + dash_boundary, pos);
+          buf_.erase(0, pos + crlf_.size());
+          off_ += pos + crlf_.size();
+          pos = buf_.find(crlf_);
+        }
+        break;
+      }
+      case 3: { // Body
+        {
+          auto pattern = crlf_ + dash_;
+          if (pattern.size() > buf_.size()) { return true; }
+
+          auto pos = buf_.find(pattern);
+          if (pos == std::string::npos) { pos = buf_.size(); }
+          if (!content_callback(buf_.data(), pos)) {
+            is_valid_ = false;
+            is_done_ = false;
+            return false;
+          }
 
-    if (next_pos == std::string::npos) { return false; }
+          off_ += pos;
+          buf_.erase(0, pos);
+        }
 
-    file.offset = pos;
-    file.length = next_pos - pos;
+        {
+          auto pattern = crlf_ + dash_ + boundary_;
+          if (pattern.size() > buf_.size()) { return true; }
+
+          auto pos = buf_.find(pattern);
+          if (pos != std::string::npos) {
+            if (!content_callback(buf_.data(), pos)) {
+              is_valid_ = false;
+              is_done_ = false;
+              return false;
+            }
 
-    pos = next_pos + crlf.size() + dash_boundary.size();
+            off_ += pos + pattern.size();
+            buf_.erase(0, pos + pattern.size());
+            state_ = 4;
+          } else {
+            if (!content_callback(buf_.data(), pattern.size())) {
+              is_valid_ = false;
+              is_done_ = false;
+              return false;
+            }
 
-    next_pos = body.find(crlf, pos);
-    if (next_pos == std::string::npos) { return false; }
+            off_ += pattern.size();
+            buf_.erase(0, pattern.size());
+          }
+        }
+        break;
+      }
+      case 4: { // Boundary
+        if (crlf_.size() > buf_.size()) { return true; }
+        if (buf_.find(crlf_) == 0) {
+          buf_.erase(0, crlf_.size());
+          off_ += crlf_.size();
+          state_ = 1;
+        } else {
+          auto pattern = dash_ + crlf_;
+          if (pattern.size() > buf_.size()) { return true; }
+          if (buf_.find(pattern) == 0) {
+            buf_.erase(0, pattern.size());
+            off_ += pattern.size();
+            is_valid_ = true;
+            state_ = 5;
+          } else {
+            is_done_ = true;
+            return true;
+          }
+        }
+        break;
+      }
+      case 5: { // Done
+        is_valid_ = false;
+        return false;
+      }
+      }
+    }
 
-    files.emplace(name, file);
+    return true;
+  }
 
-    pos = next_pos + crlf.size();
+private:
+  void clear_file_info() {
+    file_.name.clear();
+    file_.filename.clear();
+    file_.content_type.clear();
   }
 
-  return true;
-}
+  const std::string dash_ = "--";
+  const std::string crlf_ = "\r\n";
+  std::string boundary_;
 
-inline bool parse_range_header(const std::string &s, Ranges &ranges) {
-  try {
-    static auto re = std::regex(R"(bytes=(\d*-\d*(?:,\s*\d*-\d*)*))");
-    std::smatch m;
-    if (std::regex_match(s, m, re)) {
-      auto pos = m.position(1);
-      auto len = m.length(1);
-      detail::split(&s[pos], &s[pos + len], ',',
-                    [&](const char *b, const char *e) {
-                      static auto re = std::regex(R"(\s*(\d*)-(\d*))");
-                      std::cmatch m;
-                      if (std::regex_match(b, e, m, re)) {
-                        ssize_t first = -1;
-                        if (!m.str(1).empty()) {
-                          first = static_cast<ssize_t>(std::stoll(m.str(1)));
-                        }
-
-                        ssize_t last = -1;
-                        if (!m.str(2).empty()) {
-                          last = static_cast<ssize_t>(std::stoll(m.str(2)));
-                        }
-
-                        if (first != -1 && last != -1 && first > last) {
-                          throw std::runtime_error("invalid range error");
-                        }
-                        ranges.emplace_back(std::make_pair(first, last));
-                      }
-                    });
-      return true;
-    }
-    return false;
-  } catch (...) { return false; }
-}
+  std::string buf_;
+  size_t state_ = 0;
+  size_t is_valid_ = false;
+  size_t is_done_ = false;
+  size_t off_ = 0;
+  MultipartFormData file_;
+};
 
 inline std::string to_lower(const char *beg, const char *end) {
   std::string out;
@@ -1915,7 +2366,7 @@ bool process_multipart_ranges_data(const Request &req, Response &res,
       ctoken("\r\n");
     }
 
-    auto offsets = detail::get_range_offset_and_length(req, res.body.size(), i);
+    auto offsets = get_range_offset_and_length(req, res.body.size(), i);
     auto offset = offsets.first;
     auto length = offsets.second;
 
@@ -1978,8 +2429,7 @@ inline bool write_multipart_ranges_data(Stream &strm, const Request &req,
       [&](const std::string &token) { strm.write(token); },
       [&](const char *token) { strm.write(token); },
       [&](size_t offset, size_t length) {
-        return detail::write_content(strm, res.content_provider, offset,
-                                     length) >= 0;
+        return write_content(strm, res.content_provider, offset, length) >= 0;
       });
 }
 
@@ -1988,11 +2438,56 @@ get_range_offset_and_length(const Request &req, const Response &res,
                             size_t index) {
   auto r = req.ranges[index];
 
-  if (r.second == -1) { r.second = res.content_provider_resource_length - 1; }
+  if (r.second == -1) { r.second = res.content_length - 1; }
 
   return std::make_pair(r.first, r.second - r.first + 1);
 }
 
+inline bool expect_content(const Request &req) {
+  if (req.method == "POST" || req.method == "PUT" || req.method == "PATCH" ||
+      req.method == "PRI") {
+    return true;
+  }
+  // TODO: check if Content-Length is set
+  return false;
+}
+
+#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
+template <typename CTX, typename Init, typename Update, typename Final>
+inline std::string message_digest(const std::string &s, Init init,
+                                  Update update, Final final,
+                                  size_t digest_length) {
+  using namespace std;
+
+  std::vector<unsigned char> md(digest_length, 0);
+  CTX ctx;
+  init(&ctx);
+  update(&ctx, s.data(), s.size());
+  final(md.data(), &ctx);
+
+  stringstream ss;
+  for (auto c : md) {
+    ss << setfill('0') << setw(2) << hex << (unsigned int)c;
+  }
+  return ss.str();
+}
+
+inline std::string MD5(const std::string &s) {
+  return message_digest<MD5_CTX>(s, MD5_Init, MD5_Update, MD5_Final,
+                                 MD5_DIGEST_LENGTH);
+}
+
+inline std::string SHA_256(const std::string &s) {
+  return message_digest<SHA256_CTX>(s, SHA256_Init, SHA256_Update, SHA256_Final,
+                                    SHA256_DIGEST_LENGTH);
+}
+
+inline std::string SHA_512(const std::string &s) {
+  return message_digest<SHA512_CTX>(s, SHA512_Init, SHA512_Update, SHA512_Final,
+                                    SHA512_DIGEST_LENGTH);
+}
+#endif
+
 #ifdef _WIN32
 class WSInit {
 public:
@@ -2025,9 +2520,103 @@ inline std::pair<std::string, std::string> make_range_header(Ranges ranges) {
 
 inline std::pair<std::string, std::string>
 make_basic_authentication_header(const std::string &username,
-                                 const std::string &password) {
+                                 const std::string &password,
+                                 bool is_proxy = false) {
   auto field = "Basic " + detail::base64_encode(username + ":" + password);
-  return std::make_pair("Authorization", field);
+  auto key = is_proxy ? "Proxy-Authorization" : "Authorization";
+  return std::make_pair(key, field);
+}
+
+#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
+inline std::pair<std::string, std::string> make_digest_authentication_header(
+    const Request &req, const std::map<std::string, std::string> &auth,
+    size_t cnonce_count, const std::string &cnonce, const std::string &username,
+    const std::string &password, bool is_proxy = false) {
+  using namespace std;
+
+  string nc;
+  {
+    stringstream ss;
+    ss << setfill('0') << setw(8) << hex << cnonce_count;
+    nc = ss.str();
+  }
+
+  auto qop = auth.at("qop");
+  if (qop.find("auth-int") != std::string::npos) {
+    qop = "auth-int";
+  } else {
+    qop = "auth";
+  }
+
+  std::string algo = "MD5";
+  if (auth.find("algorithm") != auth.end()) { algo = auth.at("algorithm"); }
+
+  string response;
+  {
+    auto H = algo == "SHA-256"
+                 ? detail::SHA_256
+                 : algo == "SHA-512" ? detail::SHA_512 : detail::MD5;
+
+    auto A1 = username + ":" + auth.at("realm") + ":" + password;
+
+    auto A2 = req.method + ":" + req.path;
+    if (qop == "auth-int") { A2 += ":" + H(req.body); }
+
+    response = H(H(A1) + ":" + auth.at("nonce") + ":" + nc + ":" + cnonce +
+                 ":" + qop + ":" + H(A2));
+  }
+
+  auto field = "Digest username=\"hello\", realm=\"" + auth.at("realm") +
+               "\", nonce=\"" + auth.at("nonce") + "\", uri=\"" + req.path +
+               "\", algorithm=" + algo + ", qop=" + qop + ", nc=\"" + nc +
+               "\", cnonce=\"" + cnonce + "\", response=\"" + response + "\"";
+
+  auto key = is_proxy ? "Proxy-Authorization" : "Authorization";
+  return std::make_pair(key, field);
+}
+#endif
+
+inline bool parse_www_authenticate(const httplib::Response &res,
+                                   std::map<std::string, std::string> &auth,
+                                   bool is_proxy) {
+  auto auth_key = is_proxy ? "Proxy-Authenticate" : "WWW-Authenticate";
+  if (res.has_header(auth_key)) {
+    static auto re = std::regex(R"~((?:(?:,\s*)?(.+?)=(?:"(.*?)"|([^,]*))))~");
+    auto s = res.get_header_value(auth_key);
+    auto pos = s.find(' ');
+    if (pos != std::string::npos) {
+      auto type = s.substr(0, pos);
+      if (type == "Basic") {
+        return false;
+      } else if (type == "Digest") {
+        s = s.substr(pos + 1);
+        auto beg = std::sregex_iterator(s.begin(), s.end(), re);
+        for (auto i = beg; i != std::sregex_iterator(); ++i) {
+          auto m = *i;
+          auto key = s.substr(m.position(1), m.length(1));
+          auto val = m.length(2) > 0 ? s.substr(m.position(2), m.length(2))
+                                     : s.substr(m.position(3), m.length(3));
+          auth[key] = val;
+        }
+        return true;
+      }
+    }
+  }
+  return false;
+}
+
+// https://stackoverflow.com/questions/440133/how-do-i-create-a-random-alpha-numeric-string-in-c/440240#answer-440240
+inline std::string random_string(size_t length) {
+  auto randchar = []() -> char {
+    const char charset[] = "0123456789"
+                           "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+                           "abcdefghijklmnopqrstuvwxyz";
+    const size_t max_index = (sizeof(charset) - 1);
+    return charset[rand() % max_index];
+  };
+  std::string str(length, 0);
+  std::generate_n(str.begin(), length, randchar);
+  return str;
 }
 
 // Request implementation
@@ -2068,14 +2657,19 @@ inline size_t Request::get_param_value_count(const char *key) const {
   return std::distance(r.first, r.second);
 }
 
+inline bool Request::is_multipart_form_data() const {
+  const auto &content_type = get_header_value("Content-Type");
+  return !content_type.find("multipart/form-data");
+}
+
 inline bool Request::has_file(const char *key) const {
   return files.find(key) != files.end();
 }
 
-inline MultipartFile Request::get_file_value(const char *key) const {
+inline MultipartFormData Request::get_file_value(const char *key) const {
   auto it = files.find(key);
   if (it != files.end()) { return it->second; }
-  return MultipartFile();
+  return MultipartFormData();
 }
 
 // Response implementation
@@ -2119,40 +2713,47 @@ inline void Response::set_content(const std::string &s,
 }
 
 inline void Response::set_content_provider(
-    size_t length,
-    std::function<void(size_t offset, size_t length, DataSink sink)> provider,
+    size_t in_length,
+    std::function<void(size_t offset, size_t length, DataSink &sink)> provider,
     std::function<void()> resource_releaser) {
-  assert(length > 0);
-  content_provider_resource_length = length;
-  content_provider = [provider](size_t offset, size_t length, DataSink sink,
-                                Done) { provider(offset, length, sink); };
+  assert(in_length > 0);
+  content_length = in_length;
+  content_provider = [provider](size_t offset, size_t length, DataSink &sink) {
+    provider(offset, length, sink);
+  };
   content_provider_resource_releaser = resource_releaser;
 }
 
 inline void Response::set_chunked_content_provider(
-    std::function<void(size_t offset, DataSink sink, Done done)> provider,
+    std::function<void(size_t offset, DataSink &sink)> provider,
     std::function<void()> resource_releaser) {
-  content_provider_resource_length = 0;
-  content_provider = [provider](size_t offset, size_t, DataSink sink,
-                                Done done) { provider(offset, sink, done); };
+  content_length = 0;
+  content_provider = [provider](size_t offset, size_t, DataSink &sink) {
+    provider(offset, sink);
+  };
   content_provider_resource_releaser = resource_releaser;
 }
 
 // Rstream implementation
+inline int Stream::write(const char *ptr) { return write(ptr, strlen(ptr)); }
+
+inline int Stream::write(const std::string &s) {
+  return write(s.data(), s.size());
+}
+
 template <typename... Args>
 inline int Stream::write_format(const char *fmt, const Args &... args) {
-  const auto bufsiz = 2048;
-  char buf[bufsiz];
+  std::array<char, 2048> buf;
 
 #if defined(_MSC_VER) && _MSC_VER < 1900
-  auto n = _snprintf_s(buf, bufsiz, bufsiz - 1, fmt, args...);
+  auto n = _snprintf_s(buf, bufsiz, buf.size() - 1, fmt, args...);
 #else
-  auto n = snprintf(buf, bufsiz - 1, fmt, args...);
+  auto n = snprintf(buf.data(), buf.size() - 1, fmt, args...);
 #endif
   if (n <= 0) { return n; }
 
-  if (n >= bufsiz - 1) {
-    std::vector<char> glowable_buf(bufsiz);
+  if (n >= static_cast<int>(buf.size()) - 1) {
+    std::vector<char> glowable_buf(buf.size());
 
     while (n >= static_cast<int>(glowable_buf.size() - 1)) {
       glowable_buf.resize(glowable_buf.size() * 2);
@@ -2165,33 +2766,36 @@ inline int Stream::write_format(const char *fmt, const Args &... args) {
     }
     return write(&glowable_buf[0], n);
   } else {
-    return write(buf, n);
+    return write(buf.data(), n);
   }
 }
 
+namespace detail {
+
 // Socket stream implementation
-inline SocketStream::SocketStream(socket_t sock) : sock_(sock) {}
+inline SocketStream::SocketStream(socket_t sock, time_t read_timeout_sec,
+                                  time_t read_timeout_usec)
+    : sock_(sock), read_timeout_sec_(read_timeout_sec),
+      read_timeout_usec_(read_timeout_usec) {}
 
 inline SocketStream::~SocketStream() {}
 
-inline int SocketStream::read(char *ptr, size_t size) {
-  if (detail::select_read(sock_, CPPHTTPLIB_READ_TIMEOUT_SECOND,
-                          CPPHTTPLIB_READ_TIMEOUT_USECOND) > 0) {
-    return recv(sock_, ptr, static_cast<int>(size), 0);
-  }
-  return -1;
+inline bool SocketStream::is_readable() const {
+  return detail::select_read(sock_, read_timeout_sec_, read_timeout_usec_) > 0;
 }
 
-inline int SocketStream::write(const char *ptr, size_t size) {
-  return send(sock_, ptr, static_cast<int>(size), 0);
+inline bool SocketStream::is_writable() const {
+  return detail::select_write(sock_, 0, 0) > 0;
 }
 
-inline int SocketStream::write(const char *ptr) {
-  return write(ptr, strlen(ptr));
+inline int SocketStream::read(char *ptr, size_t size) {
+  if (is_readable()) { return recv(sock_, ptr, static_cast<int>(size), 0); }
+  return -1;
 }
 
-inline int SocketStream::write(const std::string &s) {
-  return write(s.data(), s.size());
+inline int SocketStream::write(const char *ptr, size_t size) {
+  if (is_writable()) { return send(sock_, ptr, static_cast<int>(size), 0); }
+  return -1;
 }
 
 inline std::string SocketStream::get_remote_addr() const {
@@ -2199,12 +2803,18 @@ inline std::string SocketStream::get_remote_addr() const {
 }
 
 // Buffer stream implementation
+inline bool BufferStream::is_readable() const { return true; }
+
+inline bool BufferStream::is_writable() const { return true; }
+
 inline int BufferStream::read(char *ptr, size_t size) {
 #if defined(_MSC_VER) && _MSC_VER < 1900
-  return static_cast<int>(buffer._Copy_s(ptr, size, size));
+  int len_read = static_cast<int>(buffer._Copy_s(ptr, size, size, position));
 #else
-  return static_cast<int>(buffer.copy(ptr, size));
+  int len_read = static_cast<int>(buffer.copy(ptr, size, position));
 #endif
+  position += len_read;
+  return len_read;
 }
 
 inline int BufferStream::write(const char *ptr, size_t size) {
@@ -2212,33 +2822,23 @@ inline int BufferStream::write(const char *ptr, size_t size) {
   return static_cast<int>(size);
 }
 
-inline int BufferStream::write(const char *ptr) {
-  return write(ptr, strlen(ptr));
-}
-
-inline int BufferStream::write(const std::string &s) {
-  return write(s.data(), s.size());
-}
-
 inline std::string BufferStream::get_remote_addr() const { return ""; }
 
 inline const std::string &BufferStream::get_buffer() const { return buffer; }
 
+} // namespace detail
+
 // HTTP server implementation
 inline Server::Server()
     : keep_alive_max_count_(CPPHTTPLIB_KEEPALIVE_MAX_COUNT),
+      read_timeout_sec_(CPPHTTPLIB_READ_TIMEOUT_SECOND),
+      read_timeout_usec_(CPPHTTPLIB_READ_TIMEOUT_USECOND),
       payload_max_length_(CPPHTTPLIB_PAYLOAD_MAX_LENGTH), is_running_(false),
       svr_sock_(INVALID_SOCKET) {
 #ifndef _WIN32
   signal(SIGPIPE, SIG_IGN);
 #endif
-  new_task_queue = [] {
-#if CPPHTTPLIB_THREAD_POOL_COUNT > 0
-    return new ThreadPool(CPPHTTPLIB_THREAD_POOL_COUNT);
-#else
-    return new Threads();
-#endif
-  };
+  new_task_queue = [] { return new ThreadPool(CPPHTTPLIB_THREAD_POOL_COUNT); };
 }
 
 inline Server::~Server() {}
@@ -2253,16 +2853,37 @@ inline Server &Server::Post(const char *pattern, Handler handler) {
   return *this;
 }
 
+inline Server &Server::Post(const char *pattern,
+                            HandlerWithContentReader handler) {
+  post_handlers_for_content_reader_.push_back(
+      std::make_pair(std::regex(pattern), handler));
+  return *this;
+}
+
 inline Server &Server::Put(const char *pattern, Handler handler) {
   put_handlers_.push_back(std::make_pair(std::regex(pattern), handler));
   return *this;
 }
 
+inline Server &Server::Put(const char *pattern,
+                           HandlerWithContentReader handler) {
+  put_handlers_for_content_reader_.push_back(
+      std::make_pair(std::regex(pattern), handler));
+  return *this;
+}
+
 inline Server &Server::Patch(const char *pattern, Handler handler) {
   patch_handlers_.push_back(std::make_pair(std::regex(pattern), handler));
   return *this;
 }
 
+inline Server &Server::Patch(const char *pattern,
+                             HandlerWithContentReader handler) {
+  patch_handlers_for_content_reader_.push_back(
+      std::make_pair(std::regex(pattern), handler));
+  return *this;
+}
+
 inline Server &Server::Delete(const char *pattern, Handler handler) {
   delete_handlers_.push_back(std::make_pair(std::regex(pattern), handler));
   return *this;
@@ -2273,32 +2894,68 @@ inline Server &Server::Options(const char *pattern, Handler handler) {
   return *this;
 }
 
-inline bool Server::set_base_dir(const char *path) {
-  if (detail::is_dir(path)) {
-    base_dir_ = path;
-    return true;
+inline bool Server::set_base_dir(const char *dir, const char *mount_point) {
+  return set_mount_point(mount_point, dir);
+}
+
+inline bool Server::set_mount_point(const char *mount_point, const char *dir) {
+  if (detail::is_dir(dir)) {
+    std::string mnt = mount_point ? mount_point : "/";
+    if (!mnt.empty() && mnt[0] == '/') {
+      base_dirs_.emplace_back(mnt, dir);
+      return true;
+    }
+  }
+  return false;
+}
+
+inline bool Server::remove_mount_point(const char *mount_point) {
+  for (auto it = base_dirs_.begin(); it != base_dirs_.end(); ++it) {
+    if (it->first == mount_point) {
+      base_dirs_.erase(it);
+      return true;
+    }
   }
   return false;
 }
 
+inline void Server::set_file_extension_and_mimetype_mapping(const char *ext,
+                                                            const char *mime) {
+  file_extension_and_mimetype_map_[ext] = mime;
+}
+
 inline void Server::set_file_request_handler(Handler handler) {
-  file_request_handler_ = handler;
+  file_request_handler_ = std::move(handler);
 }
 
 inline void Server::set_error_handler(Handler handler) {
-  error_handler_ = handler;
+  error_handler_ = std::move(handler);
 }
 
-inline void Server::set_logger(Logger logger) { logger_ = logger; }
+inline void Server::set_logger(Logger logger) { logger_ = std::move(logger); }
+
+inline void
+Server::set_expect_100_continue_handler(Expect100ContinueHandler handler) {
+  expect_100_continue_handler_ = std::move(handler);
+}
 
 inline void Server::set_keep_alive_max_count(size_t count) {
   keep_alive_max_count_ = count;
 }
 
+inline void Server::set_read_timeout(time_t sec, time_t usec) {
+  read_timeout_sec_ = sec;
+  read_timeout_usec_ = usec;
+}
+
 inline void Server::set_payload_max_length(size_t length) {
   payload_max_length_ = length;
 }
 
+inline bool Server::bind_to_port(const char *host, int port, int socket_flags) {
+  if (bind_internal(host, port, socket_flags) < 0) return false;
+  return true;
+}
 inline int Server::bind_to_any_port(const char *host, int socket_flags) {
   return bind_internal(host, 0, socket_flags);
 }
@@ -2306,8 +2963,7 @@ inline int Server::bind_to_any_port(const char *host, int socket_flags) {
 inline bool Server::listen_after_bind() { return listen_internal(); }
 
 inline bool Server::listen(const char *host, int port, int socket_flags) {
-  if (bind_internal(host, port, socket_flags) < 0) return false;
-  return listen_internal();
+  return bind_to_port(host, port, socket_flags) && listen_internal();
 }
 
 inline bool Server::is_running() const { return is_running_; }
@@ -2322,8 +2978,9 @@ inline void Server::stop() {
 }
 
 inline bool Server::parse_request_line(const char *s, Request &req) {
-  static std::regex re("(GET|HEAD|POST|PUT|DELETE|CONNECT|OPTIONS|TRACE|PATCH|PRI) "
-                       "(([^?]+)(?:\\?(.+?))?) (HTTP/1\\.[01])\r\n");
+  const static std::regex re(
+      "(GET|HEAD|POST|PUT|DELETE|CONNECT|OPTIONS|TRACE|PATCH|PRI) "
+      "(([^?]+)(?:\\?(.*?))?) (HTTP/1\\.[01])\r\n");
 
   std::cmatch m;
   if (std::regex_match(s, m, re)) {
@@ -2348,9 +3005,11 @@ inline bool Server::write_response(Stream &strm, bool last_connection,
 
   if (400 <= res.status && error_handler_) { error_handler_(req, res); }
 
+  detail::BufferStream bstrm;
+
   // Response line
-  if (!strm.write_format("HTTP/1.1 %d %s\r\n", res.status,
-                         detail::status_message(res.status))) {
+  if (!bstrm.write_format("HTTP/1.1 %d %s\r\n", res.status,
+                          detail::status_message(res.status))) {
     return false;
   }
 
@@ -2363,11 +3022,12 @@ inline bool Server::write_response(Stream &strm, bool last_connection,
     res.set_header("Connection", "Keep-Alive");
   }
 
-  if (!res.has_header("Content-Type")) {
+  if (!res.has_header("Content-Type") &&
+      (!res.body.empty() || res.content_length > 0)) {
     res.set_header("Content-Type", "text/plain");
   }
 
-  if (!res.has_header("Accept-Ranges")) {
+  if (!res.has_header("Accept-Ranges") && req.method == "HEAD") {
     res.set_header("Accept-Ranges", "bytes");
   }
 
@@ -2388,17 +3048,17 @@ inline bool Server::write_response(Stream &strm, bool last_connection,
   }
 
   if (res.body.empty()) {
-    if (res.content_provider_resource_length > 0) {
+    if (res.content_length > 0) {
       size_t length = 0;
       if (req.ranges.empty()) {
-        length = res.content_provider_resource_length;
+        length = res.content_length;
       } else if (req.ranges.size() == 1) {
-        auto offsets = detail::get_range_offset_and_length(
-            req, res.content_provider_resource_length, 0);
+        auto offsets =
+            detail::get_range_offset_and_length(req, res.content_length, 0);
         auto offset = offsets.first;
         length = offsets.second;
         auto content_range = detail::make_content_range_header_field(
-            offset, length, res.content_provider_resource_length);
+            offset, length, res.content_length);
         res.set_header("Content-Range", content_range);
       } else {
         length = detail::get_multipart_ranges_data_length(req, res, boundary,
@@ -2430,7 +3090,7 @@ inline bool Server::write_response(Stream &strm, bool last_connection,
     }
 
 #ifdef CPPHTTPLIB_ZLIB_SUPPORT
-    // TODO: 'Accpet-Encoding' has gzip, not gzip;q=0
+    // TODO: 'Accept-Encoding' has gzip, not gzip;q=0
     const auto &encodings = req.get_header_value("Accept-Encoding");
     if (encodings.find("gzip") != std::string::npos &&
         detail::can_compress(res.get_header_value("Content-Type"))) {
@@ -2444,7 +3104,11 @@ inline bool Server::write_response(Stream &strm, bool last_connection,
     res.set_header("Content-Length", length);
   }
 
-  if (!detail::write_headers(strm, res, Headers())) { return false; }
+  if (!detail::write_headers(bstrm, res, Headers())) { return false; }
+
+  // Flush buffer
+  auto &data = bstrm.get_buffer();
+  strm.write(data.data(), data.size());
 
   // Body
   if (req.method != "HEAD") {
@@ -2468,15 +3132,15 @@ inline bool
 Server::write_content_with_provider(Stream &strm, const Request &req,
                                     Response &res, const std::string &boundary,
                                     const std::string &content_type) {
-  if (res.content_provider_resource_length) {
+  if (res.content_length) {
     if (req.ranges.empty()) {
       if (detail::write_content(strm, res.content_provider, 0,
-                                res.content_provider_resource_length) < 0) {
+                                res.content_length) < 0) {
         return false;
       }
     } else if (req.ranges.size() == 1) {
-      auto offsets = detail::get_range_offset_and_length(
-          req, res.content_provider_resource_length, 0);
+      auto offsets =
+          detail::get_range_offset_and_length(req, res.content_length, 0);
       auto offset = offsets.first;
       auto length = offsets.second;
       if (detail::write_content(strm, res.content_provider, offset, length) <
@@ -2490,29 +3154,123 @@ Server::write_content_with_provider(Stream &strm, const Request &req,
       }
     }
   } else {
-    if (detail::write_content_chunked(strm, res.content_provider) < 0) {
+    auto is_shutting_down = [this]() {
+      return this->svr_sock_ == INVALID_SOCKET;
+    };
+    if (detail::write_content_chunked(strm, res.content_provider,
+                                      is_shutting_down) < 0) {
       return false;
     }
   }
   return true;
 }
 
-inline bool Server::handle_file_request(Request &req, Response &res) {
-  if (!base_dir_.empty() && detail::is_valid_path(req.path)) {
-    std::string path = base_dir_ + req.path;
+inline bool Server::read_content(Stream &strm, bool last_connection,
+                                 Request &req, Response &res) {
+  MultipartFormDataMap::iterator cur;
+  auto ret = read_content_core(
+      strm, last_connection, req, res,
+      // Regular
+      [&](const char *buf, size_t n) {
+        if (req.body.size() + n > req.body.max_size()) { return false; }
+        req.body.append(buf, n);
+        return true;
+      },
+      // Multipart
+      [&](const MultipartFormData &file) {
+        cur = req.files.emplace(file.name, file);
+        return true;
+      },
+      [&](const char *buf, size_t n) {
+        auto &content = cur->second.content;
+        if (content.size() + n > content.max_size()) { return false; }
+        content.append(buf, n);
+        return true;
+      });
 
-    if (!path.empty() && path.back() == '/') { path += "index.html"; }
+  const auto &content_type = req.get_header_value("Content-Type");
+  if (!content_type.find("application/x-www-form-urlencoded")) {
+    detail::parse_query_text(req.body, req.params);
+  }
 
-    if (detail::is_file(path)) {
-      detail::read_file(path, res.body);
-      auto type = detail::find_content_type(path);
-      if (type) { res.set_header("Content-Type", type); }
-      res.status = 200;
-      if (file_request_handler_) { file_request_handler_(req, res); }
-      return true;
+  return ret;
+}
+
+inline bool Server::read_content_with_content_receiver(
+    Stream &strm, bool last_connection, Request &req, Response &res,
+    ContentReceiver receiver, MultipartContentHeader multipart_header,
+    ContentReceiver multipart_receiver) {
+  return read_content_core(strm, last_connection, req, res, receiver,
+                           multipart_header, multipart_receiver);
+}
+
+inline bool Server::read_content_core(Stream &strm, bool last_connection,
+                                      Request &req, Response &res,
+                                      ContentReceiver receiver,
+                                      MultipartContentHeader mulitpart_header,
+                                      ContentReceiver multipart_receiver) {
+  detail::MultipartFormDataParser multipart_form_data_parser;
+  ContentReceiver out;
+
+  if (req.is_multipart_form_data()) {
+    const auto &content_type = req.get_header_value("Content-Type");
+    std::string boundary;
+    if (!detail::parse_multipart_boundary(content_type, boundary)) {
+      res.status = 400;
+      return write_response(strm, last_connection, req, res);
     }
+
+    multipart_form_data_parser.set_boundary(boundary);
+    out = [&](const char *buf, size_t n) {
+      return multipart_form_data_parser.parse(buf, n, multipart_receiver,
+                                              mulitpart_header);
+    };
+  } else {
+    out = receiver;
+  }
+
+  if (!detail::read_content(strm, req, payload_max_length_, res.status,
+                            Progress(), out)) {
+    return write_response(strm, last_connection, req, res);
   }
 
+  if (req.is_multipart_form_data()) {
+    if (!multipart_form_data_parser.is_valid()) {
+      res.status = 400;
+      return write_response(strm, last_connection, req, res);
+    }
+  }
+
+  return true;
+}
+
+inline bool Server::handle_file_request(Request &req, Response &res,
+                                        bool head) {
+  for (const auto &kv : base_dirs_) {
+    const auto &mount_point = kv.first;
+    const auto &base_dir = kv.second;
+
+    // Prefix match
+    if (!req.path.find(mount_point)) {
+      std::string sub_path = "/" + req.path.substr(mount_point.size());
+      if (detail::is_valid_path(sub_path)) {
+        auto path = base_dir + sub_path;
+        if (path.back() == '/') { path += "index.html"; }
+
+        if (detail::is_file(path)) {
+          detail::read_file(path, res.body);
+          auto type =
+              detail::find_content_type(path, file_extension_and_mimetype_map_);
+          if (type) { res.set_header("Content-Type", type); }
+          res.status = 200;
+          if (!head && file_request_handler_) {
+            file_request_handler_(req, res);
+          }
+          return true;
+        }
+      }
+    }
+  }
   return false;
 }
 
@@ -2605,9 +3363,51 @@ inline bool Server::listen_internal() {
   return ret;
 }
 
-inline bool Server::routing(Request &req, Response &res) {
-  if (req.method == "GET" && handle_file_request(req, res)) { return true; }
+inline bool Server::routing(Request &req, Response &res, Stream &strm,
+                            bool last_connection) {
+  // File handler
+  bool is_head_request = req.method == "HEAD";
+  if ((req.method == "GET" || is_head_request) &&
+      handle_file_request(req, res, is_head_request)) {
+    return true;
+  }
+
+  if (detail::expect_content(req)) {
+    // Content reader handler
+    {
+      ContentReader reader(
+          [&](ContentReceiver receiver) {
+            return read_content_with_content_receiver(
+                strm, last_connection, req, res, receiver, nullptr, nullptr);
+          },
+          [&](MultipartContentHeader header, ContentReceiver receiver) {
+            return read_content_with_content_receiver(
+                strm, last_connection, req, res, nullptr, header, receiver);
+          });
+
+      if (req.method == "POST") {
+        if (dispatch_request_for_content_reader(
+                req, res, reader, post_handlers_for_content_reader_)) {
+          return true;
+        }
+      } else if (req.method == "PUT") {
+        if (dispatch_request_for_content_reader(
+                req, res, reader, put_handlers_for_content_reader_)) {
+          return true;
+        }
+      } else if (req.method == "PATCH") {
+        if (dispatch_request_for_content_reader(
+                req, res, reader, patch_handlers_for_content_reader_)) {
+          return true;
+        }
+      }
+    }
 
+    // Read content into `req.body`
+    if (!read_content(strm, last_connection, req, res)) { return false; }
+  }
+
+  // Regular handler
   if (req.method == "GET" || req.method == "HEAD") {
     return dispatch_request(req, res, get_handlers_);
   } else if (req.method == "POST") {
@@ -2640,17 +3440,31 @@ inline bool Server::dispatch_request(Request &req, Response &res,
   return false;
 }
 
+inline bool Server::dispatch_request_for_content_reader(
+    Request &req, Response &res, ContentReader content_reader,
+    HandlersForContentReader &handlers) {
+  for (const auto &x : handlers) {
+    const auto &pattern = x.first;
+    const auto &handler = x.second;
+
+    if (std::regex_match(req.path, req.matches, pattern)) {
+      handler(req, res, content_reader);
+      return true;
+    }
+  }
+  return false;
+}
+
 inline bool
 Server::process_request(Stream &strm, bool last_connection,
                         bool &connection_close,
-                        std::function<void(Request &)> setup_request) {
-  const auto bufsiz = 2048;
-  char buf[bufsiz];
+                        const std::function<void(Request &)> &setup_request) {
+  std::array<char, 2048> buf{};
 
-  detail::stream_line_reader reader(strm, buf, bufsiz);
+  detail::stream_line_reader line_reader(strm, buf.data(), buf.size());
 
   // Connection has been closed on client
-  if (!reader.getline()) { return false; }
+  if (!line_reader.getline()) { return false; }
 
   Request req;
   Response res;
@@ -2658,7 +3472,7 @@ Server::process_request(Stream &strm, bool last_connection,
   res.version = "HTTP/1.1";
 
   // Check if the request URI doesn't exceed the limit
-  if (reader.size() > CPPHTTPLIB_REQUEST_URI_MAX_LENGTH) {
+  if (line_reader.size() > CPPHTTPLIB_REQUEST_URI_MAX_LENGTH) {
     Headers dummy;
     detail::read_headers(strm, dummy);
     res.status = 414;
@@ -2666,7 +3480,7 @@ Server::process_request(Stream &strm, bool last_connection,
   }
 
   // Request line and headers
-  if (!parse_request_line(reader.ptr(), req) ||
+  if (!parse_request_line(line_reader.ptr(), req) ||
       !detail::read_headers(strm, req.headers)) {
     res.status = 400;
     return write_response(strm, last_connection, req, res);
@@ -2683,33 +3497,6 @@ Server::process_request(Stream &strm, bool last_connection,
 
   req.set_header("REMOTE_ADDR", strm.get_remote_addr());
 
-  // Body
-  if (req.method == "POST" || req.method == "PUT" || req.method == "PATCH" || req.method == "PRI") {
-    if (!detail::read_content(strm, req, payload_max_length_, res.status,
-                              Progress(), [&](const char *buf, size_t n) {
-                                if (req.body.size() + n > req.body.max_size()) {
-                                  return false;
-                                }
-                                req.body.append(buf, n);
-                                return true;
-                              })) {
-      return write_response(strm, last_connection, req, res);
-    }
-
-    const auto &content_type = req.get_header_value("Content-Type");
-
-    if (!content_type.find("application/x-www-form-urlencoded")) {
-      detail::parse_query_text(req.body, req.params);
-    } else if (!content_type.find("multipart/form-data")) {
-      std::string boundary;
-      if (!detail::parse_multipart_boundary(content_type, boundary) ||
-          !detail::parse_multipart_formdata(boundary, req.body, req.files)) {
-        res.status = 400;
-        return write_response(strm, last_connection, req, res);
-      }
-    }
-  }
-
   if (req.has_header("Range")) {
     const auto &range_header_value = req.get_header_value("Range");
     if (!detail::parse_range_header(range_header_value, req.ranges)) {
@@ -2719,7 +3506,23 @@ Server::process_request(Stream &strm, bool last_connection,
 
   if (setup_request) { setup_request(req); }
 
-  if (routing(req, res)) {
+  if (req.get_header_value("Expect") == "100-continue") {
+    auto status = 100;
+    if (expect_100_continue_handler_) {
+      status = expect_100_continue_handler_(req, res);
+    }
+    switch (status) {
+    case 100:
+    case 417:
+      strm.write_format("HTTP/1.1 %d %s\r\n\r\n", status,
+                        detail::status_message(status));
+      break;
+    default: return write_response(strm, last_connection, req, res);
+    }
+  }
+
+  // Rounting
+  if (routing(req, res, strm, last_connection)) {
     if (res.status == -1) { res.status = req.ranges.empty() ? 200 : 206; }
   } else {
     if (res.status == -1) { res.status = 404; }
@@ -2732,7 +3535,7 @@ inline bool Server::is_valid() const { return true; }
 
 inline bool Server::process_and_close_socket(socket_t sock) {
   return detail::process_and_close_socket(
-      false, sock, keep_alive_max_count_,
+      false, sock, keep_alive_max_count_, read_timeout_sec_, read_timeout_usec_,
       [this](Stream &strm, bool last_connection, bool &connection_close) {
         return process_request(strm, last_connection, connection_close,
                                nullptr);
@@ -2740,47 +3543,37 @@ inline bool Server::process_and_close_socket(socket_t sock) {
 }
 
 // HTTP client implementation
-inline Client::Client(const char *host, int port, time_t timeout_sec)
-    : host_(host), port_(port), timeout_sec_(timeout_sec),
+inline Client::Client(const std::string &host, int port,
+                      const std::string &client_cert_path,
+                      const std::string &client_key_path)
+    : host_(host), port_(port),
       host_and_port_(host_ + ":" + std::to_string(port_)),
-      keep_alive_max_count_(CPPHTTPLIB_KEEPALIVE_MAX_COUNT),
-      follow_location_(false) {}
+      client_cert_path_(client_cert_path), client_key_path_(client_key_path) {}
 
 inline Client::~Client() {}
 
 inline bool Client::is_valid() const { return true; }
 
 inline socket_t Client::create_client_socket() const {
-  return detail::create_socket(
-      host_.c_str(), port_, [=](socket_t sock, struct addrinfo &ai) -> bool {
-        detail::set_nonblocking(sock, true);
-
-        auto ret = connect(sock, ai.ai_addr, static_cast<int>(ai.ai_addrlen));
-        if (ret < 0) {
-          if (detail::is_connection_error() ||
-              !detail::wait_until_socket_is_ready(sock, timeout_sec_, 0)) {
-            detail::close_socket(sock);
-            return false;
-          }
-        }
-
-        detail::set_nonblocking(sock, false);
-        return true;
-      });
+  if (!proxy_host_.empty()) {
+    return detail::create_client_socket(proxy_host_.c_str(), proxy_port_,
+                                        timeout_sec_, interface_);
+  }
+  return detail::create_client_socket(host_.c_str(), port_, timeout_sec_,
+                                      interface_);
 }
 
 inline bool Client::read_response_line(Stream &strm, Response &res) {
-  const auto bufsiz = 2048;
-  char buf[bufsiz];
+  std::array<char, 2048> buf;
 
-  detail::stream_line_reader reader(strm, buf, bufsiz);
+  detail::stream_line_reader line_reader(strm, buf.data(), buf.size());
 
-  if (!reader.getline()) { return false; }
+  if (!line_reader.getline()) { return false; }
 
   const static std::regex re("(HTTP/1\\.[01]) (\\d+?) .*\r\n");
 
   std::cmatch m;
-  if (std::regex_match(reader.ptr(), m, re)) {
+  if (std::regex_match(line_reader.ptr(), m, re)) {
     res.version = std::string(m[1]);
     res.status = std::stoi(std::string(m[2]));
   }
@@ -2789,22 +3582,21 @@ inline bool Client::read_response_line(Stream &strm, Response &res) {
 }
 
 inline bool Client::send(const Request &req, Response &res) {
-  if (req.path.empty()) { return false; }
-
   auto sock = create_client_socket();
   if (sock == INVALID_SOCKET) { return false; }
 
-  auto ret = process_and_close_socket(
-      sock, 1, [&](Stream &strm, bool last_connection, bool &connection_close) {
-        return process_request(strm, req, res, last_connection,
-                               connection_close);
-      });
-
-  if (ret && follow_location_ && (300 < res.status && res.status < 400)) {
-    ret = redirect(req, res);
+#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
+  if (is_ssl() && !proxy_host_.empty()) {
+    bool error;
+    if (!connect(sock, res, error)) { return error; }
   }
+#endif
 
-  return ret;
+  return process_and_close_socket(
+      sock, 1, [&](Stream &strm, bool last_connection, bool &connection_close) {
+        return handle_request(strm, req, res, last_connection,
+                              connection_close);
+      });
 }
 
 inline bool Client::send(const std::vector<Request> &requests,
@@ -2814,32 +3606,136 @@ inline bool Client::send(const std::vector<Request> &requests,
     auto sock = create_client_socket();
     if (sock == INVALID_SOCKET) { return false; }
 
-    if (!process_and_close_socket(
-            sock, requests.size() - i,
-            [&](Stream &strm, bool last_connection, bool &connection_close) -> bool {
-              auto &req = requests[i];
-              auto res = Response();
-              i++;
+#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
+    if (is_ssl() && !proxy_host_.empty()) {
+      Response res;
+      bool error;
+      if (!connect(sock, res, error)) { return false; }
+    }
+#endif
+
+    if (!process_and_close_socket(sock, requests.size() - i,
+                                  [&](Stream &strm, bool last_connection,
+                                      bool &connection_close) -> bool {
+                                    auto &req = requests[i++];
+                                    auto res = Response();
+                                    auto ret = handle_request(strm, req, res,
+                                                              last_connection,
+                                                              connection_close);
+                                    if (ret) {
+                                      responses.emplace_back(std::move(res));
+                                    }
+                                    return ret;
+                                  })) {
+      return false;
+    }
+  }
 
-              if (req.path.empty()) { return false; }
-              auto ret = process_request(strm, req, res, last_connection,
-                                         connection_close);
+  return true;
+}
+
+inline bool Client::handle_request(Stream &strm, const Request &req,
+                                   Response &res, bool last_connection,
+                                   bool &connection_close) {
+  if (req.path.empty()) { return false; }
+
+  bool ret;
+
+  if (!is_ssl() && !proxy_host_.empty()) {
+    auto req2 = req;
+    req2.path = "http://" + host_and_port_ + req.path;
+    ret = process_request(strm, req2, res, last_connection, connection_close);
+  } else {
+    ret = process_request(strm, req, res, last_connection, connection_close);
+  }
+
+  if (!ret) { return false; }
+
+  if (300 < res.status && res.status < 400 && follow_location_) {
+    ret = redirect(req, res);
+  }
 
-              if (ret && follow_location_ &&
-                  (300 < res.status && res.status < 400)) {
-                ret = redirect(req, res);
-              }
+#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
+  if (res.status == 401 || res.status == 407) {
+    auto is_proxy = res.status == 407;
+    const auto &username =
+        is_proxy ? proxy_digest_auth_username_ : digest_auth_username_;
+    const auto &password =
+        is_proxy ? proxy_digest_auth_password_ : digest_auth_password_;
+
+    if (!username.empty() && !password.empty()) {
+      std::map<std::string, std::string> auth;
+      if (parse_www_authenticate(res, auth, is_proxy)) {
+        Request new_req = req;
+        auto key = is_proxy ? "Proxy-Authorization" : "WWW-Authorization";
+        new_req.headers.erase(key);
+        new_req.headers.insert(make_digest_authentication_header(
+            req, auth, 1, random_string(10), username, password, is_proxy));
+
+        Response new_res;
+
+        ret = send(new_req, new_res);
+        if (ret) { res = new_res; }
+      }
+    }
+  }
+#endif
+
+  return ret;
+}
 
-              if (ret) { responses.emplace_back(std::move(res)); }
+#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
+inline bool Client::connect(socket_t sock, Response &res, bool &error) {
+  error = true;
+  Response res2;
+
+  if (!detail::process_socket(
+          true, sock, 1, read_timeout_sec_, read_timeout_usec_,
+          [&](Stream &strm, bool /*last_connection*/, bool &connection_close) {
+            Request req2;
+            req2.method = "CONNECT";
+            req2.path = host_and_port_;
+            return process_request(strm, req2, res2, false, connection_close);
+          })) {
+    detail::close_socket(sock);
+    error = false;
+    return false;
+  }
 
-              return ret;
-            })) {
+  if (res2.status == 407) {
+    if (!proxy_digest_auth_username_.empty() &&
+        !proxy_digest_auth_password_.empty()) {
+      std::map<std::string, std::string> auth;
+      if (parse_www_authenticate(res2, auth, true)) {
+        Response res3;
+        if (!detail::process_socket(
+                true, sock, 1, read_timeout_sec_, read_timeout_usec_,
+                [&](Stream &strm, bool /*last_connection*/,
+                    bool &connection_close) {
+                  Request req3;
+                  req3.method = "CONNECT";
+                  req3.path = host_and_port_;
+                  req3.headers.insert(make_digest_authentication_header(
+                      req3, auth, 1, random_string(10),
+                      proxy_digest_auth_username_, proxy_digest_auth_password_,
+                      true));
+                  return process_request(strm, req3, res3, false,
+                                         connection_close);
+                })) {
+          detail::close_socket(sock);
+          error = false;
+          return false;
+        }
+      }
+    } else {
+      res = res2;
       return false;
     }
   }
 
   return true;
 }
+#endif
 
 inline bool Client::redirect(const Request &req, Response &res) {
   if (req.redirect_count == 0) { return false; }
@@ -2847,46 +3743,47 @@ inline bool Client::redirect(const Request &req, Response &res) {
   auto location = res.get_header_value("location");
   if (location.empty()) { return false; }
 
-  std::regex re(
+  const static std::regex re(
       R"(^(?:([^:/?#]+):)?(?://([^/?#]*))?([^?#]*(?:\?[^#]*)?)(?:#.*)?)");
 
+  std::smatch m;
+  if (!regex_match(location, m, re)) { return false; }
+
   auto scheme = is_ssl() ? "https" : "http";
 
-  std::smatch m;
-  if (regex_match(location, m, re)) {
-    auto next_scheme = m[1].str();
-    auto next_host = m[2].str();
-    auto next_path = m[3].str();
-    if (next_host.empty()) { next_host = host_; }
-    if (next_path.empty()) { next_path = "/"; }
-
-    if (next_scheme == scheme && next_host == host_) {
-      return detail::redirect(*this, req, res, next_path);
-    } else {
-      if (next_scheme == "https") {
+  auto next_scheme = m[1].str();
+  auto next_host = m[2].str();
+  auto next_path = m[3].str();
+  if (next_scheme.empty()) { next_scheme = scheme; }
+  if (next_scheme.empty()) { next_scheme = scheme; }
+  if (next_host.empty()) { next_host = host_; }
+  if (next_path.empty()) { next_path = "/"; }
+
+  if (next_scheme == scheme && next_host == host_) {
+    return detail::redirect(*this, req, res, next_path);
+  } else {
+    if (next_scheme == "https") {
 #ifdef CPPHTTPLIB_OPENSSL_SUPPORT
-        SSLClient cli(next_host.c_str());
-        cli.follow_location(true);
-        return detail::redirect(cli, req, res, next_path);
+      SSLClient cli(next_host.c_str());
+      cli.copy_settings(*this);
+      return detail::redirect(cli, req, res, next_path);
 #else
-        return false;
+      return false;
 #endif
-      } else {
-        Client cli(next_host.c_str());
-        cli.follow_location(true);
-        return detail::redirect(cli, req, res, next_path);
-      }
+    } else {
+      Client cli(next_host.c_str());
+      cli.copy_settings(*this);
+      return detail::redirect(cli, req, res, next_path);
     }
   }
-  return false;
 }
 
-inline void Client::write_request(Stream &strm, const Request &req,
+inline bool Client::write_request(Stream &strm, const Request &req,
                                   bool last_connection) {
-  BufferStream bstrm;
+  detail::BufferStream bstrm;
 
   // Request line
-  auto path = detail::encode_url(req.path);
+  const auto &path = detail::encode_url(req.path);
 
   bstrm.write_format("%s %s HTTP/1.1\r\n", req.method.c_str(), path.c_str());
 
@@ -2913,11 +3810,14 @@ inline void Client::write_request(Stream &strm, const Request &req,
   if (!req.has_header("Accept")) { headers.emplace("Accept", "*/*"); }
 
   if (!req.has_header("User-Agent")) {
-    headers.emplace("User-Agent", "cpp-httplib/0.2");
+    headers.emplace("User-Agent", "cpp-httplib/0.5");
   }
 
   if (req.body.empty()) {
-    if (req.method == "POST" || req.method == "PUT" || req.method == "PATCH") {
+    if (req.content_provider) {
+      auto length = std::to_string(req.content_length);
+      headers.emplace("Content-Length", length);
+    } else {
       headers.emplace("Content-Length", "0");
     }
   } else {
@@ -2931,21 +3831,100 @@ inline void Client::write_request(Stream &strm, const Request &req,
     }
   }
 
-  detail::write_headers(bstrm, req, headers);
+  if (!basic_auth_username_.empty() && !basic_auth_password_.empty()) {
+    headers.insert(make_basic_authentication_header(
+        basic_auth_username_, basic_auth_password_, false));
+  }
 
-  // Body
-  if (!req.body.empty()) { bstrm.write(req.body); }
+  if (!proxy_basic_auth_username_.empty() &&
+      !proxy_basic_auth_password_.empty()) {
+    headers.insert(make_basic_authentication_header(
+        proxy_basic_auth_username_, proxy_basic_auth_password_, true));
+  }
+
+  detail::write_headers(bstrm, req, headers);
 
   // Flush buffer
   auto &data = bstrm.get_buffer();
   strm.write(data.data(), data.size());
+
+  // Body
+  if (req.body.empty()) {
+    if (req.content_provider) {
+      size_t offset = 0;
+      size_t end_offset = req.content_length;
+
+      DataSink data_sink;
+      data_sink.write = [&](const char *d, size_t l) {
+        auto written_length = strm.write(d, l);
+        offset += written_length;
+      };
+      data_sink.is_writable = [&](void) { return strm.is_writable(); };
+
+      while (offset < end_offset) {
+        req.content_provider(offset, end_offset - offset, data_sink);
+      }
+    }
+  } else {
+    strm.write(req.body);
+  }
+
+  return true;
+}
+
+inline std::shared_ptr<Response> Client::send_with_content_provider(
+    const char *method, const char *path, const Headers &headers,
+    const std::string &body, size_t content_length,
+    ContentProvider content_provider, const char *content_type) {
+  Request req;
+  req.method = method;
+  req.headers = headers;
+  req.path = path;
+
+  req.headers.emplace("Content-Type", content_type);
+
+#ifdef CPPHTTPLIB_ZLIB_SUPPORT
+  if (compress_) {
+    if (content_provider) {
+      size_t offset = 0;
+
+      DataSink data_sink;
+      data_sink.write = [&](const char *data, size_t data_len) {
+        req.body.append(data, data_len);
+        offset += data_len;
+      };
+      data_sink.is_writable = [&](void) { return true; };
+
+      while (offset < content_length) {
+        content_provider(offset, content_length - offset, data_sink);
+      }
+    } else {
+      req.body = body;
+    }
+
+    if (!detail::compress(req.body)) { return nullptr; }
+    req.headers.emplace("Content-Encoding", "gzip");
+  } else
+#endif
+  {
+    if (content_provider) {
+      req.content_length = content_length;
+      req.content_provider = content_provider;
+    } else {
+      req.body = body;
+    }
+  }
+
+  auto res = std::make_shared<Response>();
+
+  return send(req, *res) ? res : nullptr;
 }
 
 inline bool Client::process_request(Stream &strm, const Request &req,
                                     Response &res, bool last_connection,
                                     bool &connection_close) {
   // Send request
-  write_request(strm, req, last_connection);
+  if (!write_request(strm, req, last_connection)) { return false; }
 
   // Receive response and headers
   if (!read_response_line(strm, res) ||
@@ -2963,21 +3942,16 @@ inline bool Client::process_request(Stream &strm, const Request &req,
   }
 
   // Body
-  if (req.method != "HEAD") {
-    detail::ContentReceiverCore out = [&](const char *buf, size_t n) {
+  if (req.method != "HEAD" && req.method != "CONNECT") {
+    ContentReceiver out = [&](const char *buf, size_t n) {
       if (res.body.size() + n > res.body.max_size()) { return false; }
       res.body.append(buf, n);
       return true;
     };
 
     if (req.content_receiver) {
-      auto offset = std::make_shared<size_t>();
-      auto length = get_header_value_uint64(res.headers, "Content-Length", 0);
-      auto receiver = req.content_receiver;
-      out = [offset, length, receiver](const char *buf, size_t n) {
-        auto ret = receiver(buf, n, *offset, length);
-        (*offset) += n;
-        return ret;
+      out = [&](const char *buf, size_t n) {
+        return req.content_receiver(buf, n);
       };
     }
 
@@ -2988,6 +3962,9 @@ inline bool Client::process_request(Stream &strm, const Request &req,
     }
   }
 
+  // Log
+  if (logger_) { logger_(req, res); }
+
   return true;
 }
 
@@ -2997,25 +3974,25 @@ inline bool Client::process_and_close_socket(
                        bool &connection_close)>
         callback) {
   request_count = std::min(request_count, keep_alive_max_count_);
-  return detail::process_and_close_socket(true, sock, request_count, callback);
+  return detail::process_and_close_socket(true, sock, request_count,
+                                          read_timeout_sec_, read_timeout_usec_,
+                                          callback);
 }
 
 inline bool Client::is_ssl() const { return false; }
 
 inline std::shared_ptr<Response> Client::Get(const char *path) {
-  Progress dummy;
-  return Get(path, Headers(), dummy);
+  return Get(path, Headers(), Progress());
 }
 
 inline std::shared_ptr<Response> Client::Get(const char *path,
                                              Progress progress) {
-  return Get(path, Headers(), progress);
+  return Get(path, Headers(), std::move(progress));
 }
 
 inline std::shared_ptr<Response> Client::Get(const char *path,
                                              const Headers &headers) {
-  Progress dummy;
-  return Get(path, headers, dummy);
+  return Get(path, headers, Progress());
 }
 
 inline std::shared_ptr<Response>
@@ -3024,7 +4001,7 @@ Client::Get(const char *path, const Headers &headers, Progress progress) {
   req.method = "GET";
   req.path = path;
   req.headers = headers;
-  req.progress = progress;
+  req.progress = std::move(progress);
 
   auto res = std::make_shared<Response>();
   return send(req, *res) ? res : nullptr;
@@ -3032,36 +4009,36 @@ Client::Get(const char *path, const Headers &headers, Progress progress) {
 
 inline std::shared_ptr<Response> Client::Get(const char *path,
                                              ContentReceiver content_receiver) {
-  Progress dummy;
-  return Get(path, Headers(), nullptr, content_receiver, dummy);
+  return Get(path, Headers(), nullptr, std::move(content_receiver), Progress());
 }
 
 inline std::shared_ptr<Response> Client::Get(const char *path,
                                              ContentReceiver content_receiver,
                                              Progress progress) {
-  return Get(path, Headers(), nullptr, content_receiver, progress);
+  return Get(path, Headers(), nullptr, std::move(content_receiver),
+             std::move(progress));
 }
 
 inline std::shared_ptr<Response> Client::Get(const char *path,
                                              const Headers &headers,
                                              ContentReceiver content_receiver) {
-  Progress dummy;
-  return Get(path, headers, nullptr, content_receiver, dummy);
+  return Get(path, headers, nullptr, std::move(content_receiver), Progress());
 }
 
 inline std::shared_ptr<Response> Client::Get(const char *path,
                                              const Headers &headers,
                                              ContentReceiver content_receiver,
                                              Progress progress) {
-  return Get(path, headers, nullptr, content_receiver, progress);
+  return Get(path, headers, nullptr, std::move(content_receiver),
+             std::move(progress));
 }
 
 inline std::shared_ptr<Response> Client::Get(const char *path,
                                              const Headers &headers,
                                              ResponseHandler response_handler,
                                              ContentReceiver content_receiver) {
-  Progress dummy;
-  return Get(path, headers, response_handler, content_receiver, dummy);
+  return Get(path, headers, std::move(response_handler), content_receiver,
+             Progress());
 }
 
 inline std::shared_ptr<Response> Client::Get(const char *path,
@@ -3073,9 +4050,9 @@ inline std::shared_ptr<Response> Client::Get(const char *path,
   req.method = "GET";
   req.path = path;
   req.headers = headers;
-  req.response_handler = response_handler;
-  req.content_receiver = content_receiver;
-  req.progress = progress;
+  req.response_handler = std::move(response_handler);
+  req.content_receiver = std::move(content_receiver);
+  req.progress = std::move(progress);
 
   auto res = std::make_shared<Response>();
   return send(req, *res) ? res : nullptr;
@@ -3107,17 +4084,8 @@ inline std::shared_ptr<Response> Client::Post(const char *path,
                                               const Headers &headers,
                                               const std::string &body,
                                               const char *content_type) {
-  Request req;
-  req.method = "POST";
-  req.headers = headers;
-  req.path = path;
-
-  req.headers.emplace("Content-Type", content_type);
-  req.body = body;
-
-  auto res = std::make_shared<Response>();
-
-  return send(req, *res) ? res : nullptr;
+  return send_with_content_provider("POST", path, headers, body, 0, nullptr,
+                                    content_type);
 }
 
 inline std::shared_ptr<Response> Client::Post(const char *path,
@@ -3125,6 +4093,21 @@ inline std::shared_ptr<Response> Client::Post(const char *path,
   return Post(path, Headers(), params);
 }
 
+inline std::shared_ptr<Response> Client::Post(const char *path,
+                                              size_t content_length,
+                                              ContentProvider content_provider,
+                                              const char *content_type) {
+  return Post(path, Headers(), content_length, content_provider, content_type);
+}
+
+inline std::shared_ptr<Response>
+Client::Post(const char *path, const Headers &headers, size_t content_length,
+             ContentProvider content_provider, const char *content_type) {
+  return send_with_content_provider("POST", path, headers, std::string(),
+                                    content_length, content_provider,
+                                    content_type);
+}
+
 inline std::shared_ptr<Response>
 Client::Post(const char *path, const Headers &headers, const Params &params) {
   std::string query;
@@ -3146,35 +4129,28 @@ Client::Post(const char *path, const MultipartFormDataItems &items) {
 inline std::shared_ptr<Response>
 Client::Post(const char *path, const Headers &headers,
              const MultipartFormDataItems &items) {
-  Request req;
-  req.method = "POST";
-  req.headers = headers;
-  req.path = path;
-
   auto boundary = detail::make_multipart_data_boundary();
 
-  req.headers.emplace("Content-Type",
-                      "multipart/form-data; boundary=" + boundary);
+  std::string body;
 
   for (const auto &item : items) {
-    req.body += "--" + boundary + "\r\n";
-    req.body += "Content-Disposition: form-data; name=\"" + item.name + "\"";
+    body += "--" + boundary + "\r\n";
+    body += "Content-Disposition: form-data; name=\"" + item.name + "\"";
     if (!item.filename.empty()) {
-      req.body += "; filename=\"" + item.filename + "\"";
+      body += "; filename=\"" + item.filename + "\"";
     }
-    req.body += "\r\n";
+    body += "\r\n";
     if (!item.content_type.empty()) {
-      req.body += "Content-Type: " + item.content_type + "\r\n";
+      body += "Content-Type: " + item.content_type + "\r\n";
     }
-    req.body += "\r\n";
-    req.body += item.content + "\r\n";
+    body += "\r\n";
+    body += item.content + "\r\n";
   }
 
-  req.body += "--" + boundary + "--\r\n";
+  body += "--" + boundary + "--\r\n";
 
-  auto res = std::make_shared<Response>();
-
-  return send(req, *res) ? res : nullptr;
+  std::string content_type = "multipart/form-data; boundary=" + boundary;
+  return Post(path, headers, body, content_type.c_str());
 }
 
 inline std::shared_ptr<Response> Client::Put(const char *path,
@@ -3187,17 +4163,41 @@ inline std::shared_ptr<Response> Client::Put(const char *path,
                                              const Headers &headers,
                                              const std::string &body,
                                              const char *content_type) {
-  Request req;
-  req.method = "PUT";
-  req.headers = headers;
-  req.path = path;
+  return send_with_content_provider("PUT", path, headers, body, 0, nullptr,
+                                    content_type);
+}
 
-  req.headers.emplace("Content-Type", content_type);
-  req.body = body;
+inline std::shared_ptr<Response> Client::Put(const char *path,
+                                             size_t content_length,
+                                             ContentProvider content_provider,
+                                             const char *content_type) {
+  return Put(path, Headers(), content_length, content_provider, content_type);
+}
 
-  auto res = std::make_shared<Response>();
+inline std::shared_ptr<Response>
+Client::Put(const char *path, const Headers &headers, size_t content_length,
+            ContentProvider content_provider, const char *content_type) {
+  return send_with_content_provider("PUT", path, headers, std::string(),
+                                    content_length, content_provider,
+                                    content_type);
+}
 
-  return send(req, *res) ? res : nullptr;
+inline std::shared_ptr<Response> Client::Put(const char *path,
+                                             const Params &params) {
+  return Put(path, Headers(), params);
+}
+
+inline std::shared_ptr<Response>
+Client::Put(const char *path, const Headers &headers, const Params &params) {
+  std::string query;
+  for (auto it = params.begin(); it != params.end(); ++it) {
+    if (it != params.begin()) { query += "&"; }
+    query += it->first;
+    query += "=";
+    query += detail::encode_url(it->second);
+  }
+
+  return Put(path, headers, query, "application/x-www-form-urlencoded");
 }
 
 inline std::shared_ptr<Response> Client::Patch(const char *path,
@@ -3210,17 +4210,23 @@ inline std::shared_ptr<Response> Client::Patch(const char *path,
                                                const Headers &headers,
                                                const std::string &body,
                                                const char *content_type) {
-  Request req;
-  req.method = "PATCH";
-  req.headers = headers;
-  req.path = path;
-
-  req.headers.emplace("Content-Type", content_type);
-  req.body = body;
+  return send_with_content_provider("PATCH", path, headers, body, 0, nullptr,
+                                    content_type);
+}
 
-  auto res = std::make_shared<Response>();
+inline std::shared_ptr<Response> Client::Patch(const char *path,
+                                               size_t content_length,
+                                               ContentProvider content_provider,
+                                               const char *content_type) {
+  return Patch(path, Headers(), content_length, content_provider, content_type);
+}
 
-  return send(req, *res) ? res : nullptr;
+inline std::shared_ptr<Response>
+Client::Patch(const char *path, const Headers &headers, size_t content_length,
+              ContentProvider content_provider, const char *content_type) {
+  return send_with_content_provider("PATCH", path, headers, std::string(),
+                                    content_length, content_provider,
+                                    content_type);
 }
 
 inline std::shared_ptr<Response> Client::Delete(const char *path) {
@@ -3271,11 +4277,58 @@ inline std::shared_ptr<Response> Client::Options(const char *path,
   return send(req, *res) ? res : nullptr;
 }
 
+inline void Client::set_timeout_sec(time_t timeout_sec) {
+  timeout_sec_ = timeout_sec;
+}
+
+inline void Client::set_read_timeout(time_t sec, time_t usec) {
+  read_timeout_sec_ = sec;
+  read_timeout_usec_ = usec;
+}
+
 inline void Client::set_keep_alive_max_count(size_t count) {
   keep_alive_max_count_ = count;
 }
 
-inline void Client::follow_location(bool on) { follow_location_ = on; }
+inline void Client::set_basic_auth(const char *username, const char *password) {
+  basic_auth_username_ = username;
+  basic_auth_password_ = password;
+}
+
+#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
+inline void Client::set_digest_auth(const char *username,
+                                    const char *password) {
+  digest_auth_username_ = username;
+  digest_auth_password_ = password;
+}
+#endif
+
+inline void Client::set_follow_location(bool on) { follow_location_ = on; }
+
+inline void Client::set_compress(bool on) { compress_ = on; }
+
+inline void Client::set_interface(const char *intf) { interface_ = intf; }
+
+inline void Client::set_proxy(const char *host, int port) {
+  proxy_host_ = host;
+  proxy_port_ = port;
+}
+
+inline void Client::set_proxy_basic_auth(const char *username,
+                                         const char *password) {
+  proxy_basic_auth_username_ = username;
+  proxy_basic_auth_password_ = password;
+}
+
+#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
+inline void Client::set_proxy_digest_auth(const char *username,
+                                          const char *password) {
+  proxy_digest_auth_username_ = username;
+  proxy_digest_auth_password_ = password;
+}
+#endif
+
+inline void Client::set_logger(Logger logger) { logger_ = std::move(logger); }
 
 /*
  * SSL Implementation
@@ -3284,11 +4337,10 @@ inline void Client::follow_location(bool on) { follow_location_ = on; }
 namespace detail {
 
 template <typename U, typename V, typename T>
-inline bool process_and_close_socket_ssl(bool is_client_request, socket_t sock,
-                                         size_t keep_alive_max_count,
-                                         SSL_CTX *ctx, std::mutex &ctx_mutex,
-                                         U SSL_connect_or_accept, V setup,
-                                         T callback) {
+inline bool process_and_close_socket_ssl(
+    bool is_client_request, socket_t sock, size_t keep_alive_max_count,
+    time_t read_timeout_sec, time_t read_timeout_usec, SSL_CTX *ctx,
+    std::mutex &ctx_mutex, U SSL_connect_or_accept, V setup, T callback) {
   assert(keep_alive_max_count > 0);
 
   SSL *ssl = nullptr;
@@ -3316,7 +4368,7 @@ inline bool process_and_close_socket_ssl(bool is_client_request, socket_t sock,
     return false;
   }
 
-  bool ret = false;
+  auto ret = false;
 
   if (SSL_connect_or_accept(ssl) == 1) {
     if (keep_alive_max_count > 1) {
@@ -3325,7 +4377,7 @@ inline bool process_and_close_socket_ssl(bool is_client_request, socket_t sock,
              (is_client_request ||
               detail::select_read(sock, CPPHTTPLIB_KEEPALIVE_TIMEOUT_SECOND,
                                   CPPHTTPLIB_KEEPALIVE_TIMEOUT_USECOND) > 0)) {
-        SSLSocketStream strm(sock, ssl);
+        SSLSocketStream strm(sock, ssl, read_timeout_sec, read_timeout_usec);
         auto last_connection = count == 1;
         auto connection_close = false;
 
@@ -3335,7 +4387,7 @@ inline bool process_and_close_socket_ssl(bool is_client_request, socket_t sock,
         count--;
       }
     } else {
-      SSLSocketStream strm(sock, ssl);
+      SSLSocketStream strm(sock, ssl, read_timeout_sec, read_timeout_usec);
       auto dummy_connection_close = false;
       ret = callback(ssl, strm, true, dummy_connection_close);
     }
@@ -3382,11 +4434,20 @@ private:
 class SSLInit {
 public:
   SSLInit() {
+#if OPENSSL_VERSION_NUMBER < 0x1010001fL
     SSL_load_error_strings();
     SSL_library_init();
+#else
+    OPENSSL_init_ssl(
+        OPENSSL_INIT_LOAD_SSL_STRINGS | OPENSSL_INIT_LOAD_CRYPTO_STRINGS, NULL);
+#endif
   }
 
-  ~SSLInit() { ERR_free_strings(); }
+  ~SSLInit() {
+#if OPENSSL_VERSION_NUMBER < 0x1010001fL
+    ERR_free_strings();
+#endif
+  }
 
 private:
 #if OPENSSL_VERSION_NUMBER < 0x10100000L
@@ -3394,41 +4455,44 @@ private:
 #endif
 };
 
-static SSLInit sslinit_;
-
-} // namespace detail
-
 // SSL socket stream implementation
-inline SSLSocketStream::SSLSocketStream(socket_t sock, SSL *ssl)
-    : sock_(sock), ssl_(ssl) {}
+inline SSLSocketStream::SSLSocketStream(socket_t sock, SSL *ssl,
+                                        time_t read_timeout_sec,
+                                        time_t read_timeout_usec)
+    : sock_(sock), ssl_(ssl), read_timeout_sec_(read_timeout_sec),
+      read_timeout_usec_(read_timeout_usec) {}
 
 inline SSLSocketStream::~SSLSocketStream() {}
 
+inline bool SSLSocketStream::is_readable() const {
+  return detail::select_read(sock_, read_timeout_sec_, read_timeout_usec_) > 0;
+}
+
+inline bool SSLSocketStream::is_writable() const {
+  return detail::select_write(sock_, 0, 0) > 0;
+}
+
 inline int SSLSocketStream::read(char *ptr, size_t size) {
   if (SSL_pending(ssl_) > 0 ||
-      detail::select_read(sock_, CPPHTTPLIB_READ_TIMEOUT_SECOND,
-                          CPPHTTPLIB_READ_TIMEOUT_USECOND) > 0) {
+      select_read(sock_, read_timeout_sec_, read_timeout_usec_) > 0) {
     return SSL_read(ssl_, ptr, static_cast<int>(size));
   }
   return -1;
 }
 
 inline int SSLSocketStream::write(const char *ptr, size_t size) {
-  return SSL_write(ssl_, ptr, static_cast<int>(size));
-}
-
-inline int SSLSocketStream::write(const char *ptr) {
-  return write(ptr, strlen(ptr));
-}
-
-inline int SSLSocketStream::write(const std::string &s) {
-  return write(s.data(), s.size());
+  if (is_writable()) { return SSL_write(ssl_, ptr, static_cast<int>(size)); }
+  return -1;
 }
 
 inline std::string SSLSocketStream::get_remote_addr() const {
   return detail::get_remote_addr(sock_);
 }
 
+static SSLInit sslinit_;
+
+} // namespace detail
+
 // SSL HTTP server implementation
 inline SSLServer::SSLServer(const char *cert_path, const char *private_key_path,
                             const char *client_ca_cert_file_path,
@@ -3476,8 +4540,8 @@ inline bool SSLServer::is_valid() const { return ctx_; }
 
 inline bool SSLServer::process_and_close_socket(socket_t sock) {
   return detail::process_and_close_socket_ssl(
-      false, sock, keep_alive_max_count_, ctx_, ctx_mutex_, SSL_accept,
-      [](SSL * /*ssl*/) { return true; },
+      false, sock, keep_alive_max_count_, read_timeout_sec_, read_timeout_usec_,
+      ctx_, ctx_mutex_, SSL_accept, [](SSL * /*ssl*/) { return true; },
       [this](SSL *ssl, Stream &strm, bool last_connection,
              bool &connection_close) {
         return process_request(strm, last_connection, connection_close,
@@ -3486,21 +4550,21 @@ inline bool SSLServer::process_and_close_socket(socket_t sock) {
 }
 
 // SSL HTTP client implementation
-inline SSLClient::SSLClient(const char *host, int port, time_t timeout_sec,
-                            const char *client_cert_path,
-                            const char *client_key_path)
-    : Client(host, port, timeout_sec) {
+inline SSLClient::SSLClient(const std::string &host, int port,
+                            const std::string &client_cert_path,
+                            const std::string &client_key_path)
+    : Client(host, port, client_cert_path, client_key_path) {
   ctx_ = SSL_CTX_new(SSLv23_client_method());
 
   detail::split(&host_[0], &host_[host_.size()], '.',
                 [&](const char *b, const char *e) {
                   host_components_.emplace_back(std::string(b, e));
                 });
-  if (client_cert_path && client_key_path) {
-    if (SSL_CTX_use_certificate_file(ctx_, client_cert_path,
+  if (!client_cert_path.empty() && !client_key_path.empty()) {
+    if (SSL_CTX_use_certificate_file(ctx_, client_cert_path.c_str(),
                                      SSL_FILETYPE_PEM) != 1 ||
-        SSL_CTX_use_PrivateKey_file(ctx_, client_key_path, SSL_FILETYPE_PEM) !=
-            1) {
+        SSL_CTX_use_PrivateKey_file(ctx_, client_key_path.c_str(),
+                                    SSL_FILETYPE_PEM) != 1) {
       SSL_CTX_free(ctx_);
       ctx_ = nullptr;
     }
@@ -3527,9 +4591,7 @@ inline long SSLClient::get_openssl_verify_result() const {
   return verify_result_;
 }
 
-inline SSL_CTX* SSLClient::ssl_context() const noexcept {
-        return ctx_;
-}
+inline SSL_CTX *SSLClient::ssl_context() const noexcept { return ctx_; }
 
 inline bool SSLClient::process_and_close_socket(
     socket_t sock, size_t request_count,
@@ -3541,7 +4603,8 @@ inline bool SSLClient::process_and_close_socket(
 
   return is_valid() &&
          detail::process_and_close_socket_ssl(
-             true, sock, request_count, ctx_, ctx_mutex_,
+             true, sock, request_count, read_timeout_sec_, read_timeout_usec_,
+             ctx_, ctx_mutex_,
              [&](SSL *ssl) {
                if (ca_cert_file_path_.empty()) {
                  SSL_CTX_set_verify(ctx_, SSL_VERIFY_NONE, nullptr);
@@ -3712,6 +4775,8 @@ inline bool SSLClient::check_host_name(const char *pattern,
 }
 #endif
 
+// ----------------------------------------------------------------------------
+
 } // namespace httplib
 
 #endif // CPPHTTPLIB_HTTPLIB_H
diff --git a/src/core/hle/service/bcat/backend/boxcat.cpp b/src/core/hle/service/bcat/backend/boxcat.cpp
index 67e39a5c4..f589864ee 100644
--- a/src/core/hle/service/bcat/backend/boxcat.cpp
+++ b/src/core/hle/service/bcat/backend/boxcat.cpp
@@ -200,7 +200,8 @@ private:
     DownloadResult DownloadInternal(const std::string& resolved_path, u32 timeout_seconds,
                                     const std::string& content_type_name) {
         if (client == nullptr) {
-            client = std::make_unique<httplib::SSLClient>(BOXCAT_HOSTNAME, PORT, timeout_seconds);
+            client = std::make_unique<httplib::SSLClient>(BOXCAT_HOSTNAME, PORT);
+            client->set_timeout_sec(timeout_seconds);
         }
 
         httplib::Headers headers{
@@ -448,8 +449,8 @@ std::optional<std::vector<u8>> Boxcat::GetLaunchParameter(TitleIDVersion title)
 
 Boxcat::StatusResult Boxcat::GetStatus(std::optional<std::string>& global,
                                        std::map<std::string, EventStatus>& games) {
-    httplib::SSLClient client{BOXCAT_HOSTNAME, static_cast<int>(PORT),
-                              static_cast<int>(TIMEOUT_SECONDS)};
+    httplib::SSLClient client{BOXCAT_HOSTNAME, static_cast<int>(PORT)};
+    client.set_timeout_sec(static_cast<int>(TIMEOUT_SECONDS));
 
     httplib::Headers headers{
         {std::string("Game-Assets-API-Version"), std::string(BOXCAT_API_VERSION)},
diff --git a/src/video_core/CMakeLists.txt b/src/video_core/CMakeLists.txt
index db9332d00..4b0c6346f 100644
--- a/src/video_core/CMakeLists.txt
+++ b/src/video_core/CMakeLists.txt
@@ -37,6 +37,7 @@ add_library(video_core STATIC
     memory_manager.h
     morton.cpp
     morton.h
+    query_cache.h
     rasterizer_accelerated.cpp
     rasterizer_accelerated.h
     rasterizer_cache.cpp
@@ -74,6 +75,8 @@ add_library(video_core STATIC
     renderer_opengl/gl_stream_buffer.h
     renderer_opengl/gl_texture_cache.cpp
     renderer_opengl/gl_texture_cache.h
+    renderer_opengl/gl_query_cache.cpp
+    renderer_opengl/gl_query_cache.h
     renderer_opengl/maxwell_to_gl.h
     renderer_opengl/renderer_opengl.cpp
     renderer_opengl/renderer_opengl.h
@@ -177,6 +180,8 @@ if (ENABLE_VULKAN)
         renderer_vulkan/vk_memory_manager.h
         renderer_vulkan/vk_pipeline_cache.cpp
         renderer_vulkan/vk_pipeline_cache.h
+        renderer_vulkan/vk_query_cache.cpp
+        renderer_vulkan/vk_query_cache.h
         renderer_vulkan/vk_rasterizer.cpp
         renderer_vulkan/vk_rasterizer.h
         renderer_vulkan/vk_renderpass_cache.cpp
diff --git a/src/video_core/engines/maxwell_3d.cpp b/src/video_core/engines/maxwell_3d.cpp
index 0b3e8749b..b28de1092 100644
--- a/src/video_core/engines/maxwell_3d.cpp
+++ b/src/video_core/engines/maxwell_3d.cpp
@@ -4,6 +4,7 @@
 
 #include <cinttypes>
 #include <cstring>
+#include <optional>
 #include "common/assert.h"
 #include "core/core.h"
 #include "core/core_timing.h"
@@ -16,6 +17,8 @@
 
 namespace Tegra::Engines {
 
+using VideoCore::QueryType;
+
 /// First register id that is actually a Macro call.
 constexpr u32 MacroRegistersStart = 0xE00;
 
@@ -400,6 +403,10 @@ void Maxwell3D::CallMethod(const GPU::MethodCall& method_call) {
         ProcessQueryCondition();
         break;
     }
+    case MAXWELL3D_REG_INDEX(counter_reset): {
+        ProcessCounterReset();
+        break;
+    }
     case MAXWELL3D_REG_INDEX(sync_info): {
         ProcessSyncPoint();
         break;
@@ -482,7 +489,7 @@ void Maxwell3D::FlushMMEInlineDraw() {
 
     const bool is_indexed = mme_draw.current_mode == MMEDrawMode::Indexed;
     if (ShouldExecute()) {
-        rasterizer.DrawMultiBatch(is_indexed);
+        rasterizer.Draw(is_indexed, true);
     }
 
     // TODO(bunnei): Below, we reset vertex count so that we can use these registers to determine if
@@ -544,40 +551,28 @@ void Maxwell3D::ProcessQueryGet() {
                "Units other than CROP are unimplemented");
 
     switch (regs.query.query_get.operation) {
-    case Regs::QueryOperation::Release: {
-        const u64 result = regs.query.query_sequence;
-        StampQueryResult(result, regs.query.query_get.short_query == 0);
+    case Regs::QueryOperation::Release:
+        StampQueryResult(regs.query.query_sequence, regs.query.query_get.short_query == 0);
         break;
-    }
-    case Regs::QueryOperation::Acquire: {
-        // Todo(Blinkhawk): Under this operation, the GPU waits for the CPU
-        // to write a value that matches the current payload.
+    case Regs::QueryOperation::Acquire:
+        // TODO(Blinkhawk): Under this operation, the GPU waits for the CPU to write a value that
+        // matches the current payload.
         UNIMPLEMENTED_MSG("Unimplemented query operation ACQUIRE");
         break;
-    }
-    case Regs::QueryOperation::Counter: {
-        u64 result{};
-        switch (regs.query.query_get.select) {
-        case Regs::QuerySelect::Zero:
-            result = 0;
-            break;
-        default:
-            result = 1;
-            UNIMPLEMENTED_MSG("Unimplemented query select type {}",
-                              static_cast<u32>(regs.query.query_get.select.Value()));
+    case Regs::QueryOperation::Counter:
+        if (const std::optional<u64> result = GetQueryResult()) {
+            // If the query returns an empty optional it means it's cached and deferred.
+            // In this case we have a non-empty result, so we stamp it immediately.
+            StampQueryResult(*result, regs.query.query_get.short_query == 0);
         }
-        StampQueryResult(result, regs.query.query_get.short_query == 0);
         break;
-    }
-    case Regs::QueryOperation::Trap: {
+    case Regs::QueryOperation::Trap:
         UNIMPLEMENTED_MSG("Unimplemented query operation TRAP");
         break;
-    }
-    default: {
+    default:
         UNIMPLEMENTED_MSG("Unknown query operation");
         break;
     }
-    }
 }
 
 void Maxwell3D::ProcessQueryCondition() {
@@ -593,20 +588,20 @@ void Maxwell3D::ProcessQueryCondition() {
     }
     case Regs::ConditionMode::ResNonZero: {
         Regs::QueryCompare cmp;
-        memory_manager.ReadBlockUnsafe(condition_address, &cmp, sizeof(cmp));
+        memory_manager.ReadBlock(condition_address, &cmp, sizeof(cmp));
         execute_on = cmp.initial_sequence != 0U && cmp.initial_mode != 0U;
         break;
     }
     case Regs::ConditionMode::Equal: {
         Regs::QueryCompare cmp;
-        memory_manager.ReadBlockUnsafe(condition_address, &cmp, sizeof(cmp));
+        memory_manager.ReadBlock(condition_address, &cmp, sizeof(cmp));
         execute_on =
             cmp.initial_sequence == cmp.current_sequence && cmp.initial_mode == cmp.current_mode;
         break;
     }
     case Regs::ConditionMode::NotEqual: {
         Regs::QueryCompare cmp;
-        memory_manager.ReadBlockUnsafe(condition_address, &cmp, sizeof(cmp));
+        memory_manager.ReadBlock(condition_address, &cmp, sizeof(cmp));
         execute_on =
             cmp.initial_sequence != cmp.current_sequence || cmp.initial_mode != cmp.current_mode;
         break;
@@ -619,6 +614,18 @@ void Maxwell3D::ProcessQueryCondition() {
     }
 }
 
+void Maxwell3D::ProcessCounterReset() {
+    switch (regs.counter_reset) {
+    case Regs::CounterReset::SampleCnt:
+        rasterizer.ResetCounter(QueryType::SamplesPassed);
+        break;
+    default:
+        LOG_WARNING(Render_OpenGL, "Unimplemented counter reset={}",
+                    static_cast<int>(regs.counter_reset));
+        break;
+    }
+}
+
 void Maxwell3D::ProcessSyncPoint() {
     const u32 sync_point = regs.sync_info.sync_point.Value();
     const u32 increment = regs.sync_info.increment.Value();
@@ -647,7 +654,7 @@ void Maxwell3D::DrawArrays() {
 
     const bool is_indexed{regs.index_array.count && !regs.vertex_buffer.count};
     if (ShouldExecute()) {
-        rasterizer.DrawBatch(is_indexed);
+        rasterizer.Draw(is_indexed, false);
     }
 
     // TODO(bunnei): Below, we reset vertex count so that we can use these registers to determine if
@@ -661,6 +668,22 @@ void Maxwell3D::DrawArrays() {
     }
 }
 
+std::optional<u64> Maxwell3D::GetQueryResult() {
+    switch (regs.query.query_get.select) {
+    case Regs::QuerySelect::Zero:
+        return 0;
+    case Regs::QuerySelect::SamplesPassed:
+        // Deferred.
+        rasterizer.Query(regs.query.QueryAddress(), VideoCore::QueryType::SamplesPassed,
+                         system.GPU().GetTicks());
+        return {};
+    default:
+        UNIMPLEMENTED_MSG("Unimplemented query select type {}",
+                          static_cast<u32>(regs.query.query_get.select.Value()));
+        return 1;
+    }
+}
+
 void Maxwell3D::ProcessCBBind(std::size_t stage_index) {
     // Bind the buffer currently in CB_ADDRESS to the specified index in the desired shader stage.
     auto& shader = state.shader_stages[stage_index];
diff --git a/src/video_core/engines/maxwell_3d.h b/src/video_core/engines/maxwell_3d.h
index 0a2af54e5..26939be3f 100644
--- a/src/video_core/engines/maxwell_3d.h
+++ b/src/video_core/engines/maxwell_3d.h
@@ -6,6 +6,7 @@
 
 #include <array>
 #include <bitset>
+#include <optional>
 #include <type_traits>
 #include <unordered_map>
 #include <vector>
@@ -409,6 +410,27 @@ public:
             Linear = 1,
         };
 
+        enum class CounterReset : u32 {
+            SampleCnt = 0x01,
+            Unk02 = 0x02,
+            Unk03 = 0x03,
+            Unk04 = 0x04,
+            EmittedPrimitives = 0x10, // Not tested
+            Unk11 = 0x11,
+            Unk12 = 0x12,
+            Unk13 = 0x13,
+            Unk15 = 0x15,
+            Unk16 = 0x16,
+            Unk17 = 0x17,
+            Unk18 = 0x18,
+            Unk1A = 0x1A,
+            Unk1B = 0x1B,
+            Unk1C = 0x1C,
+            Unk1D = 0x1D,
+            Unk1E = 0x1E,
+            GeneratedPrimitives = 0x1F,
+        };
+
         struct Cull {
             enum class FrontFace : u32 {
                 ClockWise = 0x0900,
@@ -857,7 +879,7 @@ public:
                     BitField<7, 1, u32> c7;
                 } clip_distance_enabled;
 
-                INSERT_UNION_PADDING_WORDS(0x1);
+                u32 samplecnt_enable;
 
                 float point_size;
 
@@ -865,7 +887,11 @@ public:
 
                 u32 point_sprite_enable;
 
-                INSERT_UNION_PADDING_WORDS(0x5);
+                INSERT_UNION_PADDING_WORDS(0x3);
+
+                CounterReset counter_reset;
+
+                INSERT_UNION_PADDING_WORDS(0x1);
 
                 u32 zeta_enable;
 
@@ -1412,12 +1438,15 @@ private:
     /// Handles a write to the QUERY_GET register.
     void ProcessQueryGet();
 
-    // Writes the query result accordingly
+    /// Writes the query result accordingly.
     void StampQueryResult(u64 payload, bool long_query);
 
-    // Handles Conditional Rendering
+    /// Handles conditional rendering.
     void ProcessQueryCondition();
 
+    /// Handles counter resets.
+    void ProcessCounterReset();
+
     /// Handles writes to syncing register.
     void ProcessSyncPoint();
 
@@ -1434,6 +1463,9 @@ private:
 
     // Handles a instance drawcall from MME
     void StepInstance(MMEDrawMode expected_mode, u32 count);
+
+    /// Returns a query's value or an empty object if the value will be deferred through a cache.
+    std::optional<u64> GetQueryResult();
 };
 
 #define ASSERT_REG_POSITION(field_name, position)                                                  \
@@ -1499,8 +1531,10 @@ ASSERT_REG_POSITION(screen_y_control, 0x4EB);
 ASSERT_REG_POSITION(vb_element_base, 0x50D);
 ASSERT_REG_POSITION(vb_base_instance, 0x50E);
 ASSERT_REG_POSITION(clip_distance_enabled, 0x544);
+ASSERT_REG_POSITION(samplecnt_enable, 0x545);
 ASSERT_REG_POSITION(point_size, 0x546);
 ASSERT_REG_POSITION(point_sprite_enable, 0x548);
+ASSERT_REG_POSITION(counter_reset, 0x54C);
 ASSERT_REG_POSITION(zeta_enable, 0x54E);
 ASSERT_REG_POSITION(multisample_control, 0x54F);
 ASSERT_REG_POSITION(condition, 0x554);
diff --git a/src/video_core/memory_manager.cpp b/src/video_core/memory_manager.cpp
index 11848fbce..f5d33f27a 100644
--- a/src/video_core/memory_manager.cpp
+++ b/src/video_core/memory_manager.cpp
@@ -9,6 +9,7 @@
 #include "core/hle/kernel/process.h"
 #include "core/hle/kernel/vm_manager.h"
 #include "core/memory.h"
+#include "video_core/gpu.h"
 #include "video_core/memory_manager.h"
 #include "video_core/rasterizer_interface.h"
 
@@ -84,7 +85,9 @@ GPUVAddr MemoryManager::UnmapBuffer(GPUVAddr gpu_addr, u64 size) {
     const auto cpu_addr = GpuToCpuAddress(gpu_addr);
     ASSERT(cpu_addr);
 
-    rasterizer.FlushAndInvalidateRegion(cache_addr, aligned_size);
+    // Flush and invalidate through the GPU interface, to be asynchronous if possible.
+    system.GPU().FlushAndInvalidateRegion(cache_addr, aligned_size);
+
     UnmapRange(gpu_addr, aligned_size);
     ASSERT(system.CurrentProcess()
                ->VMManager()
@@ -242,6 +245,8 @@ void MemoryManager::ReadBlock(GPUVAddr src_addr, void* dest_buffer, const std::s
         switch (page_table.attributes[page_index]) {
         case Common::PageType::Memory: {
             const u8* src_ptr{page_table.pointers[page_index] + page_offset};
+            // Flush must happen on the rasterizer interface, such that memory is always synchronous
+            // when it is read (even when in asynchronous GPU mode). Fixes Dead Cells title menu.
             rasterizer.FlushRegion(ToCacheAddr(src_ptr), copy_amount);
             std::memcpy(dest_buffer, src_ptr, copy_amount);
             break;
@@ -292,6 +297,8 @@ void MemoryManager::WriteBlock(GPUVAddr dest_addr, const void* src_buffer, const
         switch (page_table.attributes[page_index]) {
         case Common::PageType::Memory: {
             u8* dest_ptr{page_table.pointers[page_index] + page_offset};
+            // Invalidate must happen on the rasterizer interface, such that memory is always
+            // synchronous when it is written (even when in asynchronous GPU mode).
             rasterizer.InvalidateRegion(ToCacheAddr(dest_ptr), copy_amount);
             std::memcpy(dest_ptr, src_buffer, copy_amount);
             break;
@@ -339,6 +346,8 @@ void MemoryManager::CopyBlock(GPUVAddr dest_addr, GPUVAddr src_addr, const std::
 
         switch (page_table.attributes[page_index]) {
         case Common::PageType::Memory: {
+            // Flush must happen on the rasterizer interface, such that memory is always synchronous
+            // when it is copied (even when in asynchronous GPU mode).
             const u8* src_ptr{page_table.pointers[page_index] + page_offset};
             rasterizer.FlushRegion(ToCacheAddr(src_ptr), copy_amount);
             WriteBlock(dest_addr, src_ptr, copy_amount);
diff --git a/src/video_core/query_cache.h b/src/video_core/query_cache.h
new file mode 100644
index 000000000..e66054ed0
--- /dev/null
+++ b/src/video_core/query_cache.h
@@ -0,0 +1,359 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <algorithm>
+#include <array>
+#include <cstring>
+#include <iterator>
+#include <memory>
+#include <mutex>
+#include <optional>
+#include <unordered_map>
+#include <vector>
+
+#include "common/assert.h"
+#include "core/core.h"
+#include "video_core/engines/maxwell_3d.h"
+#include "video_core/gpu.h"
+#include "video_core/memory_manager.h"
+#include "video_core/rasterizer_interface.h"
+
+namespace VideoCommon {
+
+template <class QueryCache, class HostCounter>
+class CounterStreamBase {
+public:
+    explicit CounterStreamBase(QueryCache& cache, VideoCore::QueryType type)
+        : cache{cache}, type{type} {}
+
+    /// Updates the state of the stream, enabling or disabling as needed.
+    void Update(bool enabled) {
+        if (enabled) {
+            Enable();
+        } else {
+            Disable();
+        }
+    }
+
+    /// Resets the stream to zero. It doesn't disable the query after resetting.
+    void Reset() {
+        if (current) {
+            current->EndQuery();
+
+            // Immediately start a new query to avoid disabling its state.
+            current = cache.Counter(nullptr, type);
+        }
+        last = nullptr;
+    }
+
+    /// Returns the current counter slicing as needed.
+    std::shared_ptr<HostCounter> Current() {
+        if (!current) {
+            return nullptr;
+        }
+        current->EndQuery();
+        last = std::move(current);
+        current = cache.Counter(last, type);
+        return last;
+    }
+
+    /// Returns true when the counter stream is enabled.
+    bool IsEnabled() const {
+        return current != nullptr;
+    }
+
+private:
+    /// Enables the stream.
+    void Enable() {
+        if (current) {
+            return;
+        }
+        current = cache.Counter(last, type);
+    }
+
+    // Disables the stream.
+    void Disable() {
+        if (current) {
+            current->EndQuery();
+        }
+        last = std::exchange(current, nullptr);
+    }
+
+    QueryCache& cache;
+    const VideoCore::QueryType type;
+
+    std::shared_ptr<HostCounter> current;
+    std::shared_ptr<HostCounter> last;
+};
+
+template <class QueryCache, class CachedQuery, class CounterStream, class HostCounter,
+          class QueryPool>
+class QueryCacheBase {
+public:
+    explicit QueryCacheBase(Core::System& system, VideoCore::RasterizerInterface& rasterizer)
+        : system{system}, rasterizer{rasterizer}, streams{{CounterStream{
+                                                      static_cast<QueryCache&>(*this),
+                                                      VideoCore::QueryType::SamplesPassed}}} {}
+
+    void InvalidateRegion(CacheAddr addr, std::size_t size) {
+        std::unique_lock lock{mutex};
+        FlushAndRemoveRegion(addr, size);
+    }
+
+    void FlushRegion(CacheAddr addr, std::size_t size) {
+        std::unique_lock lock{mutex};
+        FlushAndRemoveRegion(addr, size);
+    }
+
+    /**
+     * Records a query in GPU mapped memory, potentially marked with a timestamp.
+     * @param gpu_addr  GPU address to flush to when the mapped memory is read.
+     * @param type      Query type, e.g. SamplesPassed.
+     * @param timestamp Timestamp, when empty the flushed query is assumed to be short.
+     */
+    void Query(GPUVAddr gpu_addr, VideoCore::QueryType type, std::optional<u64> timestamp) {
+        std::unique_lock lock{mutex};
+        auto& memory_manager = system.GPU().MemoryManager();
+        const auto host_ptr = memory_manager.GetPointer(gpu_addr);
+
+        CachedQuery* query = TryGet(ToCacheAddr(host_ptr));
+        if (!query) {
+            const auto cpu_addr = memory_manager.GpuToCpuAddress(gpu_addr);
+            ASSERT_OR_EXECUTE(cpu_addr, return;);
+
+            query = Register(type, *cpu_addr, host_ptr, timestamp.has_value());
+        }
+
+        query->BindCounter(Stream(type).Current(), timestamp);
+    }
+
+    /// Updates counters from GPU state. Expected to be called once per draw, clear or dispatch.
+    void UpdateCounters() {
+        std::unique_lock lock{mutex};
+        const auto& regs = system.GPU().Maxwell3D().regs;
+        Stream(VideoCore::QueryType::SamplesPassed).Update(regs.samplecnt_enable);
+    }
+
+    /// Resets a counter to zero. It doesn't disable the query after resetting.
+    void ResetCounter(VideoCore::QueryType type) {
+        std::unique_lock lock{mutex};
+        Stream(type).Reset();
+    }
+
+    /// Disable all active streams. Expected to be called at the end of a command buffer.
+    void DisableStreams() {
+        std::unique_lock lock{mutex};
+        for (auto& stream : streams) {
+            stream.Update(false);
+        }
+    }
+
+    /// Returns a new host counter.
+    std::shared_ptr<HostCounter> Counter(std::shared_ptr<HostCounter> dependency,
+                                         VideoCore::QueryType type) {
+        return std::make_shared<HostCounter>(static_cast<QueryCache&>(*this), std::move(dependency),
+                                             type);
+    }
+
+    /// Returns the counter stream of the specified type.
+    CounterStream& Stream(VideoCore::QueryType type) {
+        return streams[static_cast<std::size_t>(type)];
+    }
+
+    /// Returns the counter stream of the specified type.
+    const CounterStream& Stream(VideoCore::QueryType type) const {
+        return streams[static_cast<std::size_t>(type)];
+    }
+
+protected:
+    std::array<QueryPool, VideoCore::NumQueryTypes> query_pools;
+
+private:
+    /// Flushes a memory range to guest memory and removes it from the cache.
+    void FlushAndRemoveRegion(CacheAddr addr, std::size_t size) {
+        const u64 addr_begin = static_cast<u64>(addr);
+        const u64 addr_end = addr_begin + static_cast<u64>(size);
+        const auto in_range = [addr_begin, addr_end](CachedQuery& query) {
+            const u64 cache_begin = query.GetCacheAddr();
+            const u64 cache_end = cache_begin + query.SizeInBytes();
+            return cache_begin < addr_end && addr_begin < cache_end;
+        };
+
+        const u64 page_end = addr_end >> PAGE_SHIFT;
+        for (u64 page = addr_begin >> PAGE_SHIFT; page <= page_end; ++page) {
+            const auto& it = cached_queries.find(page);
+            if (it == std::end(cached_queries)) {
+                continue;
+            }
+            auto& contents = it->second;
+            for (auto& query : contents) {
+                if (!in_range(query)) {
+                    continue;
+                }
+                rasterizer.UpdatePagesCachedCount(query.CpuAddr(), query.SizeInBytes(), -1);
+                query.Flush();
+            }
+            contents.erase(std::remove_if(std::begin(contents), std::end(contents), in_range),
+                           std::end(contents));
+        }
+    }
+
+    /// Registers the passed parameters as cached and returns a pointer to the stored cached query.
+    CachedQuery* Register(VideoCore::QueryType type, VAddr cpu_addr, u8* host_ptr, bool timestamp) {
+        rasterizer.UpdatePagesCachedCount(cpu_addr, CachedQuery::SizeInBytes(timestamp), 1);
+        const u64 page = static_cast<u64>(ToCacheAddr(host_ptr)) >> PAGE_SHIFT;
+        return &cached_queries[page].emplace_back(static_cast<QueryCache&>(*this), type, cpu_addr,
+                                                  host_ptr);
+    }
+
+    /// Tries to a get a cached query. Returns nullptr on failure.
+    CachedQuery* TryGet(CacheAddr addr) {
+        const u64 page = static_cast<u64>(addr) >> PAGE_SHIFT;
+        const auto it = cached_queries.find(page);
+        if (it == std::end(cached_queries)) {
+            return nullptr;
+        }
+        auto& contents = it->second;
+        const auto found =
+            std::find_if(std::begin(contents), std::end(contents),
+                         [addr](auto& query) { return query.GetCacheAddr() == addr; });
+        return found != std::end(contents) ? &*found : nullptr;
+    }
+
+    static constexpr std::uintptr_t PAGE_SIZE = 4096;
+    static constexpr unsigned PAGE_SHIFT = 12;
+
+    Core::System& system;
+    VideoCore::RasterizerInterface& rasterizer;
+
+    std::recursive_mutex mutex;
+
+    std::unordered_map<u64, std::vector<CachedQuery>> cached_queries;
+
+    std::array<CounterStream, VideoCore::NumQueryTypes> streams;
+};
+
+template <class QueryCache, class HostCounter>
+class HostCounterBase {
+public:
+    explicit HostCounterBase(std::shared_ptr<HostCounter> dependency_)
+        : dependency{std::move(dependency_)}, depth{dependency ? (dependency->Depth() + 1) : 0} {
+        // Avoid nesting too many dependencies to avoid a stack overflow when these are deleted.
+        constexpr u64 depth_threshold = 96;
+        if (depth > depth_threshold) {
+            depth = 0;
+            base_result = dependency->Query();
+            dependency = nullptr;
+        }
+    }
+    virtual ~HostCounterBase() = default;
+
+    /// Returns the current value of the query.
+    u64 Query() {
+        if (result) {
+            return *result;
+        }
+
+        u64 value = BlockingQuery() + base_result;
+        if (dependency) {
+            value += dependency->Query();
+            dependency = nullptr;
+        }
+
+        result = value;
+        return *result;
+    }
+
+    /// Returns true when flushing this query will potentially wait.
+    bool WaitPending() const noexcept {
+        return result.has_value();
+    }
+
+    u64 Depth() const noexcept {
+        return depth;
+    }
+
+protected:
+    /// Returns the value of query from the backend API blocking as needed.
+    virtual u64 BlockingQuery() const = 0;
+
+private:
+    std::shared_ptr<HostCounter> dependency; ///< Counter to add to this value.
+    std::optional<u64> result;               ///< Filled with the already returned value.
+    u64 depth;                               ///< Number of nested dependencies.
+    u64 base_result = 0;                     ///< Equivalent to nested dependencies value.
+};
+
+template <class HostCounter>
+class CachedQueryBase {
+public:
+    explicit CachedQueryBase(VAddr cpu_addr, u8* host_ptr)
+        : cpu_addr{cpu_addr}, host_ptr{host_ptr} {}
+    virtual ~CachedQueryBase() = default;
+
+    CachedQueryBase(CachedQueryBase&&) noexcept = default;
+    CachedQueryBase(const CachedQueryBase&) = delete;
+
+    CachedQueryBase& operator=(CachedQueryBase&&) noexcept = default;
+    CachedQueryBase& operator=(const CachedQueryBase&) = delete;
+
+    /// Flushes the query to guest memory.
+    virtual void Flush() {
+        // When counter is nullptr it means that it's just been reseted. We are supposed to write a
+        // zero in these cases.
+        const u64 value = counter ? counter->Query() : 0;
+        std::memcpy(host_ptr, &value, sizeof(u64));
+
+        if (timestamp) {
+            std::memcpy(host_ptr + TIMESTAMP_OFFSET, &*timestamp, sizeof(u64));
+        }
+    }
+
+    /// Binds a counter to this query.
+    void BindCounter(std::shared_ptr<HostCounter> counter_, std::optional<u64> timestamp_) {
+        if (counter) {
+            // If there's an old counter set it means the query is being rewritten by the game.
+            // To avoid losing the data forever, flush here.
+            Flush();
+        }
+        counter = std::move(counter_);
+        timestamp = timestamp_;
+    }
+
+    VAddr CpuAddr() const noexcept {
+        return cpu_addr;
+    }
+
+    CacheAddr GetCacheAddr() const noexcept {
+        return ToCacheAddr(host_ptr);
+    }
+
+    u64 SizeInBytes() const noexcept {
+        return SizeInBytes(timestamp.has_value());
+    }
+
+    static constexpr u64 SizeInBytes(bool with_timestamp) noexcept {
+        return with_timestamp ? LARGE_QUERY_SIZE : SMALL_QUERY_SIZE;
+    }
+
+protected:
+    /// Returns true when querying the counter may potentially block.
+    bool WaitPending() const noexcept {
+        return counter && counter->WaitPending();
+    }
+
+private:
+    static constexpr std::size_t SMALL_QUERY_SIZE = 8;   // Query size without timestamp.
+    static constexpr std::size_t LARGE_QUERY_SIZE = 16;  // Query size with timestamp.
+    static constexpr std::intptr_t TIMESTAMP_OFFSET = 8; // Timestamp offset in a large query.
+
+    VAddr cpu_addr;                       ///< Guest CPU address.
+    u8* host_ptr;                         ///< Writable host pointer.
+    std::shared_ptr<HostCounter> counter; ///< Host counter to query, owns the dependency tree.
+    std::optional<u64> timestamp;         ///< Timestamp to flush to guest memory.
+};
+
+} // namespace VideoCommon
diff --git a/src/video_core/rasterizer_interface.h b/src/video_core/rasterizer_interface.h
index c586cd6fe..f18eaf4bc 100644
--- a/src/video_core/rasterizer_interface.h
+++ b/src/video_core/rasterizer_interface.h
@@ -6,6 +6,7 @@
 
 #include <atomic>
 #include <functional>
+#include <optional>
 #include "common/common_types.h"
 #include "video_core/engines/fermi_2d.h"
 #include "video_core/gpu.h"
@@ -17,6 +18,11 @@ class MemoryManager;
 
 namespace VideoCore {
 
+enum class QueryType {
+    SamplesPassed,
+};
+constexpr std::size_t NumQueryTypes = 1;
+
 enum class LoadCallbackStage {
     Prepare,
     Decompile,
@@ -29,11 +35,8 @@ class RasterizerInterface {
 public:
     virtual ~RasterizerInterface() {}
 
-    /// Draw the current batch of vertex arrays
-    virtual bool DrawBatch(bool is_indexed) = 0;
-
-    /// Draw the current batch of multiple instances of vertex arrays
-    virtual bool DrawMultiBatch(bool is_indexed) = 0;
+    /// Dispatches a draw invocation
+    virtual void Draw(bool is_indexed, bool is_instanced) = 0;
 
     /// Clear the current framebuffer
     virtual void Clear() = 0;
@@ -41,6 +44,12 @@ public:
     /// Dispatches a compute shader invocation
     virtual void DispatchCompute(GPUVAddr code_addr) = 0;
 
+    /// Resets the counter of a query
+    virtual void ResetCounter(QueryType type) = 0;
+
+    /// Records a GPU query and caches it
+    virtual void Query(GPUVAddr gpu_addr, QueryType type, std::optional<u64> timestamp) = 0;
+
     /// Notify rasterizer that all caches should be flushed to Switch memory
     virtual void FlushAll() = 0;
 
diff --git a/src/video_core/renderer_opengl/gl_query_cache.cpp b/src/video_core/renderer_opengl/gl_query_cache.cpp
new file mode 100644
index 000000000..f12e9f55f
--- /dev/null
+++ b/src/video_core/renderer_opengl/gl_query_cache.cpp
@@ -0,0 +1,120 @@
+// Copyright 2019 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <algorithm>
+#include <cstring>
+#include <memory>
+#include <unordered_map>
+#include <utility>
+#include <vector>
+
+#include <glad/glad.h>
+
+#include "common/assert.h"
+#include "core/core.h"
+#include "video_core/engines/maxwell_3d.h"
+#include "video_core/memory_manager.h"
+#include "video_core/renderer_opengl/gl_query_cache.h"
+#include "video_core/renderer_opengl/gl_rasterizer.h"
+
+namespace OpenGL {
+
+namespace {
+
+constexpr std::array<GLenum, VideoCore::NumQueryTypes> QueryTargets = {GL_SAMPLES_PASSED};
+
+constexpr GLenum GetTarget(VideoCore::QueryType type) {
+    return QueryTargets[static_cast<std::size_t>(type)];
+}
+
+} // Anonymous namespace
+
+QueryCache::QueryCache(Core::System& system, RasterizerOpenGL& gl_rasterizer)
+    : VideoCommon::QueryCacheBase<
+          QueryCache, CachedQuery, CounterStream, HostCounter,
+          std::vector<OGLQuery>>{system,
+                                 static_cast<VideoCore::RasterizerInterface&>(gl_rasterizer)},
+      gl_rasterizer{gl_rasterizer} {}
+
+QueryCache::~QueryCache() = default;
+
+OGLQuery QueryCache::AllocateQuery(VideoCore::QueryType type) {
+    auto& reserve = query_pools[static_cast<std::size_t>(type)];
+    OGLQuery query;
+    if (reserve.empty()) {
+        query.Create(GetTarget(type));
+        return query;
+    }
+
+    query = std::move(reserve.back());
+    reserve.pop_back();
+    return query;
+}
+
+void QueryCache::Reserve(VideoCore::QueryType type, OGLQuery&& query) {
+    query_pools[static_cast<std::size_t>(type)].push_back(std::move(query));
+}
+
+bool QueryCache::AnyCommandQueued() const noexcept {
+    return gl_rasterizer.AnyCommandQueued();
+}
+
+HostCounter::HostCounter(QueryCache& cache, std::shared_ptr<HostCounter> dependency,
+                         VideoCore::QueryType type)
+    : VideoCommon::HostCounterBase<QueryCache, HostCounter>{std::move(dependency)}, cache{cache},
+      type{type}, query{cache.AllocateQuery(type)} {
+    glBeginQuery(GetTarget(type), query.handle);
+}
+
+HostCounter::~HostCounter() {
+    cache.Reserve(type, std::move(query));
+}
+
+void HostCounter::EndQuery() {
+    if (!cache.AnyCommandQueued()) {
+        // There are chances a query waited on without commands (glDraw, glClear, glDispatch). Not
+        // having any of these causes a lock. glFlush is considered a command, so we can safely wait
+        // for this. Insert to the OpenGL command stream a flush.
+        glFlush();
+    }
+    glEndQuery(GetTarget(type));
+}
+
+u64 HostCounter::BlockingQuery() const {
+    GLint64 value;
+    glGetQueryObjecti64v(query.handle, GL_QUERY_RESULT, &value);
+    return static_cast<u64>(value);
+}
+
+CachedQuery::CachedQuery(QueryCache& cache, VideoCore::QueryType type, VAddr cpu_addr, u8* host_ptr)
+    : VideoCommon::CachedQueryBase<HostCounter>{cpu_addr, host_ptr}, cache{&cache}, type{type} {}
+
+CachedQuery::CachedQuery(CachedQuery&& rhs) noexcept
+    : VideoCommon::CachedQueryBase<HostCounter>(std::move(rhs)), cache{rhs.cache}, type{rhs.type} {}
+
+CachedQuery& CachedQuery::operator=(CachedQuery&& rhs) noexcept {
+    VideoCommon::CachedQueryBase<HostCounter>::operator=(std::move(rhs));
+    cache = rhs.cache;
+    type = rhs.type;
+    return *this;
+}
+
+void CachedQuery::Flush() {
+    // Waiting for a query while another query of the same target is enabled locks Nvidia's driver.
+    // To avoid this disable and re-enable keeping the dependency stream.
+    // But we only have to do this if we have pending waits to be done.
+    auto& stream = cache->Stream(type);
+    const bool slice_counter = WaitPending() && stream.IsEnabled();
+    if (slice_counter) {
+        stream.Update(false);
+    }
+
+    VideoCommon::CachedQueryBase<HostCounter>::Flush();
+
+    if (slice_counter) {
+        stream.Update(true);
+    }
+}
+
+} // namespace OpenGL
diff --git a/src/video_core/renderer_opengl/gl_query_cache.h b/src/video_core/renderer_opengl/gl_query_cache.h
new file mode 100644
index 000000000..d8e7052a1
--- /dev/null
+++ b/src/video_core/renderer_opengl/gl_query_cache.h
@@ -0,0 +1,78 @@
+// Copyright 2019 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <array>
+#include <memory>
+#include <vector>
+
+#include "common/common_types.h"
+#include "video_core/query_cache.h"
+#include "video_core/rasterizer_interface.h"
+#include "video_core/renderer_opengl/gl_resource_manager.h"
+
+namespace Core {
+class System;
+}
+
+namespace OpenGL {
+
+class CachedQuery;
+class HostCounter;
+class QueryCache;
+class RasterizerOpenGL;
+
+using CounterStream = VideoCommon::CounterStreamBase<QueryCache, HostCounter>;
+
+class QueryCache final : public VideoCommon::QueryCacheBase<QueryCache, CachedQuery, CounterStream,
+                                                            HostCounter, std::vector<OGLQuery>> {
+public:
+    explicit QueryCache(Core::System& system, RasterizerOpenGL& rasterizer);
+    ~QueryCache();
+
+    OGLQuery AllocateQuery(VideoCore::QueryType type);
+
+    void Reserve(VideoCore::QueryType type, OGLQuery&& query);
+
+    bool AnyCommandQueued() const noexcept;
+
+private:
+    RasterizerOpenGL& gl_rasterizer;
+};
+
+class HostCounter final : public VideoCommon::HostCounterBase<QueryCache, HostCounter> {
+public:
+    explicit HostCounter(QueryCache& cache, std::shared_ptr<HostCounter> dependency,
+                         VideoCore::QueryType type);
+    ~HostCounter();
+
+    void EndQuery();
+
+private:
+    u64 BlockingQuery() const override;
+
+    QueryCache& cache;
+    const VideoCore::QueryType type;
+    OGLQuery query;
+};
+
+class CachedQuery final : public VideoCommon::CachedQueryBase<HostCounter> {
+public:
+    explicit CachedQuery(QueryCache& cache, VideoCore::QueryType type, VAddr cpu_addr,
+                         u8* host_ptr);
+    CachedQuery(CachedQuery&& rhs) noexcept;
+    CachedQuery(const CachedQuery&) = delete;
+
+    CachedQuery& operator=(CachedQuery&& rhs) noexcept;
+    CachedQuery& operator=(const CachedQuery&) = delete;
+
+    void Flush() override;
+
+private:
+    QueryCache* cache;
+    VideoCore::QueryType type;
+};
+
+} // namespace OpenGL
diff --git a/src/video_core/renderer_opengl/gl_rasterizer.cpp b/src/video_core/renderer_opengl/gl_rasterizer.cpp
index b0eb14c8b..e1965fb21 100644
--- a/src/video_core/renderer_opengl/gl_rasterizer.cpp
+++ b/src/video_core/renderer_opengl/gl_rasterizer.cpp
@@ -25,6 +25,7 @@
 #include "video_core/engines/maxwell_3d.h"
 #include "video_core/engines/shader_type.h"
 #include "video_core/memory_manager.h"
+#include "video_core/renderer_opengl/gl_query_cache.h"
 #include "video_core/renderer_opengl/gl_rasterizer.h"
 #include "video_core/renderer_opengl/gl_shader_cache.h"
 #include "video_core/renderer_opengl/gl_shader_gen.h"
@@ -92,8 +93,8 @@ std::size_t GetConstBufferSize(const Tegra::Engines::ConstBufferInfo& buffer,
 RasterizerOpenGL::RasterizerOpenGL(Core::System& system, Core::Frontend::EmuWindow& emu_window,
                                    ScreenInfo& info)
     : RasterizerAccelerated{system.Memory()}, texture_cache{system, *this, device},
-      shader_cache{*this, system, emu_window, device}, system{system}, screen_info{info},
-      buffer_cache{*this, system, device, STREAM_BUFFER_SIZE} {
+      shader_cache{*this, system, emu_window, device}, query_cache{system, *this}, system{system},
+      screen_info{info}, buffer_cache{*this, system, device, STREAM_BUFFER_SIZE} {
     shader_program_manager = std::make_unique<GLShader::ProgramManager>();
     state.draw.shader_program = 0;
     state.Apply();
@@ -541,11 +542,16 @@ void RasterizerOpenGL::Clear() {
     } else if (use_stencil) {
         glClearBufferiv(GL_STENCIL, 0, &regs.clear_stencil);
     }
+
+    ++num_queued_commands;
 }
 
 void RasterizerOpenGL::Draw(bool is_indexed, bool is_instanced) {
     MICROPROFILE_SCOPE(OpenGL_Drawing);
     auto& gpu = system.GPU().Maxwell3D();
+    const auto& regs = gpu.regs;
+
+    query_cache.UpdateCounters();
 
     SyncRasterizeEnable(state);
     SyncColorMask();
@@ -611,7 +617,7 @@ void RasterizerOpenGL::Draw(bool is_indexed, bool is_instanced) {
 
     // Setup shaders and their used resources.
     texture_cache.GuardSamplers(true);
-    const auto primitive_mode = MaxwellToGL::PrimitiveTopology(gpu.regs.draw.topology);
+    const GLenum primitive_mode = MaxwellToGL::PrimitiveTopology(gpu.regs.draw.topology);
     SetupShaders(primitive_mode);
     texture_cache.GuardSamplers(false);
 
@@ -638,35 +644,47 @@ void RasterizerOpenGL::Draw(bool is_indexed, bool is_instanced) {
         glTextureBarrier();
     }
 
+    ++num_queued_commands;
+
     const GLuint base_instance = static_cast<GLuint>(gpu.regs.vb_base_instance);
     const GLsizei num_instances =
         static_cast<GLsizei>(is_instanced ? gpu.mme_draw.instance_count : 1);
     if (is_indexed) {
-        const GLenum index_format = MaxwellToGL::IndexFormat(gpu.regs.index_array.format);
         const GLint base_vertex = static_cast<GLint>(gpu.regs.vb_element_base);
         const GLsizei num_vertices = static_cast<GLsizei>(gpu.regs.index_array.count);
-        glDrawElementsInstancedBaseVertexBaseInstance(
-            primitive_mode, num_vertices, index_format,
-            reinterpret_cast<const void*>(index_buffer_offset), num_instances, base_vertex,
-            base_instance);
+        const GLvoid* offset = reinterpret_cast<const GLvoid*>(index_buffer_offset);
+        const GLenum format = MaxwellToGL::IndexFormat(gpu.regs.index_array.format);
+        if (num_instances == 1 && base_instance == 0 && base_vertex == 0) {
+            glDrawElements(primitive_mode, num_vertices, format, offset);
+        } else if (num_instances == 1 && base_instance == 0) {
+            glDrawElementsBaseVertex(primitive_mode, num_vertices, format, offset, base_vertex);
+        } else if (base_vertex == 0 && base_instance == 0) {
+            glDrawElementsInstanced(primitive_mode, num_vertices, format, offset, num_instances);
+        } else if (base_vertex == 0) {
+            glDrawElementsInstancedBaseInstance(primitive_mode, num_vertices, format, offset,
+                                                num_instances, base_instance);
+        } else if (base_instance == 0) {
+            glDrawElementsInstancedBaseVertex(primitive_mode, num_vertices, format, offset,
+                                              num_instances, base_vertex);
+        } else {
+            glDrawElementsInstancedBaseVertexBaseInstance(primitive_mode, num_vertices, format,
+                                                          offset, num_instances, base_vertex,
+                                                          base_instance);
+        }
     } else {
         const GLint base_vertex = static_cast<GLint>(gpu.regs.vertex_buffer.first);
         const GLsizei num_vertices = static_cast<GLsizei>(gpu.regs.vertex_buffer.count);
-        glDrawArraysInstancedBaseInstance(primitive_mode, base_vertex, num_vertices, num_instances,
-                                          base_instance);
+        if (num_instances == 1 && base_instance == 0) {
+            glDrawArrays(primitive_mode, base_vertex, num_vertices);
+        } else if (base_instance == 0) {
+            glDrawArraysInstanced(primitive_mode, base_vertex, num_vertices, num_instances);
+        } else {
+            glDrawArraysInstancedBaseInstance(primitive_mode, base_vertex, num_vertices,
+                                              num_instances, base_instance);
+        }
     }
 }
 
-bool RasterizerOpenGL::DrawBatch(bool is_indexed) {
-    Draw(is_indexed, false);
-    return true;
-}
-
-bool RasterizerOpenGL::DrawMultiBatch(bool is_indexed) {
-    Draw(is_indexed, true);
-    return true;
-}
-
 void RasterizerOpenGL::DispatchCompute(GPUVAddr code_addr) {
     if (device.HasBrokenCompute()) {
         return;
@@ -707,6 +725,16 @@ void RasterizerOpenGL::DispatchCompute(GPUVAddr code_addr) {
     state.ApplyProgramPipeline();
 
     glDispatchCompute(launch_desc.grid_dim_x, launch_desc.grid_dim_y, launch_desc.grid_dim_z);
+    ++num_queued_commands;
+}
+
+void RasterizerOpenGL::ResetCounter(VideoCore::QueryType type) {
+    query_cache.ResetCounter(type);
+}
+
+void RasterizerOpenGL::Query(GPUVAddr gpu_addr, VideoCore::QueryType type,
+                             std::optional<u64> timestamp) {
+    query_cache.Query(gpu_addr, type, timestamp);
 }
 
 void RasterizerOpenGL::FlushAll() {}
@@ -718,6 +746,7 @@ void RasterizerOpenGL::FlushRegion(CacheAddr addr, u64 size) {
     }
     texture_cache.FlushRegion(addr, size);
     buffer_cache.FlushRegion(addr, size);
+    query_cache.FlushRegion(addr, size);
 }
 
 void RasterizerOpenGL::InvalidateRegion(CacheAddr addr, u64 size) {
@@ -728,6 +757,7 @@ void RasterizerOpenGL::InvalidateRegion(CacheAddr addr, u64 size) {
     texture_cache.InvalidateRegion(addr, size);
     shader_cache.InvalidateRegion(addr, size);
     buffer_cache.InvalidateRegion(addr, size);
+    query_cache.InvalidateRegion(addr, size);
 }
 
 void RasterizerOpenGL::FlushAndInvalidateRegion(CacheAddr addr, u64 size) {
@@ -738,10 +768,18 @@ void RasterizerOpenGL::FlushAndInvalidateRegion(CacheAddr addr, u64 size) {
 }
 
 void RasterizerOpenGL::FlushCommands() {
+    // Only flush when we have commands queued to OpenGL.
+    if (num_queued_commands == 0) {
+        return;
+    }
+    num_queued_commands = 0;
     glFlush();
 }
 
 void RasterizerOpenGL::TickFrame() {
+    // Ticking a frame means that buffers will be swapped, calling glFlush implicitly.
+    num_queued_commands = 0;
+
     buffer_cache.TickFrame();
 }
 
diff --git a/src/video_core/renderer_opengl/gl_rasterizer.h b/src/video_core/renderer_opengl/gl_rasterizer.h
index 0501f3828..68abe9a21 100644
--- a/src/video_core/renderer_opengl/gl_rasterizer.h
+++ b/src/video_core/renderer_opengl/gl_rasterizer.h
@@ -24,6 +24,7 @@
 #include "video_core/renderer_opengl/gl_buffer_cache.h"
 #include "video_core/renderer_opengl/gl_device.h"
 #include "video_core/renderer_opengl/gl_framebuffer_cache.h"
+#include "video_core/renderer_opengl/gl_query_cache.h"
 #include "video_core/renderer_opengl/gl_resource_manager.h"
 #include "video_core/renderer_opengl/gl_sampler_cache.h"
 #include "video_core/renderer_opengl/gl_shader_cache.h"
@@ -57,10 +58,11 @@ public:
                               ScreenInfo& info);
     ~RasterizerOpenGL() override;
 
-    bool DrawBatch(bool is_indexed) override;
-    bool DrawMultiBatch(bool is_indexed) override;
+    void Draw(bool is_indexed, bool is_instanced) override;
     void Clear() override;
     void DispatchCompute(GPUVAddr code_addr) override;
+    void ResetCounter(VideoCore::QueryType type) override;
+    void Query(GPUVAddr gpu_addr, VideoCore::QueryType type, std::optional<u64> timestamp) override;
     void FlushAll() override;
     void FlushRegion(CacheAddr addr, u64 size) override;
     void InvalidateRegion(CacheAddr addr, u64 size) override;
@@ -75,6 +77,11 @@ public:
     void LoadDiskResources(const std::atomic_bool& stop_loading,
                            const VideoCore::DiskResourceLoadCallback& callback) override;
 
+    /// Returns true when there are commands queued to the OpenGL server.
+    bool AnyCommandQueued() const {
+        return num_queued_commands > 0;
+    }
+
 private:
     /// Configures the color and depth framebuffer states.
     void ConfigureFramebuffers();
@@ -102,9 +109,6 @@ private:
     void SetupGlobalMemory(u32 binding, const GLShader::GlobalMemoryEntry& entry, GPUVAddr gpu_addr,
                            std::size_t size);
 
-    /// Syncs all the state, shaders, render targets and textures setting before a draw call.
-    void Draw(bool is_indexed, bool is_instanced);
-
     /// Configures the current textures to use for the draw command.
     void SetupDrawTextures(std::size_t stage_index, const Shader& shader);
 
@@ -180,10 +184,23 @@ private:
     /// Syncs the alpha test state to match the guest state
     void SyncAlphaTest();
 
-    /// Check for extension that are not strictly required
-    /// but are needed for correct emulation
+    /// Check for extension that are not strictly required but are needed for correct emulation
     void CheckExtensions();
 
+    std::size_t CalculateVertexArraysSize() const;
+
+    std::size_t CalculateIndexBufferSize() const;
+
+    /// Updates and returns a vertex array object representing current vertex format
+    GLuint SetupVertexFormat();
+
+    void SetupVertexBuffer(GLuint vao);
+    void SetupVertexInstances(GLuint vao);
+
+    GLintptr SetupIndexBuffer();
+
+    void SetupShaders(GLenum primitive_mode);
+
     const Device device;
     OpenGLState state;
 
@@ -191,6 +208,7 @@ private:
     ShaderCacheOpenGL shader_cache;
     SamplerCacheOpenGL sampler_cache;
     FramebufferCacheOpenGL framebuffer_cache;
+    QueryCache query_cache;
 
     Core::System& system;
     ScreenInfo& screen_info;
@@ -208,19 +226,8 @@ private:
     BindBuffersRangePushBuffer bind_ubo_pushbuffer{GL_UNIFORM_BUFFER};
     BindBuffersRangePushBuffer bind_ssbo_pushbuffer{GL_SHADER_STORAGE_BUFFER};
 
-    std::size_t CalculateVertexArraysSize() const;
-
-    std::size_t CalculateIndexBufferSize() const;
-
-    /// Updates and returns a vertex array object representing current vertex format
-    GLuint SetupVertexFormat();
-
-    void SetupVertexBuffer(GLuint vao);
-    void SetupVertexInstances(GLuint vao);
-
-    GLintptr SetupIndexBuffer();
-
-    void SetupShaders(GLenum primitive_mode);
+    /// Number of commands queued to the OpenGL driver. Reseted on flush.
+    std::size_t num_queued_commands = 0;
 };
 
 } // namespace OpenGL
diff --git a/src/video_core/renderer_opengl/gl_resource_manager.cpp b/src/video_core/renderer_opengl/gl_resource_manager.cpp
index 5c96c1d46..f0ddfb276 100644
--- a/src/video_core/renderer_opengl/gl_resource_manager.cpp
+++ b/src/video_core/renderer_opengl/gl_resource_manager.cpp
@@ -207,4 +207,21 @@ void OGLFramebuffer::Release() {
     handle = 0;
 }
 
+void OGLQuery::Create(GLenum target) {
+    if (handle != 0)
+        return;
+
+    MICROPROFILE_SCOPE(OpenGL_ResourceCreation);
+    glCreateQueries(target, 1, &handle);
+}
+
+void OGLQuery::Release() {
+    if (handle == 0)
+        return;
+
+    MICROPROFILE_SCOPE(OpenGL_ResourceDeletion);
+    glDeleteQueries(1, &handle);
+    handle = 0;
+}
+
 } // namespace OpenGL
diff --git a/src/video_core/renderer_opengl/gl_resource_manager.h b/src/video_core/renderer_opengl/gl_resource_manager.h
index 3a85a1d4c..514d1d165 100644
--- a/src/video_core/renderer_opengl/gl_resource_manager.h
+++ b/src/video_core/renderer_opengl/gl_resource_manager.h
@@ -266,4 +266,29 @@ public:
     GLuint handle = 0;
 };
 
+class OGLQuery : private NonCopyable {
+public:
+    OGLQuery() = default;
+
+    OGLQuery(OGLQuery&& o) noexcept : handle(std::exchange(o.handle, 0)) {}
+
+    ~OGLQuery() {
+        Release();
+    }
+
+    OGLQuery& operator=(OGLQuery&& o) noexcept {
+        Release();
+        handle = std::exchange(o.handle, 0);
+        return *this;
+    }
+
+    /// Creates a new internal OpenGL resource and stores the handle
+    void Create(GLenum target);
+
+    /// Deletes the internal OpenGL resource
+    void Release();
+
+    GLuint handle = 0;
+};
+
 } // namespace OpenGL
diff --git a/src/video_core/renderer_vulkan/vk_device.cpp b/src/video_core/renderer_vulkan/vk_device.cpp
index 0b3fdef1b..3a77aced9 100644
--- a/src/video_core/renderer_vulkan/vk_device.cpp
+++ b/src/video_core/renderer_vulkan/vk_device.cpp
@@ -104,6 +104,7 @@ bool VKDevice::Create(const vk::DispatchLoaderDynamic& dldi, vk::Instance instan
     features.depthBiasClamp = true;
     features.geometryShader = true;
     features.tessellationShader = true;
+    features.occlusionQueryPrecise = true;
     features.fragmentStoresAndAtomics = true;
     features.shaderImageGatherExtended = true;
     features.shaderStorageImageWriteWithoutFormat = true;
@@ -117,6 +118,10 @@ bool VKDevice::Create(const vk::DispatchLoaderDynamic& dldi, vk::Instance instan
     bit8_storage.uniformAndStorageBuffer8BitAccess = true;
     SetNext(next, bit8_storage);
 
+    vk::PhysicalDeviceHostQueryResetFeaturesEXT host_query_reset;
+    host_query_reset.hostQueryReset = true;
+    SetNext(next, host_query_reset);
+
     vk::PhysicalDeviceFloat16Int8FeaturesKHR float16_int8;
     if (is_float16_supported) {
         float16_int8.shaderFloat16 = true;
@@ -273,6 +278,7 @@ bool VKDevice::IsSuitable(const vk::DispatchLoaderDynamic& dldi, vk::PhysicalDev
         VK_EXT_VERTEX_ATTRIBUTE_DIVISOR_EXTENSION_NAME,
         VK_EXT_SHADER_SUBGROUP_BALLOT_EXTENSION_NAME,
         VK_EXT_SHADER_SUBGROUP_VOTE_EXTENSION_NAME,
+        VK_EXT_HOST_QUERY_RESET_EXTENSION_NAME,
     };
     std::bitset<required_extensions.size()> available_extensions{};
 
@@ -340,6 +346,7 @@ bool VKDevice::IsSuitable(const vk::DispatchLoaderDynamic& dldi, vk::PhysicalDev
         std::make_pair(features.depthBiasClamp, "depthBiasClamp"),
         std::make_pair(features.geometryShader, "geometryShader"),
         std::make_pair(features.tessellationShader, "tessellationShader"),
+        std::make_pair(features.occlusionQueryPrecise, "occlusionQueryPrecise"),
         std::make_pair(features.fragmentStoresAndAtomics, "fragmentStoresAndAtomics"),
         std::make_pair(features.shaderImageGatherExtended, "shaderImageGatherExtended"),
         std::make_pair(features.shaderStorageImageWriteWithoutFormat,
@@ -376,7 +383,7 @@ std::vector<const char*> VKDevice::LoadExtensions(const vk::DispatchLoaderDynami
         }
     };
 
-    extensions.reserve(13);
+    extensions.reserve(14);
     extensions.push_back(VK_KHR_SWAPCHAIN_EXTENSION_NAME);
     extensions.push_back(VK_KHR_16BIT_STORAGE_EXTENSION_NAME);
     extensions.push_back(VK_KHR_8BIT_STORAGE_EXTENSION_NAME);
@@ -384,6 +391,7 @@ std::vector<const char*> VKDevice::LoadExtensions(const vk::DispatchLoaderDynami
     extensions.push_back(VK_EXT_VERTEX_ATTRIBUTE_DIVISOR_EXTENSION_NAME);
     extensions.push_back(VK_EXT_SHADER_SUBGROUP_BALLOT_EXTENSION_NAME);
     extensions.push_back(VK_EXT_SHADER_SUBGROUP_VOTE_EXTENSION_NAME);
+    extensions.push_back(VK_EXT_HOST_QUERY_RESET_EXTENSION_NAME);
 
     [[maybe_unused]] const bool nsight =
         std::getenv("NVTX_INJECTION64_PATH") || std::getenv("NSIGHT_LAUNCHED");
diff --git a/src/video_core/renderer_vulkan/vk_query_cache.cpp b/src/video_core/renderer_vulkan/vk_query_cache.cpp
new file mode 100644
index 000000000..ffbf60dda
--- /dev/null
+++ b/src/video_core/renderer_vulkan/vk_query_cache.cpp
@@ -0,0 +1,122 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <algorithm>
+#include <cstddef>
+#include <cstdint>
+#include <utility>
+#include <vector>
+
+#include "video_core/renderer_vulkan/declarations.h"
+#include "video_core/renderer_vulkan/vk_device.h"
+#include "video_core/renderer_vulkan/vk_query_cache.h"
+#include "video_core/renderer_vulkan/vk_resource_manager.h"
+#include "video_core/renderer_vulkan/vk_scheduler.h"
+
+namespace Vulkan {
+
+namespace {
+
+constexpr std::array QUERY_TARGETS = {vk::QueryType::eOcclusion};
+
+constexpr vk::QueryType GetTarget(VideoCore::QueryType type) {
+    return QUERY_TARGETS[static_cast<std::size_t>(type)];
+}
+
+} // Anonymous namespace
+
+QueryPool::QueryPool() : VKFencedPool{GROW_STEP} {}
+
+QueryPool::~QueryPool() = default;
+
+void QueryPool::Initialize(const VKDevice& device_, VideoCore::QueryType type_) {
+    device = &device_;
+    type = type_;
+}
+
+std::pair<vk::QueryPool, std::uint32_t> QueryPool::Commit(VKFence& fence) {
+    std::size_t index;
+    do {
+        index = CommitResource(fence);
+    } while (usage[index]);
+    usage[index] = true;
+
+    return {*pools[index / GROW_STEP], static_cast<std::uint32_t>(index % GROW_STEP)};
+}
+
+void QueryPool::Allocate(std::size_t begin, std::size_t end) {
+    usage.resize(end);
+
+    const auto dev = device->GetLogical();
+    const u32 size = static_cast<u32>(end - begin);
+    const vk::QueryPoolCreateInfo query_pool_ci({}, GetTarget(type), size, {});
+    pools.push_back(dev.createQueryPoolUnique(query_pool_ci, nullptr, device->GetDispatchLoader()));
+}
+
+void QueryPool::Reserve(std::pair<vk::QueryPool, std::uint32_t> query) {
+    const auto it =
+        std::find_if(std::begin(pools), std::end(pools),
+                     [query_pool = query.first](auto& pool) { return query_pool == *pool; });
+    ASSERT(it != std::end(pools));
+
+    const std::ptrdiff_t pool_index = std::distance(std::begin(pools), it);
+    usage[pool_index * GROW_STEP + static_cast<std::ptrdiff_t>(query.second)] = false;
+}
+
+VKQueryCache::VKQueryCache(Core::System& system, VideoCore::RasterizerInterface& rasterizer,
+                           const VKDevice& device, VKScheduler& scheduler)
+    : VideoCommon::QueryCacheBase<VKQueryCache, CachedQuery, CounterStream, HostCounter,
+                                  QueryPool>{system, rasterizer},
+      device{device}, scheduler{scheduler} {
+    for (std::size_t i = 0; i < static_cast<std::size_t>(VideoCore::NumQueryTypes); ++i) {
+        query_pools[i].Initialize(device, static_cast<VideoCore::QueryType>(i));
+    }
+}
+
+VKQueryCache::~VKQueryCache() = default;
+
+std::pair<vk::QueryPool, std::uint32_t> VKQueryCache::AllocateQuery(VideoCore::QueryType type) {
+    return query_pools[static_cast<std::size_t>(type)].Commit(scheduler.GetFence());
+}
+
+void VKQueryCache::Reserve(VideoCore::QueryType type,
+                           std::pair<vk::QueryPool, std::uint32_t> query) {
+    query_pools[static_cast<std::size_t>(type)].Reserve(query);
+}
+
+HostCounter::HostCounter(VKQueryCache& cache, std::shared_ptr<HostCounter> dependency,
+                         VideoCore::QueryType type)
+    : VideoCommon::HostCounterBase<VKQueryCache, HostCounter>{std::move(dependency)}, cache{cache},
+      type{type}, query{cache.AllocateQuery(type)}, ticks{cache.Scheduler().Ticks()} {
+    const auto dev = cache.Device().GetLogical();
+    cache.Scheduler().Record([dev, query = query](vk::CommandBuffer cmdbuf, auto& dld) {
+        dev.resetQueryPoolEXT(query.first, query.second, 1, dld);
+        cmdbuf.beginQuery(query.first, query.second, vk::QueryControlFlagBits::ePrecise, dld);
+    });
+}
+
+HostCounter::~HostCounter() {
+    cache.Reserve(type, query);
+}
+
+void HostCounter::EndQuery() {
+    cache.Scheduler().Record([query = query](auto cmdbuf, auto& dld) {
+        cmdbuf.endQuery(query.first, query.second, dld);
+    });
+}
+
+u64 HostCounter::BlockingQuery() const {
+    if (ticks >= cache.Scheduler().Ticks()) {
+        cache.Scheduler().Flush();
+    }
+
+    const auto dev = cache.Device().GetLogical();
+    const auto& dld = cache.Device().GetDispatchLoader();
+    u64 value;
+    dev.getQueryPoolResults(query.first, query.second, 1, sizeof(value), &value, sizeof(value),
+                            vk::QueryResultFlagBits::e64 | vk::QueryResultFlagBits::eWait, dld);
+    return value;
+}
+
+} // namespace Vulkan
diff --git a/src/video_core/renderer_vulkan/vk_query_cache.h b/src/video_core/renderer_vulkan/vk_query_cache.h
new file mode 100644
index 000000000..c3092ee96
--- /dev/null
+++ b/src/video_core/renderer_vulkan/vk_query_cache.h
@@ -0,0 +1,104 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <cstddef>
+#include <cstdint>
+#include <memory>
+#include <utility>
+#include <vector>
+
+#include "common/common_types.h"
+#include "video_core/query_cache.h"
+#include "video_core/renderer_vulkan/declarations.h"
+#include "video_core/renderer_vulkan/vk_resource_manager.h"
+
+namespace VideoCore {
+class RasterizerInterface;
+}
+
+namespace Vulkan {
+
+class CachedQuery;
+class HostCounter;
+class VKDevice;
+class VKQueryCache;
+class VKScheduler;
+
+using CounterStream = VideoCommon::CounterStreamBase<VKQueryCache, HostCounter>;
+
+class QueryPool final : public VKFencedPool {
+public:
+    explicit QueryPool();
+    ~QueryPool() override;
+
+    void Initialize(const VKDevice& device, VideoCore::QueryType type);
+
+    std::pair<vk::QueryPool, std::uint32_t> Commit(VKFence& fence);
+
+    void Reserve(std::pair<vk::QueryPool, std::uint32_t> query);
+
+protected:
+    void Allocate(std::size_t begin, std::size_t end) override;
+
+private:
+    static constexpr std::size_t GROW_STEP = 512;
+
+    const VKDevice* device = nullptr;
+    VideoCore::QueryType type = {};
+
+    std::vector<UniqueQueryPool> pools;
+    std::vector<bool> usage;
+};
+
+class VKQueryCache final
+    : public VideoCommon::QueryCacheBase<VKQueryCache, CachedQuery, CounterStream, HostCounter,
+                                         QueryPool> {
+public:
+    explicit VKQueryCache(Core::System& system, VideoCore::RasterizerInterface& rasterizer,
+                          const VKDevice& device, VKScheduler& scheduler);
+    ~VKQueryCache();
+
+    std::pair<vk::QueryPool, std::uint32_t> AllocateQuery(VideoCore::QueryType type);
+
+    void Reserve(VideoCore::QueryType type, std::pair<vk::QueryPool, std::uint32_t> query);
+
+    const VKDevice& Device() const noexcept {
+        return device;
+    }
+
+    VKScheduler& Scheduler() const noexcept {
+        return scheduler;
+    }
+
+private:
+    const VKDevice& device;
+    VKScheduler& scheduler;
+};
+
+class HostCounter final : public VideoCommon::HostCounterBase<VKQueryCache, HostCounter> {
+public:
+    explicit HostCounter(VKQueryCache& cache, std::shared_ptr<HostCounter> dependency,
+                         VideoCore::QueryType type);
+    ~HostCounter();
+
+    void EndQuery();
+
+private:
+    u64 BlockingQuery() const override;
+
+    VKQueryCache& cache;
+    const VideoCore::QueryType type;
+    const std::pair<vk::QueryPool, std::uint32_t> query;
+    const u64 ticks;
+};
+
+class CachedQuery : public VideoCommon::CachedQueryBase<HostCounter> {
+public:
+    explicit CachedQuery(VKQueryCache&, VideoCore::QueryType, VAddr cpu_addr, u8* host_ptr)
+        : VideoCommon::CachedQueryBase<HostCounter>{cpu_addr, host_ptr} {}
+};
+
+} // namespace Vulkan
diff --git a/src/video_core/renderer_vulkan/vk_rasterizer.cpp b/src/video_core/renderer_vulkan/vk_rasterizer.cpp
index aada38702..31c078f6a 100644
--- a/src/video_core/renderer_vulkan/vk_rasterizer.cpp
+++ b/src/video_core/renderer_vulkan/vk_rasterizer.cpp
@@ -289,25 +289,19 @@ RasterizerVulkan::RasterizerVulkan(Core::System& system, Core::Frontend::EmuWind
                     staging_pool),
       pipeline_cache(system, *this, device, scheduler, descriptor_pool, update_descriptor_queue),
       buffer_cache(*this, system, device, memory_manager, scheduler, staging_pool),
-      sampler_cache(device) {}
-
-RasterizerVulkan::~RasterizerVulkan() = default;
-
-bool RasterizerVulkan::DrawBatch(bool is_indexed) {
-    Draw(is_indexed, false);
-    return true;
+      sampler_cache(device), query_cache(system, *this, device, scheduler) {
+    scheduler.SetQueryCache(query_cache);
 }
 
-bool RasterizerVulkan::DrawMultiBatch(bool is_indexed) {
-    Draw(is_indexed, true);
-    return true;
-}
+RasterizerVulkan::~RasterizerVulkan() = default;
 
 void RasterizerVulkan::Draw(bool is_indexed, bool is_instanced) {
     MICROPROFILE_SCOPE(Vulkan_Drawing);
 
     FlushWork();
 
+    query_cache.UpdateCounters();
+
     const auto& gpu = system.GPU().Maxwell3D();
     GraphicsPipelineCacheKey key{GetFixedPipelineState(gpu.regs)};
 
@@ -362,6 +356,8 @@ void RasterizerVulkan::Draw(bool is_indexed, bool is_instanced) {
 void RasterizerVulkan::Clear() {
     MICROPROFILE_SCOPE(Vulkan_Clearing);
 
+    query_cache.UpdateCounters();
+
     const auto& gpu = system.GPU().Maxwell3D();
     if (!system.GPU().Maxwell3D().ShouldExecute()) {
         return;
@@ -429,6 +425,8 @@ void RasterizerVulkan::DispatchCompute(GPUVAddr code_addr) {
     sampled_views.clear();
     image_views.clear();
 
+    query_cache.UpdateCounters();
+
     const auto& launch_desc = system.GPU().KeplerCompute().launch_description;
     const ComputePipelineCacheKey key{
         code_addr,
@@ -471,17 +469,28 @@ void RasterizerVulkan::DispatchCompute(GPUVAddr code_addr) {
     });
 }
 
+void RasterizerVulkan::ResetCounter(VideoCore::QueryType type) {
+    query_cache.ResetCounter(type);
+}
+
+void RasterizerVulkan::Query(GPUVAddr gpu_addr, VideoCore::QueryType type,
+                             std::optional<u64> timestamp) {
+    query_cache.Query(gpu_addr, type, timestamp);
+}
+
 void RasterizerVulkan::FlushAll() {}
 
 void RasterizerVulkan::FlushRegion(CacheAddr addr, u64 size) {
     texture_cache.FlushRegion(addr, size);
     buffer_cache.FlushRegion(addr, size);
+    query_cache.FlushRegion(addr, size);
 }
 
 void RasterizerVulkan::InvalidateRegion(CacheAddr addr, u64 size) {
     texture_cache.InvalidateRegion(addr, size);
     pipeline_cache.InvalidateRegion(addr, size);
     buffer_cache.InvalidateRegion(addr, size);
+    query_cache.InvalidateRegion(addr, size);
 }
 
 void RasterizerVulkan::FlushAndInvalidateRegion(CacheAddr addr, u64 size) {
diff --git a/src/video_core/renderer_vulkan/vk_rasterizer.h b/src/video_core/renderer_vulkan/vk_rasterizer.h
index 7be71e734..138903d60 100644
--- a/src/video_core/renderer_vulkan/vk_rasterizer.h
+++ b/src/video_core/renderer_vulkan/vk_rasterizer.h
@@ -24,6 +24,7 @@
 #include "video_core/renderer_vulkan/vk_descriptor_pool.h"
 #include "video_core/renderer_vulkan/vk_memory_manager.h"
 #include "video_core/renderer_vulkan/vk_pipeline_cache.h"
+#include "video_core/renderer_vulkan/vk_query_cache.h"
 #include "video_core/renderer_vulkan/vk_renderpass_cache.h"
 #include "video_core/renderer_vulkan/vk_resource_manager.h"
 #include "video_core/renderer_vulkan/vk_sampler_cache.h"
@@ -96,7 +97,7 @@ struct ImageView {
     vk::ImageLayout* layout = nullptr;
 };
 
-class RasterizerVulkan : public VideoCore::RasterizerAccelerated {
+class RasterizerVulkan final : public VideoCore::RasterizerAccelerated {
 public:
     explicit RasterizerVulkan(Core::System& system, Core::Frontend::EmuWindow& render_window,
                               VKScreenInfo& screen_info, const VKDevice& device,
@@ -104,10 +105,11 @@ public:
                               VKScheduler& scheduler);
     ~RasterizerVulkan() override;
 
-    bool DrawBatch(bool is_indexed) override;
-    bool DrawMultiBatch(bool is_indexed) override;
+    void Draw(bool is_indexed, bool is_instanced) override;
     void Clear() override;
     void DispatchCompute(GPUVAddr code_addr) override;
+    void ResetCounter(VideoCore::QueryType type) override;
+    void Query(GPUVAddr gpu_addr, VideoCore::QueryType type, std::optional<u64> timestamp) override;
     void FlushAll() override;
     void FlushRegion(CacheAddr addr, u64 size) override;
     void InvalidateRegion(CacheAddr addr, u64 size) override;
@@ -140,8 +142,6 @@ private:
 
     static constexpr std::size_t ZETA_TEXCEPTION_INDEX = 8;
 
-    void Draw(bool is_indexed, bool is_instanced);
-
     void FlushWork();
 
     Texceptions UpdateAttachments();
@@ -247,6 +247,7 @@ private:
     VKPipelineCache pipeline_cache;
     VKBufferCache buffer_cache;
     VKSamplerCache sampler_cache;
+    VKQueryCache query_cache;
 
     std::array<View, Maxwell::NumRenderTargets> color_attachments;
     View zeta_attachment;
diff --git a/src/video_core/renderer_vulkan/vk_scheduler.cpp b/src/video_core/renderer_vulkan/vk_scheduler.cpp
index d66133ad1..92bd6c344 100644
--- a/src/video_core/renderer_vulkan/vk_scheduler.cpp
+++ b/src/video_core/renderer_vulkan/vk_scheduler.cpp
@@ -6,6 +6,7 @@
 #include "common/microprofile.h"
 #include "video_core/renderer_vulkan/declarations.h"
 #include "video_core/renderer_vulkan/vk_device.h"
+#include "video_core/renderer_vulkan/vk_query_cache.h"
 #include "video_core/renderer_vulkan/vk_resource_manager.h"
 #include "video_core/renderer_vulkan/vk_scheduler.h"
 
@@ -139,6 +140,8 @@ void VKScheduler::SubmitExecution(vk::Semaphore semaphore) {
 }
 
 void VKScheduler::AllocateNewContext() {
+    ++ticks;
+
     std::unique_lock lock{mutex};
     current_fence = next_fence;
     next_fence = &resource_manager.CommitFence();
@@ -146,6 +149,10 @@ void VKScheduler::AllocateNewContext() {
     current_cmdbuf = resource_manager.CommitCommandBuffer(*current_fence);
     current_cmdbuf.begin({vk::CommandBufferUsageFlagBits::eOneTimeSubmit},
                          device.GetDispatchLoader());
+    // Enable counters once again. These are disabled when a command buffer is finished.
+    if (query_cache) {
+        query_cache->UpdateCounters();
+    }
 }
 
 void VKScheduler::InvalidateState() {
@@ -159,6 +166,7 @@ void VKScheduler::InvalidateState() {
 }
 
 void VKScheduler::EndPendingOperations() {
+    query_cache->DisableStreams();
     EndRenderPass();
 }
 
diff --git a/src/video_core/renderer_vulkan/vk_scheduler.h b/src/video_core/renderer_vulkan/vk_scheduler.h
index bcdffbba0..62fd7858b 100644
--- a/src/video_core/renderer_vulkan/vk_scheduler.h
+++ b/src/video_core/renderer_vulkan/vk_scheduler.h
@@ -4,6 +4,7 @@
 
 #pragma once
 
+#include <atomic>
 #include <condition_variable>
 #include <memory>
 #include <optional>
@@ -18,6 +19,7 @@ namespace Vulkan {
 
 class VKDevice;
 class VKFence;
+class VKQueryCache;
 class VKResourceManager;
 
 class VKFenceView {
@@ -67,6 +69,11 @@ public:
     /// Binds a pipeline to the current execution context.
     void BindGraphicsPipeline(vk::Pipeline pipeline);
 
+    /// Assigns the query cache.
+    void SetQueryCache(VKQueryCache& query_cache_) {
+        query_cache = &query_cache_;
+    }
+
     /// Returns true when viewports have been set in the current command buffer.
     bool TouchViewports() {
         return std::exchange(state.viewports, true);
@@ -112,6 +119,11 @@ public:
         return current_fence;
     }
 
+    /// Returns the current command buffer tick.
+    u64 Ticks() const {
+        return ticks;
+    }
+
 private:
     class Command {
     public:
@@ -205,6 +217,8 @@ private:
 
     const VKDevice& device;
     VKResourceManager& resource_manager;
+    VKQueryCache* query_cache = nullptr;
+
     vk::CommandBuffer current_cmdbuf;
     VKFence* current_fence = nullptr;
     VKFence* next_fence = nullptr;
@@ -227,6 +241,7 @@ private:
     Common::SPSCQueue<std::unique_ptr<CommandChunk>> chunk_reserve;
     std::mutex mutex;
     std::condition_variable cv;
+    std::atomic<u64> ticks = 0;
     bool quit = false;
 };
 
diff --git a/src/video_core/renderer_vulkan/vk_shader_decompiler.cpp b/src/video_core/renderer_vulkan/vk_shader_decompiler.cpp
index 24a658dce..f64f5da28 100644
--- a/src/video_core/renderer_vulkan/vk_shader_decompiler.cpp
+++ b/src/video_core/renderer_vulkan/vk_shader_decompiler.cpp
@@ -275,12 +275,14 @@ public:
         AddCapability(spv::Capability::ImageGatherExtended);
         AddCapability(spv::Capability::SampledBuffer);
         AddCapability(spv::Capability::StorageImageWriteWithoutFormat);
+        AddCapability(spv::Capability::DrawParameters);
         AddCapability(spv::Capability::SubgroupBallotKHR);
         AddCapability(spv::Capability::SubgroupVoteKHR);
         AddExtension("SPV_KHR_shader_ballot");
         AddExtension("SPV_KHR_subgroup_vote");
         AddExtension("SPV_KHR_storage_buffer_storage_class");
         AddExtension("SPV_KHR_variable_pointers");
+        AddExtension("SPV_KHR_shader_draw_parameters");
 
         if (ir.UsesViewportIndex()) {
             AddCapability(spv::Capability::MultiViewport);
@@ -492,9 +494,11 @@ private:
         interfaces.push_back(AddGlobalVariable(Name(out_vertex, "out_vertex")));
 
         // Declare input attributes
-        vertex_index = DeclareInputBuiltIn(spv::BuiltIn::VertexIndex, t_in_uint, "vertex_index");
+        vertex_index = DeclareInputBuiltIn(spv::BuiltIn::VertexIndex, t_in_int, "vertex_index");
         instance_index =
-            DeclareInputBuiltIn(spv::BuiltIn::InstanceIndex, t_in_uint, "instance_index");
+            DeclareInputBuiltIn(spv::BuiltIn::InstanceIndex, t_in_int, "instance_index");
+        base_vertex = DeclareInputBuiltIn(spv::BuiltIn::BaseVertex, t_in_int, "base_vertex");
+        base_instance = DeclareInputBuiltIn(spv::BuiltIn::BaseInstance, t_in_int, "base_instance");
     }
 
     void DeclareTessControl() {
@@ -1068,9 +1072,12 @@ private:
                     return {OpLoad(t_float, AccessElement(t_in_float, tess_coord, element)),
                             Type::Float};
                 case 2:
-                    return {OpLoad(t_uint, instance_index), Type::Uint};
+                    return {
+                        OpISub(t_int, OpLoad(t_int, instance_index), OpLoad(t_int, base_instance)),
+                        Type::Int};
                 case 3:
-                    return {OpLoad(t_uint, vertex_index), Type::Uint};
+                    return {OpISub(t_int, OpLoad(t_int, vertex_index), OpLoad(t_int, base_vertex)),
+                            Type::Int};
                 }
                 UNIMPLEMENTED_MSG("Unmanaged TessCoordInstanceIDVertexID element={}", element);
                 return {Constant(t_uint, 0U), Type::Uint};
@@ -2542,6 +2549,8 @@ private:
 
     Id instance_index{};
     Id vertex_index{};
+    Id base_instance{};
+    Id base_vertex{};
     std::array<Id, Maxwell::NumRenderTargets> frag_colors{};
     Id frag_depth{};
     Id frag_coord{};
diff --git a/src/video_core/shader/decode/conversion.cpp b/src/video_core/shader/decode/conversion.cpp
index 0eeb75559..6ead42070 100644
--- a/src/video_core/shader/decode/conversion.cpp
+++ b/src/video_core/shader/decode/conversion.cpp
@@ -83,14 +83,14 @@ u32 ShaderIR::DecodeConversion(NodeBlock& bb, u32 pc) {
 
         const bool input_signed = instr.conversion.is_input_signed;
 
-        if (instr.conversion.src_size == Register::Size::Byte) {
-            const u32 offset = static_cast<u32>(instr.conversion.int_src.selector) * 8;
-            if (offset > 0) {
-                value = SignedOperation(OperationCode::ILogicalShiftRight, input_signed,
-                                        std::move(value), Immediate(offset));
+        if (const u32 offset = static_cast<u32>(instr.conversion.int_src.selector); offset > 0) {
+            ASSERT(instr.conversion.src_size == Register::Size::Byte ||
+                   instr.conversion.src_size == Register::Size::Short);
+            if (instr.conversion.src_size == Register::Size::Short) {
+                ASSERT(offset == 0 || offset == 2);
             }
-        } else {
-            UNIMPLEMENTED_IF(instr.conversion.int_src.selector != 0);
+            value = SignedOperation(OperationCode::ILogicalShiftRight, input_signed,
+                                    std::move(value), Immediate(offset * 8));
         }
 
         value = ConvertIntegerSize(value, instr.conversion.src_size, input_signed);
diff --git a/src/video_core/shader/decode/texture.cpp b/src/video_core/shader/decode/texture.cpp
index 351c8c2f1..542636430 100644
--- a/src/video_core/shader/decode/texture.cpp
+++ b/src/video_core/shader/decode/texture.cpp
@@ -522,68 +522,53 @@ Node4 ShaderIR::GetTextureCode(Instruction instr, TextureType texture_type,
                                Node array, Node depth_compare, u32 bias_offset,
                                std::vector<Node> aoffi,
                                std::optional<Tegra::Shader::Register> bindless_reg) {
-    const auto is_array = static_cast<bool>(array);
-    const auto is_shadow = static_cast<bool>(depth_compare);
+    const bool is_array = array != nullptr;
+    const bool is_shadow = depth_compare != nullptr;
     const bool is_bindless = bindless_reg.has_value();
 
-    UNIMPLEMENTED_IF_MSG((texture_type == TextureType::Texture3D && (is_array || is_shadow)) ||
-                             (texture_type == TextureType::TextureCube && is_array && is_shadow),
-                         "This method is not supported.");
+    UNIMPLEMENTED_IF(texture_type == TextureType::TextureCube && is_array && is_shadow);
+    ASSERT_MSG(texture_type != TextureType::Texture3D || is_array || is_shadow,
+               "Illegal texture type");
 
     const SamplerInfo info{texture_type, is_array, is_shadow, false};
-    Node index_var{};
+    Node index_var;
     const Sampler* sampler = is_bindless ? GetBindlessSampler(*bindless_reg, index_var, info)
                                          : GetSampler(instr.sampler, info);
-    Node4 values;
-    if (sampler == nullptr) {
-        for (u32 element = 0; element < values.size(); ++element) {
-            values[element] = Immediate(0);
-        }
-        return values;
+    if (!sampler) {
+        return {Immediate(0), Immediate(0), Immediate(0), Immediate(0)};
     }
 
     const bool lod_needed = process_mode == TextureProcessMode::LZ ||
                             process_mode == TextureProcessMode::LL ||
                             process_mode == TextureProcessMode::LLA;
-
-    // LOD selection (either via bias or explicit textureLod) not supported in GL for
-    // sampler2DArrayShadow and samplerCubeArrayShadow.
-    const bool gl_lod_supported =
-        !((texture_type == Tegra::Shader::TextureType::Texture2D && is_array && is_shadow) ||
-          (texture_type == Tegra::Shader::TextureType::TextureCube && is_array && is_shadow));
-
-    const OperationCode read_method =
-        (lod_needed && gl_lod_supported) ? OperationCode::TextureLod : OperationCode::Texture;
-
-    UNIMPLEMENTED_IF(process_mode != TextureProcessMode::None && !gl_lod_supported);
+    const OperationCode opcode = lod_needed ? OperationCode::TextureLod : OperationCode::Texture;
 
     Node bias;
     Node lod;
-    if (process_mode != TextureProcessMode::None && gl_lod_supported) {
-        switch (process_mode) {
-        case TextureProcessMode::LZ:
-            lod = Immediate(0.0f);
-            break;
-        case TextureProcessMode::LB:
-            // If present, lod or bias are always stored in the register
-            // indexed by the gpr20 field with an offset depending on the
-            // usage of the other registers
-            bias = GetRegister(instr.gpr20.Value() + bias_offset);
-            break;
-        case TextureProcessMode::LL:
-            lod = GetRegister(instr.gpr20.Value() + bias_offset);
-            break;
-        default:
-            UNIMPLEMENTED_MSG("Unimplemented process mode={}", static_cast<u32>(process_mode));
-            break;
-        }
+    switch (process_mode) {
+    case TextureProcessMode::None:
+        break;
+    case TextureProcessMode::LZ:
+        lod = Immediate(0.0f);
+        break;
+    case TextureProcessMode::LB:
+        // If present, lod or bias are always stored in the register indexed by the gpr20 field with
+        // an offset depending on the usage of the other registers.
+        bias = GetRegister(instr.gpr20.Value() + bias_offset);
+        break;
+    case TextureProcessMode::LL:
+        lod = GetRegister(instr.gpr20.Value() + bias_offset);
+        break;
+    default:
+        UNIMPLEMENTED_MSG("Unimplemented process mode={}", static_cast<u32>(process_mode));
+        break;
     }
 
+    Node4 values;
     for (u32 element = 0; element < values.size(); ++element) {
-        auto copy_coords = coords;
         MetaTexture meta{*sampler, array, depth_compare, aoffi,    {}, {}, bias,
                          lod,      {},    element,       index_var};
-        values[element] = Operation(read_method, meta, std::move(copy_coords));
+        values[element] = Operation(opcode, meta, coords);
     }
 
     return values;
diff --git a/src/video_core/texture_cache/texture_cache.h b/src/video_core/texture_cache/texture_cache.h
index f4c015635..0d105d386 100644
--- a/src/video_core/texture_cache/texture_cache.h
+++ b/src/video_core/texture_cache/texture_cache.h
@@ -721,7 +721,6 @@ private:
     std::pair<TSurface, TView> GetSurface(const GPUVAddr gpu_addr, const CacheAddr cache_addr,
                                           const SurfaceParams& params, bool preserve_contents,
                                           bool is_render) {
-
         // Step 1
         // Check Level 1 Cache for a fast structural match. If candidate surface
         // matches at certain level we are pretty much done.
@@ -733,14 +732,18 @@ private:
                 return RecycleSurface(overlaps, params, gpu_addr, preserve_contents,
                                       topological_result);
             }
+
             const auto struct_result = current_surface->MatchesStructure(params);
-            if (struct_result != MatchStructureResult::None &&
-                (params.target != SurfaceTarget::Texture3D ||
-                 current_surface->MatchTarget(params.target))) {
-                if (struct_result == MatchStructureResult::FullMatch) {
-                    return ManageStructuralMatch(current_surface, params, is_render);
-                } else {
-                    return RebuildSurface(current_surface, params, is_render);
+            if (struct_result != MatchStructureResult::None) {
+                const auto& old_params = current_surface->GetSurfaceParams();
+                const bool not_3d = params.target != SurfaceTarget::Texture3D &&
+                                    old_params.target != SurfaceTarget::Texture3D;
+                if (not_3d || current_surface->MatchTarget(params.target)) {
+                    if (struct_result == MatchStructureResult::FullMatch) {
+                        return ManageStructuralMatch(current_surface, params, is_render);
+                    } else {
+                        return RebuildSurface(current_surface, params, is_render);
+                    }
                 }
             }
         }
diff --git a/src/web_service/web_backend.cpp b/src/web_service/web_backend.cpp
index 6683f459f..737ffe409 100644
--- a/src/web_service/web_backend.cpp
+++ b/src/web_service/web_backend.cpp
@@ -73,14 +73,12 @@ struct Client::Impl {
                 if (!parsedUrl.GetPort(&port)) {
                     port = HTTP_PORT;
                 }
-                cli = std::make_unique<httplib::Client>(parsedUrl.m_Host.c_str(), port,
-                                                        TIMEOUT_SECONDS);
+                cli = std::make_unique<httplib::Client>(parsedUrl.m_Host.c_str(), port);
             } else if (parsedUrl.m_Scheme == "https") {
                 if (!parsedUrl.GetPort(&port)) {
                     port = HTTPS_PORT;
                 }
-                cli = std::make_unique<httplib::SSLClient>(parsedUrl.m_Host.c_str(), port,
-                                                           TIMEOUT_SECONDS);
+                cli = std::make_unique<httplib::SSLClient>(parsedUrl.m_Host.c_str(), port);
             } else {
                 LOG_ERROR(WebService, "Bad URL scheme {}", parsedUrl.m_Scheme);
                 return Common::WebResult{Common::WebResult::Code::InvalidURL, "Bad URL scheme"};
@@ -90,6 +88,7 @@ struct Client::Impl {
             LOG_ERROR(WebService, "Invalid URL {}", host + path);
             return Common::WebResult{Common::WebResult::Code::InvalidURL, "Invalid URL"};
         }
+        cli->set_timeout_sec(TIMEOUT_SECONDS);
 
         httplib::Headers params;
         if (!jwt.empty()) {