Add SSO

closes #94

1 files changed, 5125 insertions, 0 deletions

diff --git a/third_party/cpp-httplib-0.5.12/httplib.h b/third_party/cpp-httplib-0.5.12/httplib.h
new file mode 100644
index 00000000..7816df8b
--- /dev/null
+++ b/third_party/cpp-httplib-0.5.12/httplib.h
@@ -0,0 +1,5125 @@
+//
+//  httplib.h
+//
+//  Copyright (c) 2020 Yuji Hirose. All rights reserved.
+//  MIT License
+//
+
+#ifndef CPPHTTPLIB_HTTPLIB_H
+#define CPPHTTPLIB_HTTPLIB_H
+
+/*
+ * Configuration
+ */
+
+#ifndef CPPHTTPLIB_KEEPALIVE_TIMEOUT_SECOND
+#define CPPHTTPLIB_KEEPALIVE_TIMEOUT_SECOND 5
+#endif
+
+#ifndef CPPHTTPLIB_KEEPALIVE_TIMEOUT_USECOND
+#define CPPHTTPLIB_KEEPALIVE_TIMEOUT_USECOND 0
+#endif
+
+#ifndef CPPHTTPLIB_KEEPALIVE_MAX_COUNT
+#define CPPHTTPLIB_KEEPALIVE_MAX_COUNT 5
+#endif
+
+#ifndef CPPHTTPLIB_READ_TIMEOUT_SECOND
+#define CPPHTTPLIB_READ_TIMEOUT_SECOND 5
+#endif
+
+#ifndef CPPHTTPLIB_READ_TIMEOUT_USECOND
+#define CPPHTTPLIB_READ_TIMEOUT_USECOND 0
+#endif
+
+#ifndef CPPHTTPLIB_REQUEST_URI_MAX_LENGTH
+#define CPPHTTPLIB_REQUEST_URI_MAX_LENGTH 8192
+#endif
+
+#ifndef CPPHTTPLIB_REDIRECT_MAX_COUNT
+#define CPPHTTPLIB_REDIRECT_MAX_COUNT 20
+#endif
+
+#ifndef CPPHTTPLIB_PAYLOAD_MAX_LENGTH
+#define CPPHTTPLIB_PAYLOAD_MAX_LENGTH ((std::numeric_limits<size_t>::max)())
+#endif
+
+#ifndef CPPHTTPLIB_RECV_BUFSIZ
+#define CPPHTTPLIB_RECV_BUFSIZ size_t(4096u)
+#endif
+
+#ifndef CPPHTTPLIB_THREAD_POOL_COUNT
+#define CPPHTTPLIB_THREAD_POOL_COUNT                                           \
+  ((std::max)(8u, std::thread::hardware_concurrency() - 1))
+#endif
+
+/*
+ * Headers
+ */
+
+#ifdef _WIN32
+#ifndef _CRT_SECURE_NO_WARNINGS
+#define _CRT_SECURE_NO_WARNINGS
+#endif //_CRT_SECURE_NO_WARNINGS
+
+#ifndef _CRT_NONSTDC_NO_DEPRECATE
+#define _CRT_NONSTDC_NO_DEPRECATE
+#endif //_CRT_NONSTDC_NO_DEPRECATE
+
+#if defined(_MSC_VER)
+#ifdef _WIN64
+using ssize_t = __int64;
+#else
+using ssize_t = int;
+#endif
+
+#if _MSC_VER < 1900
+#define snprintf _snprintf_s
+#endif
+#endif // _MSC_VER
+
+#ifndef S_ISREG
+#define S_ISREG(m) (((m)&S_IFREG) == S_IFREG)
+#endif // S_ISREG
+
+#ifndef S_ISDIR
+#define S_ISDIR(m) (((m)&S_IFDIR) == S_IFDIR)
+#endif // S_ISDIR
+
+#ifndef NOMINMAX
+#define NOMINMAX
+#endif // NOMINMAX
+
+#include <io.h>
+#include <winsock2.h>
+#include <ws2tcpip.h>
+
+#ifndef WSA_FLAG_NO_HANDLE_INHERIT
+#define WSA_FLAG_NO_HANDLE_INHERIT 0x80
+#endif
+
+#ifdef _MSC_VER
+#pragma comment(lib, "ws2_32.lib")
+#endif
+
+#ifndef strcasecmp
+#define strcasecmp _stricmp
+#endif // strcasecmp
+
+using socket_t = SOCKET;
+#ifdef CPPHTTPLIB_USE_POLL
+#define poll(fds, nfds, timeout) WSAPoll(fds, nfds, timeout)
+#endif
+
+#else // not _WIN32
+
+#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 <sys/select.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+using socket_t = int;
+#define INVALID_SOCKET (-1)
+#endif //_WIN32
+
+#include <array>
+#include <atomic>
+#include <cassert>
+#include <climits>
+#include <condition_variable>
+#include <errno.h>
+#include <fcntl.h>
+#include <fstream>
+#include <functional>
+#include <list>
+#include <map>
+#include <memory>
+#include <mutex>
+#include <random>
+#include <regex>
+#include <string>
+#include <sys/stat.h>
+#include <thread>
+
+#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
+#include <openssl/err.h>
+#include <openssl/md5.h>
+#include <openssl/ssl.h>
+#include <openssl/x509v3.h>
+
+#include <iomanip>
+#include <iostream>
+#include <sstream>
+
+// #if OPENSSL_VERSION_NUMBER < 0x1010100fL
+// #error Sorry, OpenSSL versions prior to 1.1.1 are not supported
+// #endif
+
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#include <openssl/crypto.h>
+inline const unsigned char *ASN1_STRING_get0_data(const ASN1_STRING *asn1) {
+  return M_ASN1_STRING_data(asn1);
+}
+#endif
+#endif
+
+#ifdef CPPHTTPLIB_ZLIB_SUPPORT
+#include <zlib.h>
+#endif
+/*
+ * Declaration
+ */
+namespace httplib {
+
+namespace detail {
+
+struct ci {
+  bool operator()(const std::string &s1, const std::string &s2) const {
+    return std::lexicographical_compare(
+        s1.begin(), s1.end(), s2.begin(), s2.end(),
+        [](char c1, char c2) { return ::tolower(c1) < ::tolower(c2); });
+  }
+};
+
+} // namespace detail
+
+using Headers = std::multimap<std::string, std::string, detail::ci>;
+
+using Params = std::multimap<std::string, std::string>;
+using Match = std::smatch;
+
+using Progress = std::function<bool(uint64_t current, uint64_t total)>;
+
+struct Response;
+using ResponseHandler = std::function<bool(const Response &response)>;
+
+struct MultipartFormData {
+  std::string name;
+  std::string content;
+  std::string filename;
+  std::string content_type;
+};
+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_;
+};
+
+using Range = std::pair<ssize_t, ssize_t>;
+using Ranges = std::vector<Range>;
+
+struct Request {
+  std::string method;
+  std::string path;
+  Headers headers;
+  std::string body;
+
+  std::string remote_addr;
+  int remote_port = -1;
+
+  // for server
+  std::string version;
+  std::string target;
+  Params params;
+  MultipartFormDataMap files;
+  Ranges ranges;
+  Match matches;
+
+  // for client
+  size_t redirect_count = CPPHTTPLIB_REDIRECT_MAX_COUNT;
+  ResponseHandler response_handler;
+  ContentReceiver content_receiver;
+  Progress progress;
+
+#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
+  const SSL *ssl;
+#endif
+
+  bool has_header(const char *key) const;
+  std::string get_header_value(const char *key, size_t id = 0) const;
+  size_t get_header_value_count(const char *key) const;
+  void set_header(const char *key, const char *val);
+  void set_header(const char *key, const std::string &val);
+
+  bool has_param(const char *key) const;
+  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;
+  MultipartFormData get_file_value(const char *key) const;
+
+  // private members...
+  size_t content_length;
+  ContentProvider content_provider;
+};
+
+struct Response {
+  std::string version;
+  int status = -1;
+  Headers headers;
+  std::string body;
+
+  bool has_header(const char *key) const;
+  std::string get_header_value(const char *key, size_t id = 0) const;
+  size_t get_header_value_count(const char *key) const;
+  void set_header(const char *key, const char *val);
+  void set_header(const char *key, const std::string &val);
+
+  void set_redirect(const char *url, int status = 302);
+  void set_content(const char *s, size_t n, const char *content_type);
+  void set_content(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()> resource_releaser = [] {});
+
+  void set_chunked_content_provider(
+      std::function<void(size_t offset, DataSink &sink)> provider,
+      std::function<void()> resource_releaser = [] {});
+
+  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();
+    }
+  }
+
+  // private members...
+  size_t content_length = 0;
+  ContentProvider content_provider;
+  std::function<void()> content_provider_resource_releaser;
+};
+
+class Stream {
+public:
+  virtual ~Stream() = default;
+
+  virtual bool is_readable() const = 0;
+  virtual bool is_writable() const = 0;
+
+  virtual ssize_t read(char *ptr, size_t size) = 0;
+  virtual ssize_t write(const char *ptr, size_t size) = 0;
+  virtual void get_remote_ip_and_port(std::string &ip, int &port) const = 0;
+
+  template <typename... Args>
+  ssize_t write_format(const char *fmt, const Args &... args);
+  ssize_t write(const char *ptr);
+  ssize_t write(const std::string &s);
+};
+
+class TaskQueue {
+public:
+  TaskQueue() = default;
+  virtual ~TaskQueue() = default;
+
+  virtual void enqueue(std::function<void()> fn) = 0;
+  virtual void shutdown() = 0;
+
+  virtual void on_idle(){};
+};
+
+class ThreadPool : public TaskQueue {
+public:
+  explicit ThreadPool(size_t n) : shutdown_(false) {
+    while (n) {
+      threads_.emplace_back(worker(*this));
+      n--;
+    }
+  }
+
+  ThreadPool(const ThreadPool &) = delete;
+  ~ThreadPool() override = default;
+
+  void enqueue(std::function<void()> fn) override {
+    std::unique_lock<std::mutex> lock(mutex_);
+    jobs_.push_back(fn);
+    cond_.notify_one();
+  }
+
+  void shutdown() override {
+    // Stop all worker threads...
+    {
+      std::unique_lock<std::mutex> lock(mutex_);
+      shutdown_ = true;
+    }
+
+    cond_.notify_all();
+
+    // Join...
+    for (auto &t : threads_) {
+      t.join();
+    }
+  }
+
+private:
+  struct worker {
+    explicit worker(ThreadPool &pool) : pool_(pool) {}
+
+    void operator()() {
+      for (;;) {
+        std::function<void()> fn;
+        {
+          std::unique_lock<std::mutex> lock(pool_.mutex_);
+
+          pool_.cond_.wait(
+              lock, [&] { return !pool_.jobs_.empty() || pool_.shutdown_; });
+
+          if (pool_.shutdown_ && pool_.jobs_.empty()) { break; }
+
+          fn = pool_.jobs_.front();
+          pool_.jobs_.pop_front();
+        }
+
+        assert(true == static_cast<bool>(fn));
+        fn();
+      }
+    }
+
+    ThreadPool &pool_;
+  };
+  friend struct worker;
+
+  std::vector<std::thread> threads_;
+  std::list<std::function<void()>> jobs_;
+
+  bool shutdown_;
+
+  std::condition_variable cond_;
+  std::mutex mutex_;
+};
+
+using Logger = std::function<void(const Request &, const Response &)>;
+
+class Server {
+public:
+  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();
+
+  virtual ~Server();
+
+  virtual bool is_valid() const;
+
+  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 &Delete(const char *pattern, HandlerWithContentReader handler);
+  Server &Options(const char *pattern, Handler handler);
+
+  [[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();
+
+  bool listen(const char *host, int port, int socket_flags = 0);
+
+  bool is_running() const;
+  void stop();
+
+  std::function<TaskQueue *(void)> new_task_queue;
+
+protected:
+  bool process_request(Stream &strm, bool last_connection,
+                       bool &connection_close,
+                       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:
+  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, Stream &strm);
+  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,
+                      Response &res);
+  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, Request &req, Response &res);
+  bool
+  read_content_with_content_receiver(Stream &strm, Request &req, Response &res,
+                                     ContentReceiver receiver,
+                                     MultipartContentHeader multipart_header,
+                                     ContentReceiver multipart_receiver);
+  bool read_content_core(Stream &strm, 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::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_;
+  HandlersForContentReader delete_handlers_for_content_reader_;
+  Handlers options_handlers_;
+  Handler error_handler_;
+  Logger logger_;
+  Expect100ContinueHandler expect_100_continue_handler_;
+};
+
+class Client {
+public:
+  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();
+
+  virtual bool is_valid() const;
+
+  std::shared_ptr<Response> Get(const char *path);
+
+  std::shared_ptr<Response> Get(const char *path, const Headers &headers);
+
+  std::shared_ptr<Response> Get(const char *path, Progress progress);
+
+  std::shared_ptr<Response> Get(const char *path, const Headers &headers,
+                                Progress progress);
+
+  std::shared_ptr<Response> Get(const char *path,
+                                ContentReceiver content_receiver);
+
+  std::shared_ptr<Response> Get(const char *path, const Headers &headers,
+                                ContentReceiver content_receiver);
+
+  std::shared_ptr<Response>
+  Get(const char *path, ContentReceiver content_receiver, Progress progress);
+
+  std::shared_ptr<Response> Get(const char *path, const Headers &headers,
+                                ContentReceiver content_receiver,
+                                Progress progress);
+
+  std::shared_ptr<Response> Get(const char *path, const Headers &headers,
+                                ResponseHandler response_handler,
+                                ContentReceiver content_receiver);
+
+  std::shared_ptr<Response> Get(const char *path, const Headers &headers,
+                                ResponseHandler response_handler,
+                                ContentReceiver content_receiver,
+                                Progress progress);
+
+  std::shared_ptr<Response> Head(const char *path);
+
+  std::shared_ptr<Response> Head(const char *path, const Headers &headers);
+
+  std::shared_ptr<Response> Post(const char *path);
+
+  std::shared_ptr<Response> Post(const char *path, const std::string &body,
+                                 const char *content_type);
+
+  std::shared_ptr<Response> Post(const char *path, const Headers &headers,
+                                 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,
+                                 const Params &params);
+
+  std::shared_ptr<Response> Post(const char *path,
+                                 const MultipartFormDataItems &items);
+
+  std::shared_ptr<Response> Post(const char *path, const Headers &headers,
+                                 const MultipartFormDataItems &items);
+
+  std::shared_ptr<Response> Put(const char *path);
+
+  std::shared_ptr<Response> Put(const char *path, const std::string &body,
+                                const char *content_type);
+
+  std::shared_ptr<Response> Put(const char *path, const Headers &headers,
+                                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);
+
+  std::shared_ptr<Response> Patch(const char *path, const Headers &headers,
+                                  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,
+                                   const char *content_type);
+
+  std::shared_ptr<Response> Delete(const char *path, const Headers &headers);
+
+  std::shared_ptr<Response> Delete(const char *path, const Headers &headers,
+                                   const std::string &body,
+                                   const char *content_type);
+
+  std::shared_ptr<Response> Options(const char *path);
+
+  std::shared_ptr<Response> Options(const char *path, const Headers &headers);
+
+  bool send(const Request &req, Response &res);
+
+  bool send(const std::vector<Request> &requests,
+            std::vector<Response> &responses);
+
+  void stop();
+
+  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 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,
+                       bool last_connection, bool &connection_close);
+
+  std::atomic<socket_t> sock_;
+
+  const std::string host_;
+  const int port_;
+  const std::string host_and_port_;
+
+  // 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);
+  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,
+      std::function<bool(Stream &strm, bool last_connection,
+                         bool &connection_close)>
+          callback);
+
+  virtual bool is_ssl() const;
+};
+
+inline void Get(std::vector<Request> &requests, const char *path,
+                const Headers &headers) {
+  Request req;
+  req.method = "GET";
+  req.path = path;
+  req.headers = headers;
+  requests.emplace_back(std::move(req));
+}
+
+inline void Get(std::vector<Request> &requests, const char *path) {
+  Get(requests, path, Headers());
+}
+
+inline void Post(std::vector<Request> &requests, const char *path,
+                 const Headers &headers, const std::string &body,
+                 const char *content_type) {
+  Request req;
+  req.method = "POST";
+  req.path = path;
+  req.headers = headers;
+  if (content_type) { req.headers.emplace("Content-Type", content_type); }
+  req.body = body;
+  requests.emplace_back(std::move(req));
+}
+
+inline void Post(std::vector<Request> &requests, const char *path,
+                 const std::string &body, const char *content_type) {
+  Post(requests, path, Headers(), body, content_type);
+}
+
+#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
+class SSLServer : public Server {
+public:
+  SSLServer(const char *cert_path, const char *private_key_path,
+            const char *client_ca_cert_file_path = nullptr,
+            const char *client_ca_cert_dir_path = nullptr);
+
+  SSLServer(X509 *cert, EVP_PKEY *private_key,
+            X509_STORE *client_ca_cert_store = nullptr);
+
+  ~SSLServer() override;
+
+  bool is_valid() const override;
+
+private:
+  bool process_and_close_socket(socket_t sock) override;
+
+  SSL_CTX *ctx_;
+  std::mutex ctx_mutex_;
+};
+
+class SSLClient : public Client {
+public:
+  explicit SSLClient(const std::string &host, int port = 443,
+                     const std::string &client_cert_path = std::string(),
+                     const std::string &client_key_path = std::string());
+
+  SSLClient(const std::string &host, int port, X509 *client_cert,
+            EVP_PKEY *client_key);
+
+  ~SSLClient() override;
+
+  bool is_valid() const override;
+
+  void set_ca_cert_path(const char *ca_ceert_file_path,
+                        const char *ca_cert_dir_path = nullptr);
+
+  void set_ca_cert_store(X509_STORE *ca_cert_store);
+
+  void enable_server_certificate_verification(bool enabled);
+
+  long get_openssl_verify_result() const;
+
+  SSL_CTX *ssl_context() const;
+
+private:
+  bool process_and_close_socket(
+      socket_t sock, size_t request_count,
+      std::function<bool(Stream &strm, bool last_connection,
+                         bool &connection_close)>
+          callback) override;
+  bool is_ssl() const override;
+
+  bool verify_host(X509 *server_cert) const;
+  bool verify_host_with_subject_alt_name(X509 *server_cert) const;
+  bool verify_host_with_common_name(X509 *server_cert) const;
+  bool check_host_name(const char *pattern, size_t pattern_len) const;
+
+  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_;
+  X509_STORE *ca_cert_store_ = nullptr;
+  bool server_certificate_verification_ = false;
+  long verify_result_ = 0;
+};
+#endif
+
+// ----------------------------------------------------------------------------
+
+/*
+ * Implementation
+ */
+
+namespace detail {
+
+inline bool is_hex(char c, int &v) {
+  if (0x20 <= c && isdigit(c)) {
+    v = c - '0';
+    return true;
+  } else if ('A' <= c && c <= 'F') {
+    v = c - 'A' + 10;
+    return true;
+  } else if ('a' <= c && c <= 'f') {
+    v = c - 'a' + 10;
+    return true;
+  }
+  return false;
+}
+
+inline bool from_hex_to_i(const std::string &s, size_t i, size_t cnt,
+                          int &val) {
+  if (i >= s.size()) { return false; }
+
+  val = 0;
+  for (; cnt; i++, cnt--) {
+    if (!s[i]) { return false; }
+    int v = 0;
+    if (is_hex(s[i], v)) {
+      val = val * 16 + v;
+    } else {
+      return false;
+    }
+  }
+  return true;
+}
+
+inline std::string from_i_to_hex(size_t n) {
+  const char *charset = "0123456789abcdef";
+  std::string ret;
+  do {
+    ret = charset[n & 15] + ret;
+    n >>= 4;
+  } while (n > 0);
+  return ret;
+}
+
+inline size_t to_utf8(int code, char *buff) {
+  if (code < 0x0080) {
+    buff[0] = (code & 0x7F);
+    return 1;
+  } else if (code < 0x0800) {
+    buff[0] = static_cast<char>(0xC0 | ((code >> 6) & 0x1F));
+    buff[1] = static_cast<char>(0x80 | (code & 0x3F));
+    return 2;
+  } else if (code < 0xD800) {
+    buff[0] = static_cast<char>(0xE0 | ((code >> 12) & 0xF));
+    buff[1] = static_cast<char>(0x80 | ((code >> 6) & 0x3F));
+    buff[2] = static_cast<char>(0x80 | (code & 0x3F));
+    return 3;
+  } else if (code < 0xE000) { // D800 - DFFF is invalid...
+    return 0;
+  } else if (code < 0x10000) {
+    buff[0] = static_cast<char>(0xE0 | ((code >> 12) & 0xF));
+    buff[1] = static_cast<char>(0x80 | ((code >> 6) & 0x3F));
+    buff[2] = static_cast<char>(0x80 | (code & 0x3F));
+    return 3;
+  } else if (code < 0x110000) {
+    buff[0] = static_cast<char>(0xF0 | ((code >> 18) & 0x7));
+    buff[1] = static_cast<char>(0x80 | ((code >> 12) & 0x3F));
+    buff[2] = static_cast<char>(0x80 | ((code >> 6) & 0x3F));
+    buff[3] = static_cast<char>(0x80 | (code & 0x3F));
+    return 4;
+  }
+
+  // NOTREACHED
+  return 0;
+}
+
+// NOTE: This code came up with the following stackoverflow post:
+// https://stackoverflow.com/questions/180947/base64-decode-snippet-in-c
+inline std::string base64_encode(const std::string &in) {
+  static const auto lookup =
+      "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+  std::string out;
+  out.reserve(in.size());
+
+  int val = 0;
+  int valb = -6;
+
+  for (auto c : in) {
+    val = (val << 8) + static_cast<uint8_t>(c);
+    valb += 8;
+    while (valb >= 0) {
+      out.push_back(lookup[(val >> valb) & 0x3F]);
+      valb -= 6;
+    }
+  }
+
+  if (valb > -6) { out.push_back(lookup[((val << 8) >> (valb + 8)) & 0x3F]); }
+
+  while (out.size() % 4) {
+    out.push_back('=');
+  }
+
+  return out;
+}
+
+inline bool is_file(const std::string &path) {
+  struct stat st;
+  return stat(path.c_str(), &st) >= 0 && S_ISREG(st.st_mode);
+}
+
+inline bool is_dir(const std::string &path) {
+  struct stat st;
+  return stat(path.c_str(), &st) >= 0 && S_ISDIR(st.st_mode);
+}
+
+inline bool is_valid_path(const std::string &path) {
+  size_t level = 0;
+  size_t i = 0;
+
+  // Skip slash
+  while (i < path.size() && path[i] == '/') {
+    i++;
+  }
+
+  while (i < path.size()) {
+    // Read component
+    auto beg = i;
+    while (i < path.size() && path[i] != '/') {
+      i++;
+    }
+
+    auto len = i - beg;
+    assert(len > 0);
+
+    if (!path.compare(beg, len, ".")) {
+      ;
+    } else if (!path.compare(beg, len, "..")) {
+      if (level == 0) { return false; }
+      level--;
+    } else {
+      level++;
+    }
+
+    // Skip slash
+    while (i < path.size() && path[i] == '/') {
+      i++;
+    }
+  }
+
+  return true;
+}
+
+inline void read_file(const std::string &path, std::string &out) {
+  std::ifstream fs(path, std::ios_base::binary);
+  fs.seekg(0, std::ios_base::end);
+  auto size = fs.tellg();
+  fs.seekg(0);
+  out.resize(static_cast<size_t>(size));
+  fs.read(&out[0], size);
+}
+
+inline std::string file_extension(const std::string &path) {
+  std::smatch m;
+  static auto re = std::regex("\\.([a-zA-Z0-9]+)$");
+  if (std::regex_search(path, m, re)) { return m[1].str(); }
+  return std::string();
+}
+
+template <class Fn> void split(const char *b, const char *e, char d, Fn fn) {
+  int i = 0;
+  int beg = 0;
+
+  while (e ? (b + i != e) : (b[i] != '\0')) {
+    if (b[i] == d) {
+      fn(&b[beg], &b[i]);
+      beg = i + 1;
+    }
+    i++;
+  }
+
+  if (i) { fn(&b[beg], &b[i]); }
+}
+
+// NOTE: until the read size reaches `fixed_buffer_size`, use `fixed_buffer`
+// to store data. The call can set memory on stack for performance.
+class stream_line_reader {
+public:
+  stream_line_reader(Stream &strm, char *fixed_buffer, size_t fixed_buffer_size)
+      : strm_(strm), fixed_buffer_(fixed_buffer),
+        fixed_buffer_size_(fixed_buffer_size) {}
+
+  const char *ptr() const {
+    if (glowable_buffer_.empty()) {
+      return fixed_buffer_;
+    } else {
+      return glowable_buffer_.data();
+    }
+  }
+
+  size_t size() const {
+    if (glowable_buffer_.empty()) {
+      return fixed_buffer_used_size_;
+    } else {
+      return glowable_buffer_.size();
+    }
+  }
+
+  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();
+
+    for (size_t i = 0;; i++) {
+      char byte;
+      auto n = strm_.read(&byte, 1);
+
+      if (n < 0) {
+        return false;
+      } else if (n == 0) {
+        if (i == 0) {
+          return false;
+        } else {
+          break;
+        }
+      }
+
+      append(byte);
+
+      if (byte == '\n') { break; }
+    }
+
+    return true;
+  }
+
+private:
+  void append(char c) {
+    if (fixed_buffer_used_size_ < fixed_buffer_size_ - 1) {
+      fixed_buffer_[fixed_buffer_used_size_++] = c;
+      fixed_buffer_[fixed_buffer_used_size_] = '\0';
+    } else {
+      if (glowable_buffer_.empty()) {
+        assert(fixed_buffer_[fixed_buffer_used_size_] == '\0');
+        glowable_buffer_.assign(fixed_buffer_, fixed_buffer_used_size_);
+      }
+      glowable_buffer_ += c;
+    }
+  }
+
+  Stream &strm_;
+  char *fixed_buffer_;
+  const size_t fixed_buffer_size_;
+  size_t fixed_buffer_used_size_ = 0;
+  std::string glowable_buffer_;
+};
+
+inline int close_socket(socket_t sock) {
+#ifdef _WIN32
+  return closesocket(sock);
+#else
+  return close(sock);
+#endif
+}
+
+template <typename T>
+inline ssize_t handle_EINTR(T fn) {
+  ssize_t res = false;
+  while (true) {
+    res = fn();
+    if (res < 0 && errno == EINTR) {
+      continue;
+    }
+    break;
+  }
+  return res;
+}
+
+#define HANDLE_EINTR(method, ...) (handle_EINTR([&]() { return method(__VA_ARGS__); }))
+
+inline ssize_t select_read(socket_t sock, time_t sec, time_t usec) {
+#ifdef CPPHTTPLIB_USE_POLL
+  struct pollfd pfd_read;
+  pfd_read.fd = sock;
+  pfd_read.events = POLLIN;
+
+  auto timeout = static_cast<int>(sec * 1000 + usec / 1000);
+
+  return HANDLE_EINTR(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<decltype(tv.tv_usec)>(usec);
+
+  return HANDLE_EINTR(select, static_cast<int>(sock + 1), &fds, nullptr, nullptr, &tv);
+#endif
+}
+
+inline ssize_t 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 HANDLE_EINTR(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<decltype(tv.tv_usec)>(usec);
+
+  return HANDLE_EINTR(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;
+  pfd_read.fd = sock;
+  pfd_read.events = POLLIN | POLLOUT;
+
+  auto timeout = static_cast<int>(sec * 1000 + usec / 1000);
+
+  auto poll_res = HANDLE_EINTR(poll, &pfd_read, 1, timeout);
+  if (poll_res > 0 && pfd_read.revents & (POLLIN | POLLOUT)) {
+    int error = 0;
+    socklen_t len = sizeof(error);
+    auto res = getsockopt(sock, SOL_SOCKET, SO_ERROR,
+                      reinterpret_cast<char *>(&error), &len);
+    return res >= 0 && !error;
+  }
+  return false;
+#else
+  fd_set fdsr;
+  FD_ZERO(&fdsr);
+  FD_SET(sock, &fdsr);
+
+  auto fdsw = fdsr;
+  auto fdse = fdsr;
+
+  timeval tv;
+  tv.tv_sec = static_cast<long>(sec);
+  tv.tv_usec = static_cast<decltype(tv.tv_usec)>(usec);
+
+  if (HANDLE_EINTR(select, static_cast<int>(sock + 1), &fdsr, &fdsw, &fdse, &tv) > 0 &&
+      (FD_ISSET(sock, &fdsr) || FD_ISSET(sock, &fdsw))) {
+    int error = 0;
+    socklen_t len = sizeof(error);
+    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;
+  ssize_t read(char *ptr, size_t size) override;
+  ssize_t write(const char *ptr, size_t size) override;
+  void get_remote_ip_and_port(std::string &ip, int &port) 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);
+  ~SSLSocketStream() override;
+
+  bool is_readable() const override;
+  bool is_writable() const override;
+  ssize_t read(char *ptr, size_t size) override;
+  ssize_t write(const char *ptr, size_t size) override;
+  void get_remote_ip_and_port(std::string &ip, int &port) 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;
+  ssize_t read(char *ptr, size_t size) override;
+  ssize_t write(const char *ptr, size_t size) override;
+  void get_remote_ip_and_port(std::string &ip, int &port) const override;
+
+  const std::string &get_buffer() const;
+
+private:
+  std::string buffer;
+  size_t position = 0;
+};
+
+template <typename T>
+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);
+
+  auto ret = false;
+
+  if (keep_alive_max_count > 1) {
+    auto count = keep_alive_max_count;
+    while (count > 0 &&
+           (is_client_request ||
+            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;
+
+      ret = callback(strm, last_connection, connection_close);
+      if (!ret || connection_close) { break; }
+
+      count--;
+    }
+  } 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;
+}
+
+inline int shutdown_socket(socket_t sock) {
+#ifdef _WIN32
+  return shutdown(sock, SD_BOTH);
+#else
+  return shutdown(sock, SHUT_RDWR);
+#endif
+}
+
+template <typename Fn>
+socket_t create_socket(const char *host, int port, Fn fn,
+                       int socket_flags = 0) {
+#ifdef _WIN32
+#define SO_SYNCHRONOUS_NONALERT 0x20
+#define SO_OPENTYPE 0x7008
+
+  int opt = SO_SYNCHRONOUS_NONALERT;
+  setsockopt(INVALID_SOCKET, SOL_SOCKET, SO_OPENTYPE, (char *)&opt,
+             sizeof(opt));
+#endif
+
+  // Get address info
+  struct addrinfo hints;
+  struct addrinfo *result;
+
+  memset(&hints, 0, sizeof(struct addrinfo));
+  hints.ai_family = AF_UNSPEC;
+  hints.ai_socktype = SOCK_STREAM;
+  hints.ai_flags = socket_flags;
+  hints.ai_protocol = 0;
+
+  auto service = std::to_string(port);
+
+  if (getaddrinfo(host, service.c_str(), &hints, &result)) {
+    return INVALID_SOCKET;
+  }
+
+  for (auto rp = result; rp; rp = rp->ai_next) {
+    // Create a socket
+#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
+    if (sock == INVALID_SOCKET) { continue; }
+
+#ifndef _WIN32
+    if (fcntl(sock, F_SETFD, FD_CLOEXEC) == -1) { continue; }
+#endif
+
+    // Make 'reuse address' option available
+    int yes = 1;
+    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));
+#endif
+
+    // bind or connect
+    if (fn(sock, *rp)) {
+      freeaddrinfo(result);
+      return sock;
+    }
+
+    close_socket(sock);
+  }
+
+  freeaddrinfo(result);
+  return INVALID_SOCKET;
+}
+
+inline void set_nonblocking(socket_t sock, bool nonblocking) {
+#ifdef _WIN32
+  auto flags = nonblocking ? 1UL : 0UL;
+  ioctlsocket(sock, FIONBIO, &flags);
+#else
+  auto flags = fcntl(sock, F_GETFL, 0);
+  fcntl(sock, F_SETFL,
+        nonblocking ? (flags | O_NONBLOCK) : (flags & (~O_NONBLOCK)));
+#endif
+}
+
+inline bool is_connection_error() {
+#ifdef _WIN32
+  return WSAGetLastError() != WSAEWOULDBLOCK;
+#else
+  return errno != EINPROGRESS;
+#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<socklen_t>(ai.ai_addrlen))) {
+      ret = true;
+      break;
+    }
+  }
+
+  freeaddrinfo(result);
+  return ret;
+}
+
+#ifndef _WIN32
+inline std::string if2ip(const std::string &ifn) {
+  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);
+  return std::string();
+}
+#endif
+
+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()) {
+#ifndef _WIN32
+          auto ip = if2ip(intf);
+          if (ip.empty()) { ip = intf; }
+          if (!bind_ip_address(sock, ip.c_str())) { return false; }
+#endif
+        }
+
+        set_nonblocking(sock, true);
+
+        auto ret =
+            ::connect(sock, ai.ai_addr, static_cast<socklen_t>(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 void get_remote_ip_and_port(const struct sockaddr_storage &addr,
+                                   socklen_t addr_len, std::string &ip,
+                                   int &port) {
+  if (addr.ss_family == AF_INET) {
+    port = ntohs(reinterpret_cast<const struct sockaddr_in *>(&addr)->sin_port);
+  } else if (addr.ss_family == AF_INET6) {
+    port =
+        ntohs(reinterpret_cast<const struct sockaddr_in6 *>(&addr)->sin6_port);
+  }
+
+  std::array<char, NI_MAXHOST> ipstr{};
+  if (!getnameinfo(reinterpret_cast<const struct sockaddr *>(&addr), addr_len,
+                   ipstr.data(), static_cast<socklen_t>(ipstr.size()), nullptr,
+                   0, NI_NUMERICHOST)) {
+    ip = ipstr.data();
+  }
+}
+
+inline void get_remote_ip_and_port(socket_t sock, std::string &ip, int &port) {
+  struct sockaddr_storage addr;
+  socklen_t addr_len = sizeof(addr);
+
+  if (!getpeername(sock, reinterpret_cast<struct sockaddr *>(&addr),
+                   &addr_len)) {
+    get_remote_ip_and_port(addr, addr_len, ip, port);
+  }
+}
+
+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" || ext == "htm") {
+    return "text/html";
+  } else if (ext == "css") {
+    return "text/css";
+  } else if (ext == "jpeg" || ext == "jpg") {
+    return "image/jpg";
+  } else if (ext == "png") {
+    return "image/png";
+  } else if (ext == "gif") {
+    return "image/gif";
+  } else if (ext == "svg") {
+    return "image/svg+xml";
+  } else if (ext == "ico") {
+    return "image/x-icon";
+  } else if (ext == "json") {
+    return "application/json";
+  } else if (ext == "pdf") {
+    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") {
+    return "application/xhtml+xml";
+  }
+  return nullptr;
+}
+
+inline const char *status_message(int status) {
+  switch (status) {
+  case 100: return "Continue";
+  case 101: return "Switching Protocol";
+  case 102: return "Processing";
+  case 103: return "Early Hints";
+  case 200: return "OK";
+  case 201: return "Created";
+  case 202: return "Accepted";
+  case 203: return "Non-Authoritative Information";
+  case 204: return "No Content";
+  case 205: return "Reset Content";
+  case 206: return "Partial Content";
+  case 207: return "Multi-Status";
+  case 208: return "Already Reported";
+  case 226: return "IM Used";
+  case 300: return "Multiple Choice";
+  case 301: return "Moved Permanently";
+  case 302: return "Found";
+  case 303: return "See Other";
+  case 304: return "Not Modified";
+  case 305: return "Use Proxy";
+  case 306: return "unused";
+  case 307: return "Temporary Redirect";
+  case 308: return "Permanent Redirect";
+  case 400: return "Bad Request";
+  case 401: return "Unauthorized";
+  case 402: return "Payment Required";
+  case 403: return "Forbidden";
+  case 404: return "Not Found";
+  case 405: return "Method Not Allowed";
+  case 406: return "Not Acceptable";
+  case 407: return "Proxy Authentication Required";
+  case 408: return "Request Timeout";
+  case 409: return "Conflict";
+  case 410: return "Gone";
+  case 411: return "Length Required";
+  case 412: return "Precondition Failed";
+  case 413: return "Payload Too Large";
+  case 414: return "URI Too Long";
+  case 415: return "Unsupported Media Type";
+  case 416: return "Range Not Satisfiable";
+  case 417: return "Expectation Failed";
+  case 418: return "I'm a teapot";
+  case 421: return "Misdirected Request";
+  case 422: return "Unprocessable Entity";
+  case 423: return "Locked";
+  case 424: return "Failed Dependency";
+  case 425: return "Too Early";
+  case 426: return "Upgrade Required";
+  case 428: return "Precondition Required";
+  case 429: return "Too Many Requests";
+  case 431: return "Request Header Fields Too Large";
+  case 451: return "Unavailable For Legal Reasons";
+  case 501: return "Not Implemented";
+  case 502: return "Bad Gateway";
+  case 503: return "Service Unavailable";
+  case 504: return "Gateway Timeout";
+  case 505: return "HTTP Version Not Supported";
+  case 506: return "Variant Also Negotiates";
+  case 507: return "Insufficient Storage";
+  case 508: return "Loop Detected";
+  case 510: return "Not Extended";
+  case 511: return "Network Authentication Required";
+
+  default:
+  case 500: return "Internal Server Error";
+  }
+}
+
+#ifdef CPPHTTPLIB_ZLIB_SUPPORT
+inline bool can_compress(const std::string &content_type) {
+  return !content_type.find("text/") || content_type == "image/svg+xml" ||
+         content_type == "application/javascript" ||
+         content_type == "application/json" ||
+         content_type == "application/xml" ||
+         content_type == "application/xhtml+xml";
+}
+
+inline bool compress(std::string &content) {
+  z_stream strm;
+  strm.zalloc = Z_NULL;
+  strm.zfree = Z_NULL;
+  strm.opaque = Z_NULL;
+
+  auto ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, Z_DEFLATED, 31, 8,
+                          Z_DEFAULT_STRATEGY);
+  if (ret != Z_OK) { return false; }
+
+  strm.avail_in = static_cast<decltype(strm.avail_in)>(content.size());
+  strm.next_in =
+      const_cast<Bytef *>(reinterpret_cast<const Bytef *>(content.data()));
+
+  std::string compressed;
+
+  std::array<char, 16384> buff{};
+  do {
+    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.data(), buff.size() - strm.avail_out);
+  } while (strm.avail_out == 0);
+
+  assert(ret == Z_STREAM_END);
+  assert(strm.avail_in == 0);
+
+  content.swap(compressed);
+
+  deflateEnd(&strm);
+  return true;
+}
+
+class decompressor {
+public:
+  decompressor() {
+    std::memset(&strm, 0, sizeof(strm));
+    strm.zalloc = Z_NULL;
+    strm.zfree = Z_NULL;
+    strm.opaque = Z_NULL;
+
+    // 15 is the value of wbits, which should be at the maximum possible value
+    // to ensure that any gzip stream can be decoded. The offset of 32 specifies
+    // that the stream type should be automatically detected either gzip or
+    // deflate.
+    is_valid_ = inflateInit2(&strm, 32 + 15) == Z_OK;
+  }
+
+  ~decompressor() { inflateEnd(&strm); }
+
+  bool is_valid() const { return is_valid_; }
+
+  template <typename T>
+  bool decompress(const char *data, size_t data_length, T callback) {
+    int ret = Z_OK;
+
+    strm.avail_in = static_cast<decltype(strm.avail_in)>(data_length);
+    strm.next_in = const_cast<Bytef *>(reinterpret_cast<const Bytef *>(data));
+
+    std::array<char, 16384> buff{};
+    do {
+      strm.avail_out = buff.size();
+      strm.next_out = reinterpret_cast<Bytef *>(buff.data());
+
+      ret = inflate(&strm, Z_NO_FLUSH);
+      assert(ret != Z_STREAM_ERROR);
+      switch (ret) {
+      case Z_NEED_DICT:
+      case Z_DATA_ERROR:
+      case Z_MEM_ERROR: inflateEnd(&strm); return false;
+      }
+
+      if (!callback(buff.data(), buff.size() - strm.avail_out)) {
+        return false;
+      }
+    } while (strm.avail_out == 0);
+
+    return ret == Z_OK || ret == Z_STREAM_END;
+  }
+
+private:
+  bool is_valid_;
+  z_stream strm;
+};
+#endif
+
+inline bool has_header(const Headers &headers, const char *key) {
+  return headers.find(key) != headers.end();
+}
+
+inline const char *get_header_value(const Headers &headers, const char *key,
+                                    size_t id = 0, const char *def = nullptr) {
+  auto it = headers.find(key);
+  std::advance(it, static_cast<int>(id));
+  if (it != headers.end()) { return it->second.c_str(); }
+  return def;
+}
+
+inline uint64_t get_header_value_uint64(const Headers &headers, const char *key,
+                                        uint64_t def = 0) {
+  auto it = headers.find(key);
+  if (it != headers.end()) {
+    return std::strtoull(it->second.data(), nullptr, 10);
+  }
+  return def;
+}
+
+inline bool read_headers(Stream &strm, Headers &headers) {
+  const auto bufsiz = 2048;
+  char buf[bufsiz];
+  stream_line_reader line_reader(strm, buf, bufsiz);
+
+  for (;;) {
+    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 ]*([^\t ].*))");
+
+    std::cmatch m;
+    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);
+    }
+  }
+
+  return true;
+}
+
+inline bool read_content_with_length(Stream &strm, uint64_t len,
+                                     Progress progress, ContentReceiver out) {
+  char buf[CPPHTTPLIB_RECV_BUFSIZ];
+
+  uint64_t r = 0;
+  while (r < len) {
+    auto read_len = static_cast<size_t>(len - r);
+    auto n = strm.read(buf, (std::min)(read_len, CPPHTTPLIB_RECV_BUFSIZ));
+    if (n <= 0) { return false; }
+
+    if (!out(buf, static_cast<size_t>(n))) { return false; }
+
+    r += static_cast<uint64_t>(n);
+
+    if (progress) {
+      if (!progress(r, len)) { return false; }
+    }
+  }
+
+  return true;
+}
+
+inline void skip_content_with_length(Stream &strm, uint64_t len) {
+  char buf[CPPHTTPLIB_RECV_BUFSIZ];
+  uint64_t r = 0;
+  while (r < len) {
+    auto read_len = static_cast<size_t>(len - r);
+    auto n = strm.read(buf, (std::min)(read_len, CPPHTTPLIB_RECV_BUFSIZ));
+    if (n <= 0) { return; }
+    r += static_cast<uint64_t>(n);
+  }
+}
+
+inline bool read_content_without_length(Stream &strm, ContentReceiver out) {
+  char buf[CPPHTTPLIB_RECV_BUFSIZ];
+  for (;;) {
+    auto n = strm.read(buf, CPPHTTPLIB_RECV_BUFSIZ);
+    if (n < 0) {
+      return false;
+    } else if (n == 0) {
+      return true;
+    }
+    if (!out(buf, static_cast<size_t>(n))) { return false; }
+  }
+
+  return true;
+}
+
+inline bool read_content_chunked(Stream &strm, ContentReceiver out) {
+  const auto bufsiz = 16;
+  char buf[bufsiz];
+
+  stream_line_reader line_reader(strm, buf, bufsiz);
+
+  if (!line_reader.getline()) { return false; }
+
+  unsigned long chunk_len;
+  while (true) {
+    char *end_ptr;
+
+    chunk_len = std::strtoul(line_reader.ptr(), &end_ptr, 16);
+
+    if (end_ptr == line_reader.ptr()) { return false; }
+    if (chunk_len == ULONG_MAX) { return false; }
+
+    if (chunk_len == 0) { break; }
+
+    if (!read_content_with_length(strm, chunk_len, nullptr, out)) {
+      return false;
+    }
+
+    if (!line_reader.getline()) { return false; }
+
+    if (strcmp(line_reader.ptr(), "\r\n")) { break; }
+
+    if (!line_reader.getline()) { return false; }
+  }
+
+  if (chunk_len == 0) {
+    // Reader terminator after chunks
+    if (!line_reader.getline() || strcmp(line_reader.ptr(), "\r\n"))
+      return false;
+  }
+
+  return true;
+}
+
+inline bool is_chunked_transfer_encoding(const Headers &headers) {
+  return !strcasecmp(get_header_value(headers, "Transfer-Encoding", 0, ""),
+                     "chunked");
+}
+
+template <typename T>
+bool read_content(Stream &strm, T &x, size_t payload_max_length, int &status,
+                  Progress progress, ContentReceiver receiver) {
+
+  ContentReceiver out = [&](const char *buf, size_t n) {
+    return receiver(buf, n);
+  };
+
+#ifdef CPPHTTPLIB_ZLIB_SUPPORT
+  decompressor decompressor;
+
+  std::string content_encoding = x.get_header_value("Content-Encoding");
+  if (content_encoding.find("gzip") != std::string::npos ||
+      content_encoding.find("deflate") != std::string::npos) {
+    if (!decompressor.is_valid()) {
+      status = 500;
+      return false;
+    }
+
+    out = [&](const char *buf, size_t n) {
+      return decompressor.decompress(
+          buf, n, [&](const char *buf, size_t n) { return receiver(buf, n); });
+    };
+  }
+#else
+  if (x.get_header_value("Content-Encoding") == "gzip") {
+    status = 415;
+    return false;
+  }
+#endif
+
+  auto ret = true;
+  auto exceed_payload_max_length = false;
+
+  if (is_chunked_transfer_encoding(x.headers)) {
+    ret = read_content_chunked(strm, out);
+  } else if (!has_header(x.headers, "Content-Length")) {
+    ret = read_content_without_length(strm, out);
+  } else {
+    auto len = get_header_value_uint64(x.headers, "Content-Length", 0);
+    if (len > payload_max_length) {
+      exceed_payload_max_length = true;
+      skip_content_with_length(strm, len);
+      ret = false;
+    } else if (len > 0) {
+      ret = read_content_with_length(strm, len, progress, out);
+    }
+  }
+
+  if (!ret) { status = exceed_payload_max_length ? 413 : 400; }
+
+  return ret;
+}
+
+template <typename T>
+inline ssize_t write_headers(Stream &strm, const T &info,
+                             const Headers &headers) {
+  ssize_t write_len = 0;
+  for (const auto &x : info.headers) {
+    if (x.first == "EXCEPTION_WHAT") { continue; }
+    auto len =
+        strm.write_format("%s: %s\r\n", x.first.c_str(), x.second.c_str());
+    if (len < 0) { return len; }
+    write_len += len;
+  }
+  for (const auto &x : headers) {
+    auto len =
+        strm.write_format("%s: %s\r\n", x.first.c_str(), x.second.c_str());
+    if (len < 0) { return len; }
+    write_len += len;
+  }
+  auto len = strm.write("\r\n");
+  if (len < 0) { return len; }
+  write_len += len;
+  return write_len;
+}
+
+inline ssize_t write_content(Stream &strm, ContentProvider content_provider,
+                             size_t offset, size_t length) {
+  size_t begin_offset = offset;
+  size_t end_offset = offset + length;
+  while (offset < end_offset) {
+    ssize_t written_length = 0;
+
+    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,
+                                     T is_shutting_down) {
+  size_t offset = 0;
+  auto data_available = true;
+  ssize_t total_written_length = 0;
+  while (data_available && !is_shutting_down()) {
+    ssize_t written_length = 0;
+
+    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;
+  }
+  return total_written_length;
+}
+
+template <typename T>
+inline bool redirect(T &cli, const Request &req, Response &res,
+                     const std::string &path) {
+  Request new_req = req;
+  new_req.path = path;
+  new_req.redirect_count -= 1;
+
+  if (res.status == 303 && (req.method != "GET" && req.method != "HEAD")) {
+    new_req.method = "GET";
+    new_req.body.clear();
+    new_req.headers.clear();
+  }
+
+  Response new_res;
+
+  auto ret = cli.send(new_req, new_res);
+  if (ret) { res = new_res; }
+  return ret;
+}
+
+inline std::string encode_url(const std::string &s) {
+  std::string result;
+
+  for (size_t i = 0; s[i]; i++) {
+    switch (s[i]) {
+    case ' ': result += "%20"; break;
+    case '+': result += "%2B"; break;
+    case '\r': result += "%0D"; break;
+    case '\n': result += "%0A"; break;
+    case '\'': result += "%27"; break;
+    case ',': result += "%2C"; break;
+    // case ':': result += "%3A"; break; // ok? probably...
+    case ';': result += "%3B"; break;
+    default:
+      auto c = static_cast<uint8_t>(s[i]);
+      if (c >= 0x80) {
+        result += '%';
+        char hex[4];
+        auto len = snprintf(hex, sizeof(hex) - 1, "%02X", c);
+        assert(len == 2);
+        result.append(hex, static_cast<size_t>(len));
+      } else {
+        result += s[i];
+      }
+      break;
+    }
+  }
+
+  return result;
+}
+
+inline std::string decode_url(const std::string &s,
+                              bool convert_plus_to_space) {
+  std::string result;
+
+  for (size_t i = 0; i < s.size(); i++) {
+    if (s[i] == '%' && i + 1 < s.size()) {
+      if (s[i + 1] == 'u') {
+        int val = 0;
+        if (from_hex_to_i(s, i + 2, 4, val)) {
+          // 4 digits Unicode codes
+          char buff[4];
+          size_t len = to_utf8(val, buff);
+          if (len > 0) { result.append(buff, len); }
+          i += 5; // 'u0000'
+        } else {
+          result += s[i];
+        }
+      } else {
+        int val = 0;
+        if (from_hex_to_i(s, i + 1, 2, val)) {
+          // 2 digits hex codes
+          result += static_cast<char>(val);
+          i += 2; // '00'
+        } else {
+          result += s[i];
+        }
+      }
+    } else if (convert_plus_to_space && s[i] == '+') {
+      result += ' ';
+    } else {
+      result += s[i];
+    }
+  }
+
+  return result;
+}
+
+inline std::string params_to_query_str(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 query;
+}
+
+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 *b2, const char *e2) {
+      if (key.empty()) {
+        key.assign(b2, e2);
+      } else {
+        val.assign(b2, e2);
+      }
+    });
+    params.emplace(decode_url(key, true), decode_url(val, true));
+  });
+}
+
+inline bool parse_multipart_boundary(const std::string &content_type,
+                                     std::string &boundary) {
+  auto pos = content_type.find("boundary=");
+  if (pos == std::string::npos) { return false; }
+
+  boundary = content_type.substr(pos + 9);
+  return true;
+}
+
+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 = static_cast<size_t>(m.position(1));
+    auto len = static_cast<size_t>(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)));
+        }
+
+        ssize_t last = -1;
+        if (!cm.str(2).empty()) {
+          last = static_cast<ssize_t>(std::stoll(cm.str(2)));
+        }
+
+        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;
+}
+
+class MultipartFormDataParser {
+public:
+  MultipartFormDataParser() = default;
+
+  void set_boundary(std::string boundary) { boundary_ = std::move(boundary); }
+
+  bool is_valid() const { return is_valid_; }
+
+  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);
+    static const std::string dash_ = "--";
+    static const std::string crlf_ = "\r\n";
+
+    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;
+          }
+
+          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];
+            }
+          }
+
+          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;
+          }
+
+          off_ += pos;
+          buf_.erase(0, 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;
+            }
+
+            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;
+            }
+
+            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;
+      }
+      }
+    }
+
+    return true;
+  }
+
+private:
+  void clear_file_info() {
+    file_.name.clear();
+    file_.filename.clear();
+    file_.content_type.clear();
+  }
+
+  std::string boundary_;
+
+  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;
+  auto it = beg;
+  while (it != end) {
+    out += static_cast<char>(::tolower(*it));
+    it++;
+  }
+  return out;
+}
+
+inline std::string make_multipart_data_boundary() {
+  static const char data[] =
+      "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+
+  std::random_device seed_gen;
+  std::mt19937 engine(seed_gen());
+
+  std::string result = "--cpp-httplib-multipart-data-";
+
+  for (auto i = 0; i < 16; i++) {
+    result += data[engine() % (sizeof(data) - 1)];
+  }
+
+  return result;
+}
+
+inline std::pair<size_t, size_t>
+get_range_offset_and_length(const Request &req, size_t content_length,
+                            size_t index) {
+  auto r = req.ranges[index];
+
+  if (r.first == -1 && r.second == -1) {
+    return std::make_pair(0, content_length);
+  }
+
+  auto slen = static_cast<ssize_t>(content_length);
+
+  if (r.first == -1) {
+    r.first = slen - r.second;
+    r.second = slen - 1;
+  }
+
+  if (r.second == -1) { r.second = slen - 1; }
+
+  return std::make_pair(r.first, r.second - r.first + 1);
+}
+
+inline std::string make_content_range_header_field(size_t offset, size_t length,
+                                                   size_t content_length) {
+  std::string field = "bytes ";
+  field += std::to_string(offset);
+  field += "-";
+  field += std::to_string(offset + length - 1);
+  field += "/";
+  field += std::to_string(content_length);
+  return field;
+}
+
+template <typename SToken, typename CToken, typename Content>
+bool process_multipart_ranges_data(const Request &req, Response &res,
+                                   const std::string &boundary,
+                                   const std::string &content_type,
+                                   SToken stoken, CToken ctoken,
+                                   Content content) {
+  for (size_t i = 0; i < req.ranges.size(); i++) {
+    ctoken("--");
+    stoken(boundary);
+    ctoken("\r\n");
+    if (!content_type.empty()) {
+      ctoken("Content-Type: ");
+      stoken(content_type);
+      ctoken("\r\n");
+    }
+
+    auto offsets = get_range_offset_and_length(req, res.body.size(), i);
+    auto offset = offsets.first;
+    auto length = offsets.second;
+
+    ctoken("Content-Range: ");
+    stoken(make_content_range_header_field(offset, length, res.body.size()));
+    ctoken("\r\n");
+    ctoken("\r\n");
+    if (!content(offset, length)) { return false; }
+    ctoken("\r\n");
+  }
+
+  ctoken("--");
+  stoken(boundary);
+  ctoken("--\r\n");
+
+  return true;
+}
+
+inline std::string make_multipart_ranges_data(const Request &req, Response &res,
+                                              const std::string &boundary,
+                                              const std::string &content_type) {
+  std::string data;
+
+  process_multipart_ranges_data(
+      req, res, boundary, content_type,
+      [&](const std::string &token) { data += token; },
+      [&](const char *token) { data += token; },
+      [&](size_t offset, size_t length) {
+        data += res.body.substr(offset, length);
+        return true;
+      });
+
+  return data;
+}
+
+inline size_t
+get_multipart_ranges_data_length(const Request &req, Response &res,
+                                 const std::string &boundary,
+                                 const std::string &content_type) {
+  size_t data_length = 0;
+
+  process_multipart_ranges_data(
+      req, res, boundary, content_type,
+      [&](const std::string &token) { data_length += token.size(); },
+      [&](const char *token) { data_length += strlen(token); },
+      [&](size_t /*offset*/, size_t length) {
+        data_length += length;
+        return true;
+      });
+
+  return data_length;
+}
+
+inline bool write_multipart_ranges_data(Stream &strm, const Request &req,
+                                        Response &res,
+                                        const std::string &boundary,
+                                        const std::string &content_type) {
+  return process_multipart_ranges_data(
+      req, res, boundary, content_type,
+      [&](const std::string &token) { strm.write(token); },
+      [&](const char *token) { strm.write(token); },
+      [&](size_t offset, size_t length) {
+        return write_content(strm, res.content_provider, offset, length) >= 0;
+      });
+}
+
+inline std::pair<size_t, size_t>
+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 = static_cast<ssize_t>(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" || req.method == "DELETE") {
+    return true;
+  }
+  // TODO: check if Content-Length is set
+  return false;
+}
+
+inline bool has_crlf(const char *s) {
+  auto p = s;
+  while (*p) {
+    if (*p == '\r' || *p == '\n') { return true; }
+    p++;
+  }
+  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:
+  WSInit() {
+    WSADATA wsaData;
+    WSAStartup(0x0002, &wsaData);
+  }
+
+  ~WSInit() { WSACleanup(); }
+};
+
+static WSInit wsinit_;
+#endif
+
+} // namespace detail
+
+// Header utilities
+inline std::pair<std::string, std::string> make_range_header(Ranges ranges) {
+  std::string field = "bytes=";
+  auto i = 0;
+  for (auto r : ranges) {
+    if (i != 0) { field += ", "; }
+    if (r.first != -1) { field += std::to_string(r.first); }
+    field += '-';
+    if (r.second != -1) { field += std::to_string(r.second); }
+    i++;
+  }
+  return std::make_pair("Range", field);
+}
+
+inline std::pair<std::string, std::string>
+make_basic_authentication_header(const std::string &username,
+                                 const std::string &password,
+                                 bool is_proxy = false) {
+  auto field = "Basic " + detail::base64_encode(username + ":" + password);
+  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(static_cast<size_t>(m.position(1)),
+                              static_cast<size_t>(m.length(1)));
+          auto val = m.length(2) > 0
+                         ? s.substr(static_cast<size_t>(m.position(2)),
+                                    static_cast<size_t>(m.length(2)))
+                         : s.substr(static_cast<size_t>(m.position(3)),
+                                    static_cast<size_t>(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[static_cast<size_t>(rand()) % max_index];
+  };
+  std::string str(length, 0);
+  std::generate_n(str.begin(), length, randchar);
+  return str;
+}
+
+// Request implementation
+inline bool Request::has_header(const char *key) const {
+  return detail::has_header(headers, key);
+}
+
+inline std::string Request::get_header_value(const char *key, size_t id) const {
+  return detail::get_header_value(headers, key, id, "");
+}
+
+inline size_t Request::get_header_value_count(const char *key) const {
+  auto r = headers.equal_range(key);
+  return static_cast<size_t>(std::distance(r.first, r.second));
+}
+
+inline void Request::set_header(const char *key, const char *val) {
+  if (!detail::has_crlf(key) && !detail::has_crlf(val)) {
+    headers.emplace(key, val);
+  }
+}
+
+inline void Request::set_header(const char *key, const std::string &val) {
+  if (!detail::has_crlf(key) && !detail::has_crlf(val.c_str())) {
+    headers.emplace(key, val);
+  }
+}
+
+inline bool Request::has_param(const char *key) const {
+  return params.find(key) != params.end();
+}
+
+inline std::string Request::get_param_value(const char *key, size_t id) const {
+  auto it = params.find(key);
+  std::advance(it, static_cast<ssize_t>(id));
+  if (it != params.end()) { return it->second; }
+  return std::string();
+}
+
+inline size_t Request::get_param_value_count(const char *key) const {
+  auto r = params.equal_range(key);
+  return static_cast<size_t>(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 MultipartFormData Request::get_file_value(const char *key) const {
+  auto it = files.find(key);
+  if (it != files.end()) { return it->second; }
+  return MultipartFormData();
+}
+
+// Response implementation
+inline bool Response::has_header(const char *key) const {
+  return headers.find(key) != headers.end();
+}
+
+inline std::string Response::get_header_value(const char *key,
+                                              size_t id) const {
+  return detail::get_header_value(headers, key, id, "");
+}
+
+inline size_t Response::get_header_value_count(const char *key) const {
+  auto r = headers.equal_range(key);
+  return static_cast<size_t>(std::distance(r.first, r.second));
+}
+
+inline void Response::set_header(const char *key, const char *val) {
+  if (!detail::has_crlf(key) && !detail::has_crlf(val)) {
+    headers.emplace(key, val);
+  }
+}
+
+inline void Response::set_header(const char *key, const std::string &val) {
+  if (!detail::has_crlf(key) && !detail::has_crlf(val.c_str())) {
+    headers.emplace(key, val);
+  }
+}
+
+inline void Response::set_redirect(const char *url, int stat) {
+  if (!detail::has_crlf(url)) {
+    set_header("Location", url);
+    if (300 <= stat && stat < 400) {
+      this->status = stat;
+    } else {
+      this->status = 302;
+    }
+  }
+}
+
+inline void Response::set_content(const char *s, size_t n,
+                                  const char *content_type) {
+  body.assign(s, n);
+  set_header("Content-Type", content_type);
+}
+
+inline void Response::set_content(std::string s, const char *content_type) {
+  body = std::move(s);
+  set_header("Content-Type", content_type);
+}
+
+inline void Response::set_content_provider(
+    size_t in_length,
+    std::function<void(size_t offset, size_t length, DataSink &sink)> provider,
+    std::function<void()> resource_releaser) {
+  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)> provider,
+    std::function<void()> resource_releaser) {
+  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 ssize_t Stream::write(const char *ptr) {
+  return write(ptr, strlen(ptr));
+}
+
+inline ssize_t Stream::write(const std::string &s) {
+  return write(s.data(), s.size());
+}
+
+template <typename... Args>
+inline ssize_t Stream::write_format(const char *fmt, const Args &... args) {
+  std::array<char, 2048> buf;
+
+#if defined(_MSC_VER) && _MSC_VER < 1900
+  auto sn = _snprintf_s(buf, bufsiz, buf.size() - 1, fmt, args...);
+#else
+  auto sn = snprintf(buf.data(), buf.size() - 1, fmt, args...);
+#endif
+  if (sn <= 0) { return sn; }
+
+  auto n = static_cast<size_t>(sn);
+
+  if (n >= buf.size() - 1) {
+    std::vector<char> glowable_buf(buf.size());
+
+    while (n >= glowable_buf.size() - 1) {
+      glowable_buf.resize(glowable_buf.size() * 2);
+#if defined(_MSC_VER) && _MSC_VER < 1900
+      n = static_cast<size_t>(_snprintf_s(&glowable_buf[0], glowable_buf.size(),
+                                          glowable_buf.size() - 1, fmt,
+                                          args...));
+#else
+      n = static_cast<size_t>(
+          snprintf(&glowable_buf[0], glowable_buf.size() - 1, fmt, args...));
+#endif
+    }
+    return write(&glowable_buf[0], n);
+  } else {
+    return write(buf.data(), n);
+  }
+}
+
+namespace detail {
+
+// Socket stream implementation
+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 bool SocketStream::is_readable() const {
+  return select_read(sock_, read_timeout_sec_, read_timeout_usec_) > 0;
+}
+
+inline bool SocketStream::is_writable() const {
+  return select_write(sock_, 0, 0) > 0;
+}
+
+inline ssize_t SocketStream::read(char *ptr, size_t size) {
+  if (!is_readable()) { return -1; }
+
+#ifdef _WIN32
+  if (size > static_cast<size_t>(std::numeric_limits<int>::max())) {
+    return -1;
+  }
+  return recv(sock_, ptr, static_cast<int>(size), 0);
+#else
+  return HANDLE_EINTR(recv, sock_, ptr, size, 0);
+#endif
+}
+
+inline ssize_t SocketStream::write(const char *ptr, size_t size) {
+  if (!is_writable()) { return -1; }
+
+#ifdef _WIN32
+  if (size > static_cast<size_t>(std::numeric_limits<int>::max())) {
+    return -1;
+  }
+  return send(sock_, ptr, static_cast<int>(size), 0);
+#else
+  return HANDLE_EINTR(send, sock_, ptr, size, 0);
+#endif
+}
+
+inline void SocketStream::get_remote_ip_and_port(std::string &ip,
+                                                 int &port) const {
+  return detail::get_remote_ip_and_port(sock_, ip, port);
+}
+
+// Buffer stream implementation
+inline bool BufferStream::is_readable() const { return true; }
+
+inline bool BufferStream::is_writable() const { return true; }
+
+inline ssize_t BufferStream::read(char *ptr, size_t size) {
+#if defined(_MSC_VER) && _MSC_VER < 1900
+  auto len_read = buffer._Copy_s(ptr, size, size, position);
+#else
+  auto len_read = buffer.copy(ptr, size, position);
+#endif
+  position += static_cast<size_t>(len_read);
+  return static_cast<ssize_t>(len_read);
+}
+
+inline ssize_t BufferStream::write(const char *ptr, size_t size) {
+  buffer.append(ptr, size);
+  return static_cast<ssize_t>(size);
+}
+
+inline void BufferStream::get_remote_ip_and_port(std::string & /*ip*/,
+                                                 int & /*port*/) const {}
+
+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 = [] { return new ThreadPool(CPPHTTPLIB_THREAD_POOL_COUNT); };
+}
+
+inline Server::~Server() {}
+
+inline Server &Server::Get(const char *pattern, Handler handler) {
+  get_handlers_.push_back(std::make_pair(std::regex(pattern), handler));
+  return *this;
+}
+
+inline Server &Server::Post(const char *pattern, Handler handler) {
+  post_handlers_.push_back(std::make_pair(std::regex(pattern), 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;
+}
+
+inline Server &Server::Delete(const char *pattern,
+                              HandlerWithContentReader handler) {
+  delete_handlers_for_content_reader_.push_back(
+      std::make_pair(std::regex(pattern), handler));
+  return *this;
+}
+
+inline Server &Server::Options(const char *pattern, Handler handler) {
+  options_handlers_.push_back(std::make_pair(std::regex(pattern), handler));
+  return *this;
+}
+
+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_ = std::move(handler);
+}
+
+inline void Server::set_error_handler(Handler handler) {
+  error_handler_ = std::move(handler);
+}
+
+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);
+}
+
+inline bool Server::listen_after_bind() { return listen_internal(); }
+
+inline bool Server::listen(const char *host, int port, int socket_flags) {
+  return bind_to_port(host, port, socket_flags) && listen_internal();
+}
+
+inline bool Server::is_running() const { return is_running_; }
+
+inline void Server::stop() {
+  if (is_running_) {
+    assert(svr_sock_ != INVALID_SOCKET);
+    std::atomic<socket_t> sock(svr_sock_.exchange(INVALID_SOCKET));
+    detail::shutdown_socket(sock);
+    detail::close_socket(sock);
+  }
+}
+
+inline bool Server::parse_request_line(const char *s, Request &req) {
+  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)) {
+    req.version = std::string(m[5]);
+    req.method = std::string(m[1]);
+    req.target = std::string(m[2]);
+    req.path = detail::decode_url(m[3], false);
+
+    // Parse query text
+    auto len = std::distance(m[4].first, m[4].second);
+    if (len > 0) { detail::parse_query_text(m[4], req.params); }
+
+    return true;
+  }
+
+  return false;
+}
+
+inline bool Server::write_response(Stream &strm, bool last_connection,
+                                   const Request &req, Response &res) {
+  assert(res.status != -1);
+
+  if (400 <= res.status && error_handler_) { error_handler_(req, res); }
+
+  detail::BufferStream bstrm;
+
+  // Response line
+  if (!bstrm.write_format("HTTP/1.1 %d %s\r\n", res.status,
+                          detail::status_message(res.status))) {
+    return false;
+  }
+
+  // Headers
+  if (last_connection || req.get_header_value("Connection") == "close") {
+    res.set_header("Connection", "close");
+  }
+
+  if (!last_connection && req.get_header_value("Connection") == "Keep-Alive") {
+    res.set_header("Connection", "Keep-Alive");
+  }
+
+  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") && req.method == "HEAD") {
+    res.set_header("Accept-Ranges", "bytes");
+  }
+
+  std::string content_type;
+  std::string boundary;
+
+  if (req.ranges.size() > 1) {
+    boundary = detail::make_multipart_data_boundary();
+
+    auto it = res.headers.find("Content-Type");
+    if (it != res.headers.end()) {
+      content_type = it->second;
+      res.headers.erase(it);
+    }
+
+    res.headers.emplace("Content-Type",
+                        "multipart/byteranges; boundary=" + boundary);
+  }
+
+  if (res.body.empty()) {
+    if (res.content_length > 0) {
+      size_t length = 0;
+      if (req.ranges.empty()) {
+        length = res.content_length;
+      } else if (req.ranges.size() == 1) {
+        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_length);
+        res.set_header("Content-Range", content_range);
+      } else {
+        length = detail::get_multipart_ranges_data_length(req, res, boundary,
+                                                          content_type);
+      }
+      res.set_header("Content-Length", std::to_string(length));
+    } else {
+      if (res.content_provider) {
+        res.set_header("Transfer-Encoding", "chunked");
+      } else {
+        res.set_header("Content-Length", "0");
+      }
+    }
+  } else {
+    if (req.ranges.empty()) {
+      ;
+    } else if (req.ranges.size() == 1) {
+      auto offsets =
+          detail::get_range_offset_and_length(req, res.body.size(), 0);
+      auto offset = offsets.first;
+      auto length = offsets.second;
+      auto content_range = detail::make_content_range_header_field(
+          offset, length, res.body.size());
+      res.set_header("Content-Range", content_range);
+      res.body = res.body.substr(offset, length);
+    } else {
+      res.body =
+          detail::make_multipart_ranges_data(req, res, boundary, content_type);
+    }
+
+#ifdef CPPHTTPLIB_ZLIB_SUPPORT
+    // 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"))) {
+      if (detail::compress(res.body)) {
+        res.set_header("Content-Encoding", "gzip");
+      }
+    }
+#endif
+
+    auto length = std::to_string(res.body.size());
+    res.set_header("Content-Length", length);
+  }
+
+  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") {
+    if (!res.body.empty()) {
+      if (!strm.write(res.body)) { return false; }
+    } else if (res.content_provider) {
+      if (!write_content_with_provider(strm, req, res, boundary,
+                                       content_type)) {
+        return false;
+      }
+    }
+  }
+
+  // Log
+  if (logger_) { logger_(req, res); }
+
+  return true;
+}
+
+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_length) {
+    if (req.ranges.empty()) {
+      if (detail::write_content(strm, res.content_provider, 0,
+                                res.content_length) < 0) {
+        return false;
+      }
+    } else if (req.ranges.size() == 1) {
+      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) <
+          0) {
+        return false;
+      }
+    } else {
+      if (!detail::write_multipart_ranges_data(strm, req, res, boundary,
+                                               content_type)) {
+        return false;
+      }
+    }
+  } else {
+    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::read_content(Stream &strm, Request &req, Response &res) {
+  MultipartFormDataMap::iterator cur;
+  if (read_content_core(
+          strm, 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;
+          })) {
+    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);
+    }
+    return true;
+  }
+  return false;
+}
+
+inline bool Server::read_content_with_content_receiver(
+    Stream &strm, Request &req, Response &res, ContentReceiver receiver,
+    MultipartContentHeader multipart_header,
+    ContentReceiver multipart_receiver) {
+  return read_content_core(strm, req, res, receiver, multipart_header,
+                           multipart_receiver);
+}
+
+inline bool Server::read_content_core(Stream &strm, 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 false;
+    }
+
+    multipart_form_data_parser.set_boundary(std::move(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 false;
+  }
+
+  if (req.is_multipart_form_data()) {
+    if (!multipart_form_data_parser.is_valid()) {
+      res.status = 400;
+      return false;
+    }
+  }
+
+  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;
+}
+
+inline socket_t Server::create_server_socket(const char *host, int port,
+                                             int socket_flags) const {
+  return detail::create_socket(
+      host, port,
+      [](socket_t sock, struct addrinfo &ai) -> bool {
+        if (::bind(sock, ai.ai_addr, static_cast<socklen_t>(ai.ai_addrlen))) {
+          return false;
+        }
+        if (::listen(sock, 5)) { // Listen through 5 channels
+          return false;
+        }
+        return true;
+      },
+      socket_flags);
+}
+
+inline int Server::bind_internal(const char *host, int port, int socket_flags) {
+  if (!is_valid()) { return -1; }
+
+  svr_sock_ = create_server_socket(host, port, socket_flags);
+  if (svr_sock_ == INVALID_SOCKET) { return -1; }
+
+  if (port == 0) {
+    struct sockaddr_storage addr;
+    socklen_t addr_len = sizeof(addr);
+    if (getsockname(svr_sock_, reinterpret_cast<struct sockaddr *>(&addr),
+                    &addr_len) == -1) {
+      return -1;
+    }
+    if (addr.ss_family == AF_INET) {
+      return ntohs(reinterpret_cast<struct sockaddr_in *>(&addr)->sin_port);
+    } else if (addr.ss_family == AF_INET6) {
+      return ntohs(reinterpret_cast<struct sockaddr_in6 *>(&addr)->sin6_port);
+    } else {
+      return -1;
+    }
+  } else {
+    return port;
+  }
+}
+
+inline bool Server::listen_internal() {
+  auto ret = true;
+  is_running_ = true;
+
+  {
+    std::unique_ptr<TaskQueue> task_queue(new_task_queue());
+
+    for (;;) {
+      if (svr_sock_ == INVALID_SOCKET) {
+        // The server socket was closed by 'stop' method.
+        break;
+      }
+
+      auto val = detail::select_read(svr_sock_, 0, 100000);
+
+      if (val == 0) { // Timeout
+        task_queue->on_idle();
+        continue;
+      }
+
+      socket_t sock = accept(svr_sock_, nullptr, nullptr);
+
+      if (sock == INVALID_SOCKET) {
+        if (errno == EMFILE) {
+          // The per-process limit of open file descriptors has been reached.
+          // Try to accept new connections after a short sleep.
+          std::this_thread::sleep_for(std::chrono::milliseconds(1));
+          continue;
+        }
+        if (svr_sock_ != INVALID_SOCKET) {
+          detail::close_socket(svr_sock_);
+          ret = false;
+        } else {
+          ; // The server socket was closed by user.
+        }
+        break;
+      }
+
+#if __cplusplus > 201703L
+      task_queue->enqueue([=, this]() { process_and_close_socket(sock); });
+#else
+      task_queue->enqueue([=]() { process_and_close_socket(sock); });
+#endif
+    }
+
+    task_queue->shutdown();
+  }
+
+  is_running_ = false;
+  return ret;
+}
+
+inline bool Server::routing(Request &req, Response &res, Stream &strm) {
+  // 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, req, res, receiver,
+                                                      nullptr, nullptr);
+          },
+          [&](MultipartContentHeader header, ContentReceiver receiver) {
+            return read_content_with_content_receiver(strm, 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;
+        }
+      } else if (req.method == "DELETE") {
+        if (dispatch_request_for_content_reader(
+                req, res, reader, delete_handlers_for_content_reader_)) {
+          return true;
+        }
+      }
+    }
+
+    // Read content into `req.body`
+    if (!read_content(strm, 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") {
+    return dispatch_request(req, res, post_handlers_);
+  } else if (req.method == "PUT") {
+    return dispatch_request(req, res, put_handlers_);
+  } else if (req.method == "DELETE") {
+    return dispatch_request(req, res, delete_handlers_);
+  } else if (req.method == "OPTIONS") {
+    return dispatch_request(req, res, options_handlers_);
+  } else if (req.method == "PATCH") {
+    return dispatch_request(req, res, patch_handlers_);
+  }
+
+  res.status = 400;
+  return false;
+}
+
+inline bool Server::dispatch_request(Request &req, Response &res,
+                                     Handlers &handlers) {
+
+  try {
+    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);
+        return true;
+      }
+    }
+  } catch (const std::exception &ex) {
+    res.status = 500;
+    res.set_header("EXCEPTION_WHAT", ex.what());
+  } catch (...) {
+    res.status = 500;
+    res.set_header("EXCEPTION_WHAT", "UNKNOWN");
+  }
+  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,
+                        const std::function<void(Request &)> &setup_request) {
+  std::array<char, 2048> buf{};
+
+  detail::stream_line_reader line_reader(strm, buf.data(), buf.size());
+
+  // Connection has been closed on client
+  if (!line_reader.getline()) { return false; }
+
+  Request req;
+  Response res;
+
+  res.version = "HTTP/1.1";
+
+  // Check if the request URI doesn't exceed the limit
+  if (line_reader.size() > CPPHTTPLIB_REQUEST_URI_MAX_LENGTH) {
+    Headers dummy;
+    detail::read_headers(strm, dummy);
+    res.status = 414;
+    return write_response(strm, last_connection, req, res);
+  }
+
+  // Request line and headers
+  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);
+  }
+
+  if (req.get_header_value("Connection") == "close") {
+    connection_close = true;
+  }
+
+  if (req.version == "HTTP/1.0" &&
+      req.get_header_value("Connection") != "Keep-Alive") {
+    connection_close = true;
+  }
+
+  strm.get_remote_ip_and_port(req.remote_addr, req.remote_port);
+  req.set_header("REMOTE_ADDR", req.remote_addr);
+  req.set_header("REMOTE_PORT", std::to_string(req.remote_port));
+
+  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)) {
+      // TODO: error
+    }
+  }
+
+  if (setup_request) { setup_request(req); }
+
+  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)) {
+    if (res.status == -1) { res.status = req.ranges.empty() ? 200 : 206; }
+  } else {
+    if (res.status == -1) { res.status = 404; }
+  }
+
+  return write_response(strm, last_connection, req, res);
+}
+
+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_, read_timeout_sec_, read_timeout_usec_,
+      [this](Stream &strm, bool last_connection, bool &connection_close) {
+        return process_request(strm, last_connection, connection_close,
+                               nullptr);
+      });
+}
+
+// HTTP client implementation
+inline Client::Client(const std::string &host, int port,
+                      const std::string &client_cert_path,
+                      const std::string &client_key_path)
+    : sock_(INVALID_SOCKET), host_(host), port_(port),
+      host_and_port_(host_ + ":" + std::to_string(port_)),
+      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 {
+  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) {
+  std::array<char, 2048> buf;
+
+  detail::stream_line_reader line_reader(strm, buf.data(), buf.size());
+
+  if (!line_reader.getline()) { return false; }
+
+  const static std::regex re("(HTTP/1\\.[01]) (\\d+?) .*\r\n");
+
+  std::cmatch m;
+  if (std::regex_match(line_reader.ptr(), m, re)) {
+    res.version = std::string(m[1]);
+    res.status = std::stoi(std::string(m[2]));
+  }
+
+  return true;
+}
+
+inline bool Client::send(const Request &req, Response &res) {
+  sock_ = create_client_socket();
+  if (sock_ == INVALID_SOCKET) { return false; }
+
+#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
+  if (is_ssl() && !proxy_host_.empty()) {
+    bool error;
+    if (!connect(sock_, res, error)) { return error; }
+  }
+#endif
+
+  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,
+                         std::vector<Response> &responses) {
+  size_t i = 0;
+  while (i < requests.size()) {
+    sock_ = create_client_socket();
+    if (sock_ == INVALID_SOCKET) { return false; }
+
+#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;
+    }
+  }
+
+  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);
+  }
+
+#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;
+}
+
+#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;
+  }
+
+  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; }
+
+  auto location = res.get_header_value("location");
+  if (location.empty()) { return false; }
+
+  const static std::regex re(
+      R"(^(?:(https?):)?(?://([^:/?#]*)(?::(\d+))?)?([^?#]*(?:\?[^#]*)?)(?:#.*)?)");
+
+  std::smatch m;
+  if (!std::regex_match(location, m, re)) { return false; }
+
+  auto scheme = is_ssl() ? "https" : "http";
+
+  auto next_scheme = m[1].str();
+  auto next_host = m[2].str();
+  auto port_str = m[3].str();
+  auto next_path = m[4].str();
+
+  auto next_port = port_;
+  if (!port_str.empty()) {
+    next_port = std::stoi(port_str);
+  } else if (!next_scheme.empty()) {
+    next_port = next_scheme == "https" ? 443 : 80;
+  }
+
+  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_ && next_port == port_) {
+    return detail::redirect(*this, req, res, next_path);
+  } else {
+    if (next_scheme == "https") {
+#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
+      SSLClient cli(next_host.c_str(), next_port);
+      cli.copy_settings(*this);
+      return detail::redirect(cli, req, res, next_path);
+#else
+      return false;
+#endif
+    } else {
+      Client cli(next_host.c_str(), next_port);
+      cli.copy_settings(*this);
+      return detail::redirect(cli, req, res, next_path);
+    }
+  }
+}
+
+inline bool Client::write_request(Stream &strm, const Request &req,
+                                  bool last_connection) {
+  detail::BufferStream bstrm;
+
+  // Request line
+  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());
+
+  // Additonal headers
+  Headers headers;
+  if (last_connection) { headers.emplace("Connection", "close"); }
+
+  if (!req.has_header("Host")) {
+    if (is_ssl()) {
+      if (port_ == 443) {
+        headers.emplace("Host", host_);
+      } else {
+        headers.emplace("Host", host_and_port_);
+      }
+    } else {
+      if (port_ == 80) {
+        headers.emplace("Host", host_);
+      } else {
+        headers.emplace("Host", host_and_port_);
+      }
+    }
+  }
+
+  if (!req.has_header("Accept")) { headers.emplace("Accept", "*/*"); }
+
+  if (!req.has_header("User-Agent")) {
+    headers.emplace("User-Agent", "cpp-httplib/0.5");
+  }
+
+  if (req.body.empty()) {
+    if (req.content_provider) {
+      auto length = std::to_string(req.content_length);
+      headers.emplace("Content-Length", length);
+    } else {
+      headers.emplace("Content-Length", "0");
+    }
+  } else {
+    if (!req.has_header("Content-Type")) {
+      headers.emplace("Content-Type", "text/plain");
+    }
+
+    if (!req.has_header("Content-Length")) {
+      auto length = std::to_string(req.body.size());
+      headers.emplace("Content-Length", length);
+    }
+  }
+
+  if (!basic_auth_username_.empty() && !basic_auth_password_.empty()) {
+    headers.insert(make_basic_authentication_header(
+        basic_auth_username_, basic_auth_password_, false));
+  }
+
+  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 += static_cast<size_t>(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;
+
+  if (content_type) { 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
+  if (!write_request(strm, req, last_connection)) { return false; }
+
+  // Receive response and headers
+  if (!read_response_line(strm, res) ||
+      !detail::read_headers(strm, res.headers)) {
+    return false;
+  }
+
+  if (res.get_header_value("Connection") == "close" ||
+      res.version == "HTTP/1.0") {
+    connection_close = true;
+  }
+
+  if (req.response_handler) {
+    if (!req.response_handler(res)) { return false; }
+  }
+
+  // Body
+  if (req.method != "HEAD" && req.method != "CONNECT") {
+    auto out =
+        req.content_receiver
+            ? static_cast<ContentReceiver>([&](const char *buf, size_t n) {
+                return req.content_receiver(buf, n);
+              })
+            : static_cast<ContentReceiver>([&](const char *buf, size_t n) {
+                if (res.body.size() + n > res.body.max_size()) { return false; }
+                res.body.append(buf, n);
+                return true;
+              });
+
+    int dummy_status;
+    if (!detail::read_content(strm, res, (std::numeric_limits<size_t>::max)(),
+                              dummy_status, req.progress, out)) {
+      return false;
+    }
+  }
+
+  // Log
+  if (logger_) { logger_(req, res); }
+
+  return true;
+}
+
+inline bool Client::process_and_close_socket(
+    socket_t sock, size_t request_count,
+    std::function<bool(Stream &strm, bool last_connection,
+                       bool &connection_close)>
+        callback) {
+  request_count = (std::min)(request_count, keep_alive_max_count_);
+  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) {
+  return Get(path, Headers(), Progress());
+}
+
+inline std::shared_ptr<Response> Client::Get(const char *path,
+                                             Progress progress) {
+  return Get(path, Headers(), std::move(progress));
+}
+
+inline std::shared_ptr<Response> Client::Get(const char *path,
+                                             const Headers &headers) {
+  return Get(path, headers, Progress());
+}
+
+inline std::shared_ptr<Response>
+Client::Get(const char *path, const Headers &headers, Progress progress) {
+  Request req;
+  req.method = "GET";
+  req.path = path;
+  req.headers = headers;
+  req.progress = std::move(progress);
+
+  auto res = std::make_shared<Response>();
+  return send(req, *res) ? res : nullptr;
+}
+
+inline std::shared_ptr<Response> Client::Get(const char *path,
+                                             ContentReceiver content_receiver) {
+  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, std::move(content_receiver),
+             std::move(progress));
+}
+
+inline std::shared_ptr<Response> Client::Get(const char *path,
+                                             const Headers &headers,
+                                             ContentReceiver content_receiver) {
+  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, 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) {
+  return Get(path, headers, std::move(response_handler), content_receiver,
+             Progress());
+}
+
+inline std::shared_ptr<Response> Client::Get(const char *path,
+                                             const Headers &headers,
+                                             ResponseHandler response_handler,
+                                             ContentReceiver content_receiver,
+                                             Progress progress) {
+  Request req;
+  req.method = "GET";
+  req.path = path;
+  req.headers = headers;
+  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;
+}
+
+inline std::shared_ptr<Response> Client::Head(const char *path) {
+  return Head(path, Headers());
+}
+
+inline std::shared_ptr<Response> Client::Head(const char *path,
+                                              const Headers &headers) {
+  Request req;
+  req.method = "HEAD";
+  req.headers = headers;
+  req.path = path;
+
+  auto res = std::make_shared<Response>();
+
+  return send(req, *res) ? res : nullptr;
+}
+
+inline std::shared_ptr<Response> Client::Post(const char *path) {
+  return Post(path, std::string(), nullptr);
+}
+
+inline std::shared_ptr<Response> Client::Post(const char *path,
+                                              const std::string &body,
+                                              const char *content_type) {
+  return Post(path, Headers(), body, content_type);
+}
+
+inline std::shared_ptr<Response> Client::Post(const char *path,
+                                              const Headers &headers,
+                                              const std::string &body,
+                                              const char *content_type) {
+  return send_with_content_provider("POST", path, headers, body, 0, nullptr,
+                                    content_type);
+}
+
+inline std::shared_ptr<Response> Client::Post(const char *path,
+                                              const Params &params) {
+  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) {
+  auto query = detail::params_to_query_str(params);
+  return Post(path, headers, query, "application/x-www-form-urlencoded");
+}
+
+inline std::shared_ptr<Response>
+Client::Post(const char *path, const MultipartFormDataItems &items) {
+  return Post(path, Headers(), items);
+}
+
+inline std::shared_ptr<Response>
+Client::Post(const char *path, const Headers &headers,
+             const MultipartFormDataItems &items) {
+  auto boundary = detail::make_multipart_data_boundary();
+
+  std::string body;
+
+  for (const auto &item : items) {
+    body += "--" + boundary + "\r\n";
+    body += "Content-Disposition: form-data; name=\"" + item.name + "\"";
+    if (!item.filename.empty()) {
+      body += "; filename=\"" + item.filename + "\"";
+    }
+    body += "\r\n";
+    if (!item.content_type.empty()) {
+      body += "Content-Type: " + item.content_type + "\r\n";
+    }
+    body += "\r\n";
+    body += item.content + "\r\n";
+  }
+
+  body += "--" + boundary + "--\r\n";
+
+  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) {
+  return Put(path, std::string(), nullptr);
+}
+
+inline std::shared_ptr<Response> Client::Put(const char *path,
+                                             const std::string &body,
+                                             const char *content_type) {
+  return Put(path, Headers(), body, content_type);
+}
+
+inline std::shared_ptr<Response> Client::Put(const char *path,
+                                             const Headers &headers,
+                                             const std::string &body,
+                                             const char *content_type) {
+  return send_with_content_provider("PUT", path, headers, body, 0, nullptr,
+                                    content_type);
+}
+
+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);
+}
+
+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);
+}
+
+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) {
+  auto query = detail::params_to_query_str(params);
+  return Put(path, headers, query, "application/x-www-form-urlencoded");
+}
+
+inline std::shared_ptr<Response> Client::Patch(const char *path,
+                                               const std::string &body,
+                                               const char *content_type) {
+  return Patch(path, Headers(), body, content_type);
+}
+
+inline std::shared_ptr<Response> Client::Patch(const char *path,
+                                               const Headers &headers,
+                                               const std::string &body,
+                                               const char *content_type) {
+  return send_with_content_provider("PATCH", path, headers, body, 0, nullptr,
+                                    content_type);
+}
+
+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);
+}
+
+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) {
+  return Delete(path, Headers(), std::string(), nullptr);
+}
+
+inline std::shared_ptr<Response> Client::Delete(const char *path,
+                                                const std::string &body,
+                                                const char *content_type) {
+  return Delete(path, Headers(), body, content_type);
+}
+
+inline std::shared_ptr<Response> Client::Delete(const char *path,
+                                                const Headers &headers) {
+  return Delete(path, headers, std::string(), nullptr);
+}
+
+inline std::shared_ptr<Response> Client::Delete(const char *path,
+                                                const Headers &headers,
+                                                const std::string &body,
+                                                const char *content_type) {
+  Request req;
+  req.method = "DELETE";
+  req.headers = headers;
+  req.path = path;
+
+  if (content_type) { req.headers.emplace("Content-Type", content_type); }
+  req.body = body;
+
+  auto res = std::make_shared<Response>();
+
+  return send(req, *res) ? res : nullptr;
+}
+
+inline std::shared_ptr<Response> Client::Options(const char *path) {
+  return Options(path, Headers());
+}
+
+inline std::shared_ptr<Response> Client::Options(const char *path,
+                                                 const Headers &headers) {
+  Request req;
+  req.method = "OPTIONS";
+  req.path = path;
+  req.headers = headers;
+
+  auto res = std::make_shared<Response>();
+
+  return send(req, *res) ? res : nullptr;
+}
+
+inline void Client::stop() {
+  if (sock_ != INVALID_SOCKET) {
+    std::atomic<socket_t> sock(sock_.exchange(INVALID_SOCKET));
+    detail::shutdown_socket(sock);
+    detail::close_socket(sock);
+  }
+}
+
+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::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
+ */
+#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
+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,
+    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;
+  {
+    std::lock_guard<std::mutex> guard(ctx_mutex);
+    ssl = SSL_new(ctx);
+  }
+
+  if (!ssl) {
+    close_socket(sock);
+    return false;
+  }
+
+  auto bio = BIO_new_socket(static_cast<int>(sock), BIO_NOCLOSE);
+  SSL_set_bio(ssl, bio, bio);
+
+  if (!setup(ssl)) {
+    SSL_shutdown(ssl);
+    {
+      std::lock_guard<std::mutex> guard(ctx_mutex);
+      SSL_free(ssl);
+    }
+
+    close_socket(sock);
+    return false;
+  }
+
+  auto ret = false;
+
+  if (SSL_connect_or_accept(ssl) == 1) {
+    if (keep_alive_max_count > 1) {
+      auto count = keep_alive_max_count;
+      while (count > 0 &&
+             (is_client_request ||
+              select_read(sock, CPPHTTPLIB_KEEPALIVE_TIMEOUT_SECOND,
+                          CPPHTTPLIB_KEEPALIVE_TIMEOUT_USECOND) > 0)) {
+        SSLSocketStream strm(sock, ssl, read_timeout_sec, read_timeout_usec);
+        auto last_connection = count == 1;
+        auto connection_close = false;
+
+        ret = callback(ssl, strm, last_connection, connection_close);
+        if (!ret || connection_close) { break; }
+
+        count--;
+      }
+    } else {
+      SSLSocketStream strm(sock, ssl, read_timeout_sec, read_timeout_usec);
+      auto dummy_connection_close = false;
+      ret = callback(ssl, strm, true, dummy_connection_close);
+    }
+  }
+
+  if (ret) {
+    SSL_shutdown(ssl); // shutdown only if not already closed by remote
+  }
+  {
+    std::lock_guard<std::mutex> guard(ctx_mutex);
+    SSL_free(ssl);
+  }
+
+  close_socket(sock);
+
+  return ret;
+}
+
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+static std::shared_ptr<std::vector<std::mutex>> openSSL_locks_;
+
+class SSLThreadLocks {
+public:
+  SSLThreadLocks() {
+    openSSL_locks_ =
+        std::make_shared<std::vector<std::mutex>>(CRYPTO_num_locks());
+    CRYPTO_set_locking_callback(locking_callback);
+  }
+
+  ~SSLThreadLocks() { CRYPTO_set_locking_callback(nullptr); }
+
+private:
+  static void locking_callback(int mode, int type, const char * /*file*/,
+                               int /*line*/) {
+    auto &lk = (*openSSL_locks_)[static_cast<size_t>(type)];
+    if (mode & CRYPTO_LOCK) {
+      lk.lock();
+    } else {
+      lk.unlock();
+    }
+  }
+};
+
+#endif
+
+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() {
+#if OPENSSL_VERSION_NUMBER < 0x1010001fL
+    ERR_free_strings();
+#endif
+  }
+
+private:
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+  SSLThreadLocks thread_init_;
+#endif
+};
+
+// SSL socket stream implementation
+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 ssize_t SSLSocketStream::read(char *ptr, size_t size) {
+  if (SSL_pending(ssl_) > 0 ||
+      select_read(sock_, read_timeout_sec_, read_timeout_usec_) > 0) {
+    return SSL_read(ssl_, ptr, static_cast<int>(size));
+  }
+  return -1;
+}
+
+inline ssize_t SSLSocketStream::write(const char *ptr, size_t size) {
+  if (is_writable()) { return SSL_write(ssl_, ptr, static_cast<int>(size)); }
+  return -1;
+}
+
+inline void SSLSocketStream::get_remote_ip_and_port(std::string &ip,
+                                                    int &port) const {
+  detail::get_remote_ip_and_port(sock_, ip, port);
+}
+
+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,
+                            const char *client_ca_cert_dir_path) {
+  ctx_ = SSL_CTX_new(SSLv23_server_method());
+
+  if (ctx_) {
+    SSL_CTX_set_options(ctx_,
+                        SSL_OP_ALL | SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 |
+                            SSL_OP_NO_COMPRESSION |
+                            SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION);
+
+    // auto ecdh = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
+    // SSL_CTX_set_tmp_ecdh(ctx_, ecdh);
+    // EC_KEY_free(ecdh);
+
+    if (SSL_CTX_use_certificate_chain_file(ctx_, cert_path) != 1 ||
+        SSL_CTX_use_PrivateKey_file(ctx_, private_key_path, SSL_FILETYPE_PEM) !=
+            1) {
+      SSL_CTX_free(ctx_);
+      ctx_ = nullptr;
+    } else if (client_ca_cert_file_path || client_ca_cert_dir_path) {
+      // if (client_ca_cert_file_path) {
+      //   auto list = SSL_load_client_CA_file(client_ca_cert_file_path);
+      //   SSL_CTX_set_client_CA_list(ctx_, list);
+      // }
+
+      SSL_CTX_load_verify_locations(ctx_, client_ca_cert_file_path,
+                                    client_ca_cert_dir_path);
+
+      SSL_CTX_set_verify(
+          ctx_,
+          SSL_VERIFY_PEER |
+              SSL_VERIFY_FAIL_IF_NO_PEER_CERT, // SSL_VERIFY_CLIENT_ONCE,
+          nullptr);
+    }
+  }
+}
+
+inline SSLServer::SSLServer(X509 *cert, EVP_PKEY *private_key,
+                            X509_STORE *client_ca_cert_store) {
+  ctx_ = SSL_CTX_new(SSLv23_server_method());
+
+  if (ctx_) {
+    SSL_CTX_set_options(ctx_,
+                        SSL_OP_ALL | SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 |
+                            SSL_OP_NO_COMPRESSION |
+                            SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION);
+
+    if (SSL_CTX_use_certificate(ctx_, cert) != 1 ||
+        SSL_CTX_use_PrivateKey(ctx_, private_key) != 1) {
+      SSL_CTX_free(ctx_);
+      ctx_ = nullptr;
+    } else if (client_ca_cert_store) {
+
+      SSL_CTX_set_cert_store(ctx_, client_ca_cert_store);
+
+      SSL_CTX_set_verify(
+          ctx_,
+          SSL_VERIFY_PEER |
+              SSL_VERIFY_FAIL_IF_NO_PEER_CERT, // SSL_VERIFY_CLIENT_ONCE,
+          nullptr);
+    }
+  }
+}
+
+inline SSLServer::~SSLServer() {
+  if (ctx_) { SSL_CTX_free(ctx_); }
+}
+
+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_, 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,
+                               [&](Request &req) { req.ssl = ssl; });
+      });
+}
+
+// SSL HTTP client implementation
+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.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.c_str(),
+                                    SSL_FILETYPE_PEM) != 1) {
+      SSL_CTX_free(ctx_);
+      ctx_ = nullptr;
+    }
+  }
+}
+
+inline SSLClient::SSLClient(const std::string &host, int port,
+                            X509 *client_cert, EVP_PKEY *client_key)
+    : Client(host, port) {
+  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 != nullptr && client_key != nullptr) {
+    if (SSL_CTX_use_certificate(ctx_, client_cert) != 1 ||
+        SSL_CTX_use_PrivateKey(ctx_, client_key) != 1) {
+      SSL_CTX_free(ctx_);
+      ctx_ = nullptr;
+    }
+  }
+}
+
+inline SSLClient::~SSLClient() {
+  if (ctx_) { SSL_CTX_free(ctx_); }
+}
+
+inline bool SSLClient::is_valid() const { return ctx_; }
+
+inline void SSLClient::set_ca_cert_path(const char *ca_cert_file_path,
+                                        const char *ca_cert_dir_path) {
+  if (ca_cert_file_path) { ca_cert_file_path_ = ca_cert_file_path; }
+  if (ca_cert_dir_path) { ca_cert_dir_path_ = ca_cert_dir_path; }
+}
+
+inline void SSLClient::set_ca_cert_store(X509_STORE *ca_cert_store) {
+  if (ca_cert_store) { ca_cert_store_ = ca_cert_store; }
+}
+
+inline void SSLClient::enable_server_certificate_verification(bool enabled) {
+  server_certificate_verification_ = enabled;
+}
+
+inline long SSLClient::get_openssl_verify_result() const {
+  return verify_result_;
+}
+
+inline SSL_CTX *SSLClient::ssl_context() const { return ctx_; }
+
+inline bool SSLClient::process_and_close_socket(
+    socket_t sock, size_t request_count,
+    std::function<bool(Stream &strm, bool last_connection,
+                       bool &connection_close)>
+        callback) {
+
+  request_count = std::min(request_count, keep_alive_max_count_);
+
+  return is_valid() &&
+         detail::process_and_close_socket_ssl(
+             true, sock, request_count, read_timeout_sec_, read_timeout_usec_,
+             ctx_, ctx_mutex_,
+             [&](SSL *ssl) {
+               if (ca_cert_file_path_.empty() && ca_cert_store_ == nullptr) {
+                 SSL_CTX_set_verify(ctx_, SSL_VERIFY_NONE, nullptr);
+               } else if (!ca_cert_file_path_.empty()) {
+                 if (!SSL_CTX_load_verify_locations(
+                         ctx_, ca_cert_file_path_.c_str(), nullptr)) {
+                   return false;
+                 }
+                 SSL_CTX_set_verify(ctx_, SSL_VERIFY_PEER, nullptr);
+               } else if (ca_cert_store_ != nullptr) {
+                 if (SSL_CTX_get_cert_store(ctx_) != ca_cert_store_) {
+                   SSL_CTX_set_cert_store(ctx_, ca_cert_store_);
+                 }
+                 SSL_CTX_set_verify(ctx_, SSL_VERIFY_PEER, nullptr);
+               }
+
+               if (SSL_connect(ssl) != 1) { return false; }
+
+               if (server_certificate_verification_) {
+                 verify_result_ = SSL_get_verify_result(ssl);
+
+                 if (verify_result_ != X509_V_OK) { return false; }
+
+                 auto server_cert = SSL_get_peer_certificate(ssl);
+
+                 if (server_cert == nullptr) { return false; }
+
+                 if (!verify_host(server_cert)) {
+                   X509_free(server_cert);
+                   return false;
+                 }
+                 X509_free(server_cert);
+               }
+
+               return true;
+             },
+             [&](SSL *ssl) {
+               SSL_set_tlsext_host_name(ssl, host_.c_str());
+               return true;
+             },
+             [&](SSL * /*ssl*/, Stream &strm, bool last_connection,
+                 bool &connection_close) {
+               return callback(strm, last_connection, connection_close);
+             });
+}
+
+inline bool SSLClient::is_ssl() const { return true; }
+
+inline bool SSLClient::verify_host(X509 *server_cert) const {
+  /* Quote from RFC2818 section 3.1 "Server Identity"
+
+     If a subjectAltName extension of type dNSName is present, that MUST
+     be used as the identity. Otherwise, the (most specific) Common Name
+     field in the Subject field of the certificate MUST be used. Although
+     the use of the Common Name is existing practice, it is deprecated and
+     Certification Authorities are encouraged to use the dNSName instead.
+
+     Matching is performed using the matching rules specified by
+     [RFC2459].  If more than one identity of a given type is present in
+     the certificate (e.g., more than one dNSName name, a match in any one
+     of the set is considered acceptable.) Names may contain the wildcard
+     character * which is considered to match any single domain name
+     component or component fragment. E.g., *.a.com matches foo.a.com but
+     not bar.foo.a.com. f*.com matches foo.com but not bar.com.
+
+     In some cases, the URI is specified as an IP address rather than a
+     hostname. In this case, the iPAddress subjectAltName must be present
+     in the certificate and must exactly match the IP in the URI.
+
+  */
+  return verify_host_with_subject_alt_name(server_cert) ||
+         verify_host_with_common_name(server_cert);
+}
+
+inline bool
+SSLClient::verify_host_with_subject_alt_name(X509 *server_cert) const {
+  auto ret = false;
+
+  auto type = GEN_DNS;
+
+  struct in6_addr addr6;
+  struct in_addr addr;
+  size_t addr_len = 0;
+
+#ifndef __MINGW32__
+  if (inet_pton(AF_INET6, host_.c_str(), &addr6)) {
+    type = GEN_IPADD;
+    addr_len = sizeof(struct in6_addr);
+  } else if (inet_pton(AF_INET, host_.c_str(), &addr)) {
+    type = GEN_IPADD;
+    addr_len = sizeof(struct in_addr);
+  }
+#endif
+
+  auto alt_names = static_cast<const struct stack_st_GENERAL_NAME *>(
+      X509_get_ext_d2i(server_cert, NID_subject_alt_name, nullptr, nullptr));
+
+  if (alt_names) {
+    auto dsn_matched = false;
+    auto ip_mached = false;
+
+    auto count = sk_GENERAL_NAME_num(alt_names);
+
+    for (auto i = 0; i < count && !dsn_matched; i++) {
+      auto val = sk_GENERAL_NAME_value(alt_names, i);
+      if (val->type == type) {
+        auto name = (const char *)ASN1_STRING_get0_data(val->d.ia5);
+        auto name_len = (size_t)ASN1_STRING_length(val->d.ia5);
+
+        if (strlen(name) == name_len) {
+          switch (type) {
+          case GEN_DNS: dsn_matched = check_host_name(name, name_len); break;
+
+          case GEN_IPADD:
+            if (!memcmp(&addr6, name, addr_len) ||
+                !memcmp(&addr, name, addr_len)) {
+              ip_mached = true;
+            }
+            break;
+          }
+        }
+      }
+    }
+
+    if (dsn_matched || ip_mached) { ret = true; }
+  }
+
+  GENERAL_NAMES_free((STACK_OF(GENERAL_NAME) *)alt_names);
+
+  return ret;
+}
+
+inline bool SSLClient::verify_host_with_common_name(X509 *server_cert) const {
+  const auto subject_name = X509_get_subject_name(server_cert);
+
+  if (subject_name != nullptr) {
+    char name[BUFSIZ];
+    auto name_len = X509_NAME_get_text_by_NID(subject_name, NID_commonName,
+                                              name, sizeof(name));
+
+    if (name_len != -1) {
+      return check_host_name(name, static_cast<size_t>(name_len));
+    }
+  }
+
+  return false;
+}
+
+inline bool SSLClient::check_host_name(const char *pattern,
+                                       size_t pattern_len) const {
+  if (host_.size() == pattern_len && host_ == pattern) { return true; }
+
+  // Wildcard match
+  // https://bugs.launchpad.net/ubuntu/+source/firefox-3.0/+bug/376484
+  std::vector<std::string> pattern_components;
+  detail::split(&pattern[0], &pattern[pattern_len], '.',
+                [&](const char *b, const char *e) {
+                  pattern_components.emplace_back(std::string(b, e));
+                });
+
+  if (host_components_.size() != pattern_components.size()) { return false; }
+
+  auto itr = pattern_components.begin();
+  for (const auto &h : host_components_) {
+    auto &p = *itr;
+    if (p != h && p != "*") {
+      auto partial_match = (p.size() > 0 && p[p.size() - 1] == '*' &&
+                            !p.compare(0, p.size() - 1, h));
+      if (!partial_match) { return false; }
+    }
+    ++itr;
+  }
+
+  return true;
+}
+#endif
+
+namespace url {
+
+struct Options {
+  // TODO: support more options...
+  bool follow_location = false;
+  std::string client_cert_path;
+  std::string client_key_path;
+
+  std::string ca_cert_file_path;
+  std::string ca_cert_dir_path;
+  bool server_certificate_verification = false;
+};
+
+inline std::shared_ptr<Response> Get(const char *url, Options &options) {
+  const static std::regex re(
+      R"(^(https?)://([^:/?#]+)(?::(\d+))?([^?#]*(?:\?[^#]*)?)(?:#.*)?)");
+
+  std::cmatch m;
+  if (!std::regex_match(url, m, re)) { return nullptr; }
+
+  auto next_scheme = m[1].str();
+  auto next_host = m[2].str();
+  auto port_str = m[3].str();
+  auto next_path = m[4].str();
+
+  auto next_port = !port_str.empty() ? std::stoi(port_str)
+                                     : (next_scheme == "https" ? 443 : 80);
+
+  if (next_path.empty()) { next_path = "/"; }
+
+  if (next_scheme == "https") {
+#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
+    SSLClient cli(next_host.c_str(), next_port, options.client_cert_path,
+                  options.client_key_path);
+    cli.set_follow_location(options.follow_location);
+    cli.set_ca_cert_path(options.ca_cert_file_path.c_str(),
+                         options.ca_cert_dir_path.c_str());
+    cli.enable_server_certificate_verification(
+        options.server_certificate_verification);
+    return cli.Get(next_path.c_str());
+#else
+    return nullptr;
+#endif
+  } else {
+    Client cli(next_host.c_str(), next_port, options.client_cert_path,
+               options.client_key_path);
+    cli.set_follow_location(options.follow_location);
+    return cli.Get(next_path.c_str());
+  }
+}
+
+inline std::shared_ptr<Response> Get(const char *url) {
+  Options options;
+  return Get(url, options);
+}
+
+} // namespace url
+
+namespace detail {
+
+#undef HANDLE_EINTR
+
+} // namespace detail
+
+// ----------------------------------------------------------------------------
+
+} // namespace httplib
+
+#endif // CPPHTTPLIB_HTTPLIB_H
+