Release v0.12.0

* Add test/CMakeLists.txt to enable testing with CTest

Add HTTPLIB_TEST option
Downlaod GoogleTest source using FetchContent module
Generate cert files to test httplib with OpenSSL

* Generate cert2.pem with a new certificate request

* Use the latest GoogleTest library

CMakeLists.txt

@@ -8,6 +8,7 @@
 	* HTTPLIB_USE_BROTLI_IF_AVAILABLE (default on)
 	* HTTPLIB_REQUIRE_BROTLI (default off)
 	* HTTPLIB_COMPILE (default off)
+	* HTTPLIB_TEST (default off)
 	* BROTLI_USE_STATIC_LIBS - tells Cmake to use the static Brotli libs (only works if you have them installed).
 	* OPENSSL_USE_STATIC_LIBS - tells Cmake to use the static OpenSSL libs (only works if you have them installed).
 
@@ -88,7 +89,7 @@ option(HTTPLIB_COMPILE "If ON, uses a Python script to split the header into a c
 if(HTTPLIB_COMPILE)
 	set(HTTPLIB_IS_COMPILED TRUE)
 endif()
-
+option(HTTPLIB_TEST "Enables testing and builds tests" OFF)
 option(HTTPLIB_REQUIRE_BROTLI "Requires Brotli to be found & linked, or fails build." OFF)
 option(HTTPLIB_USE_BROTLI_IF_AVAILABLE "Uses Brotli (if available) to enable Brotli decompression support." ON)
 # Defaults to static library
@@ -176,7 +177,7 @@ if(HTTPLIB_COMPILE)
 	set_target_properties(${PROJECT_NAME}
 		PROPERTIES
 			VERSION ${${PROJECT_NAME}_VERSION}
-			SOVERSION ${${PROJECT_NAME}_VERSION_MAJOR}
+			SOVERSION "${${PROJECT_NAME}_VERSION_MAJOR}.${${PROJECT_NAME}_VERSION_MINOR}"
 	)
 else()
 	# This is for header-only.
@@ -193,7 +194,7 @@ target_compile_features(${PROJECT_NAME} ${_INTERFACE_OR_PUBLIC}
 	cxx_std_11
 )
 
-target_include_directories(${PROJECT_NAME} ${_INTERFACE_OR_PUBLIC}
+target_include_directories(${PROJECT_NAME} SYSTEM ${_INTERFACE_OR_PUBLIC}
     $<BUILD_INTERFACE:${_httplib_build_includedir}>
     $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
 )
@@ -221,15 +222,8 @@ target_compile_definitions(${PROJECT_NAME} ${_INTERFACE_OR_PUBLIC}
 	$<$<BOOL:${HTTPLIB_IS_USING_OPENSSL}>:CPPHTTPLIB_OPENSSL_SUPPORT>
 )
 
-# Cmake's find_package search path is different based on the system
-# See https://cmake.org/cmake/help/latest/command/find_package.html for the list
-if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
-	set(_TARGET_INSTALL_CMAKEDIR "${CMAKE_INSTALL_PREFIX}/cmake/${PROJECT_NAME}")
-else()
-	# On Non-Windows, it should be /usr/lib/cmake/<name>/<name>Config.cmake
-	# NOTE: This may or may not work for macOS...
-	set(_TARGET_INSTALL_CMAKEDIR "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}")
-endif()
+# CMake configuration files installation directory
+set(_TARGET_INSTALL_CMAKEDIR "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}")
 
 include(CMakePackageConfigHelpers)
 
@@ -247,13 +241,13 @@ if(HTTPLIB_COMPILE)
 	write_basic_package_version_file("${PROJECT_NAME}ConfigVersion.cmake"
 		# Example: if you find_package(httplib 0.5.4)
 		# then anything >= 0.5 and <= 1.0 is accepted
-		COMPATIBILITY SameMajorVersion
+		COMPATIBILITY SameMinorVersion
 	)
 else()
 	write_basic_package_version_file("${PROJECT_NAME}ConfigVersion.cmake"
 		# Example: if you find_package(httplib 0.5.4)
 		# then anything >= 0.5 and <= 1.0 is accepted
-		COMPATIBILITY SameMajorVersion
+		COMPATIBILITY SameMinorVersion
 		# Tells Cmake that it's a header-only lib
 		# Mildly useful for end-users :)
 		ARCH_INDEPENDENT
@@ -285,3 +279,8 @@ install(EXPORT httplibTargets
 	NAMESPACE ${PROJECT_NAME}::
 	DESTINATION ${_TARGET_INSTALL_CMAKEDIR}
 )
+
+if(HTTPLIB_TEST)
+    include(CTest)
+    add_subdirectory(test)
+endif()

README.md

@@ -7,12 +7,12 @@ A C++11 single-file header-only cross platform HTTP/HTTPS library.
 
 It's extremely easy to setup. Just include the **httplib.h** file in your code!
 
-NOTE: This is a multi-threaded 'blocking' HTTP library. If you are looking for a 'non-blocking' library, this is not the one that you want.
+NOTE: This library uses 'blocking' socket I/O. If you are looking for a library with 'non-blocking' socket I/O, this is not the one that you want.
 
 Simple examples
 ---------------
 
-#### Server
+#### Server (Multi-threaded)
 
 ```c++
 #define CPPHTTPLIB_OPENSSL_SUPPORT
@@ -65,6 +65,7 @@ httplib::SSLServer svr("./cert.pem", "./key.pem");
 // Client
 httplib::Client cli("https://localhost:1234"); // scheme + host
 httplib::SSLClient cli("localhost:1234"); // host
+httplib::SSLClient cli("localhost", 1234); // host, port
 
 // Use your CA bundle
 cli.set_ca_cert_path("./ca-bundle.crt");
@@ -492,6 +493,10 @@ auto res = cli.Get("/hi", headers);
 ```
 or
 ```c++
+auto res = cli.Get("/hi", {{"Accept-Encoding", "gzip, deflate"}});
+```
+or
+```c++
 cli.set_default_headers({
   { "Accept-Encoding", "gzip, deflate" }
 });

example/ssesvr.cc

@@ -19,7 +19,7 @@ public:
     unique_lock<mutex> lk(m_);
     int id = id_;
     cv_.wait(lk, [&] { return cid_ == id; });
-    if (sink->is_writable()) { sink->write(message_.data(), message_.size()); }
+    sink->write(message_.data(), message_.size());
   }
 
   void send_event(const string &message) {

example/uploader.sh

@@ -1,5 +1,5 @@
 #/usr/bin/env bash
-for i in {1..10000}
+for i in {1..1000000}
 do
   echo "#### $i ####"
   curl -X POST -F image_file=@$1 http://localhost:1234/post > /dev/null

meson.build

@@ -77,6 +77,7 @@ if get_option('cpp-httplib_compile')
     dependencies: deps,
     cpp_args: args,
     version: version,
+    soversion: version.split('.')[0] + '.' + version.split('.')[1],
     install: true
   )
   cpp_httplib_dep = declare_dependency(compile_args: args, dependencies: deps, link_with: lib, sources: httplib_ch[1])

test/CMakeLists.txt

@@ -0,0 +1,93 @@
+cmake_policy(SET CMP0135 NEW)
+
+include(FetchContent)
+include(GoogleTest)
+
+set(BUILD_GMOCK OFF)
+set(INSTALL_GTEST OFF)
+set(gtest_force_shared_crt ON)
+
+FetchContent_Declare(
+    gtest
+    URL https://github.com/google/googletest/archive/main.tar.gz
+)
+FetchContent_MakeAvailable(gtest)
+
+add_executable(httplib-test test.cc)
+target_compile_options(httplib-test PRIVATE "$<$<CXX_COMPILER_ID:MSVC>:/utf-8>")
+target_link_libraries(httplib-test PRIVATE httplib GTest::gtest_main)
+gtest_discover_tests(httplib-test)
+
+execute_process(
+    COMMAND ${CMAKE_COMMAND} -E copy_directory ${CMAKE_CURRENT_LIST_DIR}/www www
+    COMMAND ${CMAKE_COMMAND} -E copy_directory ${CMAKE_CURRENT_LIST_DIR}/www2 www2
+    COMMAND ${CMAKE_COMMAND} -E copy_directory ${CMAKE_CURRENT_LIST_DIR}/www3 www3
+    COMMAND ${CMAKE_COMMAND} -E copy_if_different ${CMAKE_CURRENT_LIST_DIR}/ca-bundle.crt ca-bundle.crt
+    COMMAND ${CMAKE_COMMAND} -E copy_if_different ${CMAKE_CURRENT_LIST_DIR}/image.jpg image.jpg
+    WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+    COMMAND_ERROR_IS_FATAL ANY
+)
+
+if(HTTPLIB_IS_USING_OPENSSL)
+    find_program(OPENSSL_COMMAND
+        NAMES openssl
+        PATHS ${OPENSSL_INCLUDE_DIR}/../bin
+        REQUIRED
+    )
+    execute_process(
+        COMMAND ${OPENSSL_COMMAND} genrsa 2048
+        OUTPUT_FILE key.pem
+        WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+        COMMAND_ERROR_IS_FATAL ANY
+    )
+    execute_process(
+        COMMAND ${OPENSSL_COMMAND} req -new -batch -config ${CMAKE_CURRENT_LIST_DIR}/test.conf -key key.pem
+        COMMAND ${OPENSSL_COMMAND} x509 -days 3650 -req -signkey key.pem
+        OUTPUT_FILE cert.pem
+        WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+        COMMAND_ERROR_IS_FATAL ANY
+    )
+    execute_process(
+        COMMAND ${OPENSSL_COMMAND} req -x509 -new -config ${CMAKE_CURRENT_LIST_DIR}/test.conf -key key.pem -sha256 -days 3650 -nodes -out cert2.pem -extensions SAN
+        WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+        COMMAND_ERROR_IS_FATAL ANY
+    )
+    execute_process(
+        COMMAND ${OPENSSL_COMMAND} genrsa 2048
+        OUTPUT_FILE rootCA.key.pem
+        WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+        COMMAND_ERROR_IS_FATAL ANY
+    )
+    execute_process(
+        COMMAND ${OPENSSL_COMMAND} req -x509 -new -batch -config ${CMAKE_CURRENT_LIST_DIR}/test.rootCA.conf -key rootCA.key.pem -days 1024
+        OUTPUT_FILE rootCA.cert.pem
+        WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+        COMMAND_ERROR_IS_FATAL ANY
+    )
+    execute_process(
+        COMMAND ${OPENSSL_COMMAND} genrsa 2048
+        OUTPUT_FILE client.key.pem
+        WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+        COMMAND_ERROR_IS_FATAL ANY
+    )
+    execute_process(
+        COMMAND ${OPENSSL_COMMAND} req -new -batch -config ${CMAKE_CURRENT_LIST_DIR}/test.conf -key client.key.pem
+        COMMAND ${OPENSSL_COMMAND} x509 -days 370 -req -CA rootCA.cert.pem -CAkey rootCA.key.pem -CAcreateserial
+        OUTPUT_FILE client.cert.pem
+        WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+        COMMAND_ERROR_IS_FATAL ANY
+    )
+    execute_process(
+        COMMAND ${OPENSSL_COMMAND} genrsa -passout pass:test123! 2048
+        OUTPUT_FILE key_encrypted.pem
+        WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+        COMMAND_ERROR_IS_FATAL ANY
+    )
+    execute_process(
+        COMMAND ${OPENSSL_COMMAND} req -new -batch -config ${CMAKE_CURRENT_LIST_DIR}/test.conf -key key_encrypted.pem
+        COMMAND ${OPENSSL_COMMAND} x509 -days 3650 -req -signkey key_encrypted.pem
+        OUTPUT_FILE cert_encrypted.pem
+        WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+        COMMAND_ERROR_IS_FATAL ANY
+    )
+endif()

test/fuzzing/server_fuzzer.cc

@@ -22,8 +22,6 @@ public:
 
   ssize_t write(const std::string &s) { return write(s.data(), s.size()); }
 
-  std::string get_remote_addr() const { return ""; }
-
   bool is_readable() const override { return true; }
 
   bool is_writable() const override { return true; }
@@ -33,6 +31,11 @@ public:
     port = 8080;
   }
 
+  void get_local_ip_and_port(std::string &ip, int &port) const override {
+    ip = "127.0.0.1";
+    port = 8080;
+  }
+
   socket_t socket() const override { return 0; }
 
 private:

test/test.cc

@@ -1,10 +1,12 @@
 #include <httplib.h>
+#include <signal.h>
 
 #include <gtest/gtest.h>
 
 #include <atomic>
 #include <chrono>
 #include <future>
+#include <memory>
 #include <sstream>
 #include <stdexcept>
 #include <thread>
@@ -594,7 +596,7 @@ TEST(ConnectionErrorTest, InvalidHostCheckResultErrorToString) {
   ASSERT_TRUE(!res);
   stringstream s;
   s << "error code: " << res.error();
-  EXPECT_EQ("error code: Connection (2)", s.str());
+  EXPECT_EQ("error code: Could not establish connection (2)", s.str());
 }
 
 TEST(ConnectionErrorTest, InvalidPort) {
@@ -942,6 +944,44 @@ TEST(UrlWithSpace, Redirect_Online) {
 
 #endif
 
+#if !defined(_WIN32) && !defined(_WIN64)
+TEST(ReceiveSignals, Signal) {
+  auto setupSignalHandlers = []() {
+    struct sigaction act;
+
+    sigemptyset(&act.sa_mask);
+    act.sa_flags = SA_SIGINFO;
+    act.sa_sigaction = [](int sig, siginfo_t *, void *) {
+      switch (sig) {
+      case SIGINT:
+      default: break;
+      }
+    };
+    ::sigaction(SIGINT, &act, nullptr);
+  };
+
+  Server svr;
+  int port = 0;
+  auto thread = std::thread([&]() {
+    setupSignalHandlers();
+    port = svr.bind_to_any_port("localhost");
+    svr.listen_after_bind();
+  });
+
+  while (!svr.is_running()) {
+    std::this_thread::sleep_for(std::chrono::milliseconds(1));
+  }
+
+  ASSERT_TRUE(svr.is_running());
+  pthread_kill(thread.native_handle(), SIGINT);
+  std::this_thread::sleep_for(std::chrono::milliseconds(100));
+  ASSERT_TRUE(svr.is_running());
+  svr.stop();
+  thread.join();
+  ASSERT_FALSE(svr.is_running());
+}
+#endif
+
 TEST(RedirectToDifferentPort, Redirect) {
   Server svr1;
   svr1.Get("/1", [&](const Request & /*req*/, Response &res) {
@@ -1324,7 +1364,12 @@ TEST(NoContentTest, ContentLength) {
 }
 
 TEST(RoutingHandlerTest, PreRoutingHandler) {
+#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
+  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
+  ASSERT_TRUE(svr.is_valid());
+#else
   Server svr;
+#endif
 
   svr.set_pre_routing_handler([](const Request &req, Response &res) {
     if (req.path == "/routing_handler") {
@@ -1355,7 +1400,12 @@ TEST(RoutingHandlerTest, PreRoutingHandler) {
   std::this_thread::sleep_for(std::chrono::seconds(1));
 
   {
+#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
+    SSLClient cli(HOST, PORT);
+    cli.enable_server_certificate_verification(false);
+#else
     Client cli(HOST, PORT);
+#endif
 
     auto res = cli.Get("/routing_handler");
     ASSERT_TRUE(res);
@@ -1368,7 +1418,12 @@ TEST(RoutingHandlerTest, PreRoutingHandler) {
   }
 
   {
+#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
+    SSLClient cli(HOST, PORT);
+    cli.enable_server_certificate_verification(false);
+#else
     Client cli(HOST, PORT);
+#endif
 
     auto res = cli.Get("/hi");
     ASSERT_TRUE(res);
@@ -1379,7 +1434,12 @@ TEST(RoutingHandlerTest, PreRoutingHandler) {
   }
 
   {
+#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
+    SSLClient cli(HOST, PORT);
+    cli.enable_server_certificate_verification(false);
+#else
     Client cli(HOST, PORT);
+#endif
 
     auto res = cli.Get("/aaa");
     ASSERT_TRUE(res);
@@ -1521,6 +1581,17 @@ protected:
                          std::stoi(req.get_header_value("REMOTE_PORT")));
                res.set_content(remote_addr.c_str(), "text/plain");
              })
+        .Get("/local_addr",
+             [&](const Request &req, Response &res) {
+               EXPECT_TRUE(req.has_header("LOCAL_PORT"));
+               EXPECT_TRUE(req.has_header("LOCAL_ADDR"));
+               auto local_addr = req.get_header_value("LOCAL_ADDR");
+               auto local_port = req.get_header_value("LOCAL_PORT");
+               EXPECT_EQ(req.local_addr, local_addr);
+               EXPECT_EQ(req.local_port, std::stoi(local_port));
+               res.set_content(local_addr.append(":").append(local_port),
+                               "text/plain");
+             })
         .Get("/endwith%",
              [&](const Request & /*req*/, Response &res) {
                res.set_content("Hello World!", "text/plain");
@@ -1579,7 +1650,6 @@ protected:
              [&](const Request & /*req*/, Response &res) {
                res.set_chunked_content_provider(
                    "text/plain", [](size_t /*offset*/, DataSink &sink) {
-                     EXPECT_TRUE(sink.is_writable());
                      sink.os << "123";
                      sink.os << "456";
                      sink.os << "789";
@@ -1593,7 +1663,6 @@ protected:
                res.set_chunked_content_provider(
                    "text/plain",
                    [i](size_t /*offset*/, DataSink &sink) {
-                     EXPECT_TRUE(sink.is_writable());
                      switch (*i) {
                      case 0: sink.os << "123"; break;
                      case 1: sink.os << "456"; break;
@@ -1623,7 +1692,6 @@ protected:
                res.set_content_provider(
                    data->size(), "text/plain",
                    [data](size_t offset, size_t length, DataSink &sink) {
-                     EXPECT_TRUE(sink.is_writable());
                      size_t DATA_CHUNK_SIZE = 4;
                      const auto &d = *data;
                      auto out_len =
@@ -1643,7 +1711,6 @@ protected:
                res.set_content_provider(
                    size_t(-1), "text/plain",
                    [](size_t /*offset*/, size_t /*length*/, DataSink &sink) {
-                     EXPECT_TRUE(sink.is_writable());
                      sink.os << "data_chunk";
                      return true;
                    });
@@ -1714,6 +1781,22 @@ protected:
                 EXPECT_EQ("0", req.get_header_value("Content-Length"));
                 res.set_content("empty-no-content-type", "text/plain");
               })
+        .Post("/path-only",
+              [&](const Request &req, Response &res) {
+                EXPECT_EQ(req.body, "");
+                EXPECT_EQ("", req.get_header_value("Content-Type"));
+                EXPECT_EQ("0", req.get_header_value("Content-Length"));
+                res.set_content("path-only", "text/plain");
+              })
+        .Post("/path-headers-only",
+              [&](const Request &req, Response &res) {
+                EXPECT_EQ(req.body, "");
+                EXPECT_EQ("", req.get_header_value("Content-Type"));
+                EXPECT_EQ("0", req.get_header_value("Content-Length"));
+                EXPECT_EQ("world", req.get_header_value("hello"));
+                EXPECT_EQ("world2", req.get_header_value("hello2"));
+                res.set_content("path-headers-only", "text/plain");
+              })
         .Post("/post-large",
               [&](const Request &req, Response &res) {
                 EXPECT_EQ(req.body, LARGE_DATA);
@@ -2124,6 +2207,21 @@ TEST_F(ServerTest, PostEmptyContentWithNoContentType) {
   ASSERT_EQ("empty-no-content-type", res->body);
 }
 
+TEST_F(ServerTest, PostPathOnly) {
+  auto res = cli_.Post("/path-only");
+  ASSERT_TRUE(res);
+  ASSERT_EQ(200, res->status);
+  ASSERT_EQ("path-only", res->body);
+}
+
+TEST_F(ServerTest, PostPathAndHeadersOnly) {
+  auto res = cli_.Post("/path-headers-only",
+                       Headers({{"hello", "world"}, {"hello2", "world2"}}));
+  ASSERT_TRUE(res);
+  ASSERT_EQ(200, res->status);
+  ASSERT_EQ("path-headers-only", res->body);
+}
+
 TEST_F(ServerTest, PostLarge) {
   auto res = cli_.Post("/post-large", LARGE_DATA, "text/plain");
   ASSERT_TRUE(res);
@@ -2778,6 +2876,15 @@ TEST_F(ServerTest, GetMethodRemoteAddr) {
   EXPECT_TRUE(res->body == "::1" || res->body == "127.0.0.1");
 }
 
+TEST_F(ServerTest, GetMethodLocalAddr) {
+  auto res = cli_.Get("/local_addr");
+  ASSERT_TRUE(res);
+  EXPECT_EQ(200, res->status);
+  EXPECT_EQ("text/plain", res->get_header_value("Content-Type"));
+  EXPECT_TRUE(res->body == std::string("::1:").append(to_string(PORT)) ||
+              res->body == std::string("127.0.0.1:").append(to_string(PORT)));
+}
+
 TEST_F(ServerTest, HTTPResponseSplitting) {
   auto res = cli_.Get("/http_response_splitting");
   ASSERT_TRUE(res);
@@ -2840,7 +2947,6 @@ TEST_F(ServerTest, PutWithContentProvider) {
   auto res = cli_.Put(
       "/put", 3,
       [](size_t /*offset*/, size_t /*length*/, DataSink &sink) {
-        EXPECT_TRUE(sink.is_writable());
         sink.os << "PUT";
         return true;
       },
@@ -2867,7 +2973,6 @@ TEST_F(ServerTest, PutWithContentProviderWithoutLength) {
   auto res = cli_.Put(
       "/put",
       [](size_t /*offset*/, DataSink &sink) {
-        EXPECT_TRUE(sink.is_writable());
         sink.os << "PUT";
         sink.done();
         return true;
@@ -2894,7 +2999,6 @@ TEST_F(ServerTest, PutWithContentProviderWithGzip) {
   auto res = cli_.Put(
       "/put", 3,
       [](size_t /*offset*/, size_t /*length*/, DataSink &sink) {
-        EXPECT_TRUE(sink.is_writable());
         sink.os << "PUT";
         return true;
       },
@@ -2923,7 +3027,6 @@ TEST_F(ServerTest, PutWithContentProviderWithoutLengthWithGzip) {
   auto res = cli_.Put(
       "/put",
       [](size_t /*offset*/, DataSink &sink) {
-        EXPECT_TRUE(sink.is_writable());
         sink.os << "PUT";
         sink.done();
         return true;
@@ -3807,9 +3910,12 @@ TEST(MountTest, Unmount) {
 TEST(ExceptionTest, ThrowExceptionInHandler) {
   Server svr;
 
-  svr.Get("/hi", [&](const Request & /*req*/, Response & /*res*/) {
+  svr.Get("/exception", [&](const Request & /*req*/, Response & /*res*/) {
     throw std::runtime_error("exception...");
-    // res.set_content("Hello World!", "text/plain");
+  });
+
+  svr.Get("/unknown", [&](const Request & /*req*/, Response & /*res*/) {
+    throw std::runtime_error("exception\r\n...");
   });
 
   auto listen_thread = std::thread([&svr]() { svr.listen("localhost", PORT); });
@@ -3822,11 +3928,21 @@ TEST(ExceptionTest, ThrowExceptionInHandler) {
 
   Client cli("localhost", PORT);
 
-  auto res = cli.Get("/hi");
-  ASSERT_TRUE(res);
-  EXPECT_EQ(500, res->status);
-  ASSERT_TRUE(res->has_header("EXCEPTION_WHAT"));
-  EXPECT_EQ("exception...", res->get_header_value("EXCEPTION_WHAT"));
+  {
+    auto res = cli.Get("/exception");
+    ASSERT_TRUE(res);
+    EXPECT_EQ(500, res->status);
+    ASSERT_TRUE(res->has_header("EXCEPTION_WHAT"));
+    EXPECT_EQ("exception...", res->get_header_value("EXCEPTION_WHAT"));
+  }
+
+  {
+    auto res = cli.Get("/unknown");
+    ASSERT_TRUE(res);
+    EXPECT_EQ(500, res->status);
+    ASSERT_TRUE(res->has_header("EXCEPTION_WHAT"));
+    EXPECT_EQ("exception\\r\\n...", res->get_header_value("EXCEPTION_WHAT"));
+  }
 
   svr.stop();
   listen_thread.join();
@@ -4180,7 +4296,8 @@ protected:
       res.set_content("Hello World!", "text/plain");
     });
 
-    t_ = thread([&]() { ASSERT_TRUE(svr_.listen(std::string(), PORT, AI_PASSIVE)); });
+    t_ = thread(
+        [&]() { ASSERT_TRUE(svr_.listen(std::string(), PORT, AI_PASSIVE)); });
 
     while (!svr_.is_running()) {
       std::this_thread::sleep_for(std::chrono::milliseconds(1));
@@ -4750,6 +4867,43 @@ TEST(SendAPI, SimpleInterface_Online) {
   EXPECT_EQ(301, res->status);
 }
 
+TEST(ClientImplMethods, GetSocketTest) {
+  httplib::Server svr;
+  svr.Get("/", [&](const httplib::Request & /*req*/, httplib::Response &res) {
+    res.status = 200;
+  });
+
+  auto thread = std::thread([&]() { svr.listen("127.0.0.1", 3333); });
+
+  while (!svr.is_running()) {
+    std::this_thread::sleep_for(std::chrono::milliseconds(5));
+  }
+
+  {
+    httplib::Client cli("http://127.0.0.1:3333");
+    cli.set_keep_alive(true);
+
+    // Use the behavior of cpp-httplib of opening the connection
+    // only when the first request happens. If that changes,
+    // this test would be obsolete.
+
+    EXPECT_EQ(cli.socket(), INVALID_SOCKET);
+
+    // This also implicitly tests the server. But other tests would fail much
+    // earlier than this one to be considered.
+
+    auto res = cli.Get("/");
+    ASSERT_TRUE(res);
+
+    EXPECT_EQ(200, res->status);
+    ASSERT_TRUE(cli.socket() != INVALID_SOCKET);
+  }
+
+  svr.stop();
+  thread.join();
+  ASSERT_FALSE(svr.is_running());
+}
+
 // Disabled due to out-of-memory problem on GitHub Actions
 #ifdef _WIN64
 TEST(ServerLargeContentTest, DISABLED_SendLargeContent) {
@@ -4983,6 +5137,247 @@ TEST(MultipartFormDataTest, LargeData) {
   t.join();
 }
 
+TEST(MultipartFormDataTest, DataProviderItems) {
+
+  std::random_device seed_gen;
+  std::mt19937 random(seed_gen());
+
+  std::string rand1;
+  rand1.resize(1000);
+  std::generate(rand1.begin(), rand1.end(), [&]() { return random(); });
+
+  std::string rand2;
+  rand2.resize(3000);
+  std::generate(rand2.begin(), rand2.end(), [&]() { return random(); });
+
+  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
+
+  svr.Post("/post-none", [&](const Request &req, Response & /*res*/,
+                             const ContentReader &content_reader) {
+    ASSERT_FALSE(req.is_multipart_form_data());
+
+    std::string body;
+    content_reader([&](const char *data, size_t data_length) {
+      body.append(data, data_length);
+      return true;
+    });
+
+    EXPECT_EQ(body, "");
+  });
+
+  svr.Post("/post-items", [&](const Request &req, Response & /*res*/,
+                              const ContentReader &content_reader) {
+    ASSERT_TRUE(req.is_multipart_form_data());
+    MultipartFormDataItems files;
+    content_reader(
+        [&](const MultipartFormData &file) {
+          files.push_back(file);
+          return true;
+        },
+        [&](const char *data, size_t data_length) {
+          files.back().content.append(data, data_length);
+          return true;
+        });
+
+    ASSERT_TRUE(files.size() == 2);
+
+    EXPECT_EQ(std::string(files[0].name), "name1");
+    EXPECT_EQ(files[0].content, "Testing123");
+    EXPECT_EQ(files[0].filename, "filename1");
+    EXPECT_EQ(files[0].content_type, "application/octet-stream");
+
+    EXPECT_EQ(files[1].name, "name2");
+    EXPECT_EQ(files[1].content, "Testing456");
+    EXPECT_EQ(files[1].filename, "");
+    EXPECT_EQ(files[1].content_type, "");
+  });
+
+  svr.Post("/post-providers", [&](const Request &req, Response & /*res*/,
+                                  const ContentReader &content_reader) {
+    ASSERT_TRUE(req.is_multipart_form_data());
+    MultipartFormDataItems files;
+    content_reader(
+        [&](const MultipartFormData &file) {
+          files.push_back(file);
+          return true;
+        },
+        [&](const char *data, size_t data_length) {
+          files.back().content.append(data, data_length);
+          return true;
+        });
+
+    ASSERT_TRUE(files.size() == 2);
+
+    EXPECT_EQ(files[0].name, "name3");
+    EXPECT_EQ(files[0].content, rand1);
+    EXPECT_EQ(files[0].filename, "filename3");
+    EXPECT_EQ(files[0].content_type, "");
+
+    EXPECT_EQ(files[1].name, "name4");
+    EXPECT_EQ(files[1].content, rand2);
+    EXPECT_EQ(files[1].filename, "filename4");
+    EXPECT_EQ(files[1].content_type, "");
+  });
+
+  svr.Post("/post-both", [&](const Request &req, Response & /*res*/,
+                             const ContentReader &content_reader) {
+    ASSERT_TRUE(req.is_multipart_form_data());
+    MultipartFormDataItems files;
+    content_reader(
+        [&](const MultipartFormData &file) {
+          files.push_back(file);
+          return true;
+        },
+        [&](const char *data, size_t data_length) {
+          files.back().content.append(data, data_length);
+          return true;
+        });
+
+    ASSERT_TRUE(files.size() == 4);
+
+    EXPECT_EQ(std::string(files[0].name), "name1");
+    EXPECT_EQ(files[0].content, "Testing123");
+    EXPECT_EQ(files[0].filename, "filename1");
+    EXPECT_EQ(files[0].content_type, "application/octet-stream");
+
+    EXPECT_EQ(files[1].name, "name2");
+    EXPECT_EQ(files[1].content, "Testing456");
+    EXPECT_EQ(files[1].filename, "");
+    EXPECT_EQ(files[1].content_type, "");
+
+    EXPECT_EQ(files[2].name, "name3");
+    EXPECT_EQ(files[2].content, rand1);
+    EXPECT_EQ(files[2].filename, "filename3");
+    EXPECT_EQ(files[2].content_type, "");
+
+    EXPECT_EQ(files[3].name, "name4");
+    EXPECT_EQ(files[3].content, rand2);
+    EXPECT_EQ(files[3].filename, "filename4");
+    EXPECT_EQ(files[3].content_type, "");
+  });
+
+  auto t = std::thread([&]() { svr.listen("localhost", 8080); });
+  while (!svr.is_running()) {
+    std::this_thread::sleep_for(std::chrono::milliseconds(1));
+  }
+  std::this_thread::sleep_for(std::chrono::seconds(1));
+
+  {
+    Client cli("https://localhost:8080");
+    cli.enable_server_certificate_verification(false);
+
+    MultipartFormDataItems items{
+        {"name1", "Testing123", "filename1", "application/octet-stream"},
+        {"name2", "Testing456", "", ""}, // not a file
+    };
+
+    {
+      auto res = cli.Post("/post-none", {}, {}, {});
+      ASSERT_TRUE(res);
+      ASSERT_EQ(200, res->status);
+    }
+
+    MultipartFormDataProviderItems providers;
+
+    {
+      auto res =
+          cli.Post("/post-items", {}, items, providers); // empty providers
+      ASSERT_TRUE(res);
+      ASSERT_EQ(200, res->status);
+    }
+
+    providers.push_back({"name3",
+                         [&](size_t offset, httplib::DataSink &sink) -> bool {
+                           // test the offset is given correctly at each step
+                           if (!offset)
+                             sink.os.write(rand1.data(), 30);
+                           else if (offset == 30)
+                             sink.os.write(rand1.data() + 30, 300);
+                           else if (offset == 330)
+                             sink.os.write(rand1.data() + 330, 670);
+                           else if (offset == rand1.size())
+                             sink.done();
+                           return true;
+                         },
+                         "filename3",
+                         {}});
+
+    providers.push_back({"name4",
+                         [&](size_t offset, httplib::DataSink &sink) -> bool {
+                           // test the offset is given correctly at each step
+                           if (!offset)
+                             sink.os.write(rand2.data(), 2000);
+                           else if (offset == 2000)
+                             sink.os.write(rand2.data() + 2000, 1);
+                           else if (offset == 2001)
+                             sink.os.write(rand2.data() + 2001, 999);
+                           else if (offset == rand2.size())
+                             sink.done();
+                           return true;
+                         },
+                         "filename4",
+                         {}});
+
+    {
+      auto res = cli.Post("/post-providers", {}, {}, providers);
+      ASSERT_TRUE(res);
+      ASSERT_EQ(200, res->status);
+    }
+
+    {
+      auto res = cli.Post("/post-both", {}, items, providers);
+      ASSERT_TRUE(res);
+      ASSERT_EQ(200, res->status);
+    }
+  }
+
+  svr.stop();
+  t.join();
+}
+
+TEST(MultipartFormDataTest, BadHeader) {
+  Server svr;
+  svr.Post("/post", [&](const Request & /*req*/, Response &res) {
+    res.set_content("ok", "text/plain");
+  });
+
+  thread t = thread([&] { svr.listen(HOST, PORT); });
+  while (!svr.is_running()) {
+    std::this_thread::sleep_for(std::chrono::milliseconds(1));
+  }
+
+  const std::string body =
+      "This is the preamble.  It is to be ignored, though it\r\n"
+      "is a handy place for composition agents to include an\r\n"
+      "explanatory note to non-MIME conformant readers.\r\n"
+      "\r\n"
+      "\r\n"
+      "--simple boundary\r\n"
+      "Content-Disposition: form-data; name=\"field1\"\r\n"
+      ": BAD...\r\n"
+      "\r\n"
+      "value1\r\n"
+      "--simple boundary\r\n"
+      "Content-Disposition: form-data; name=\"field2\"; "
+      "filename=\"example.txt\"\r\n"
+      "\r\n"
+      "value2\r\n"
+      "--simple boundary--\r\n"
+      "This is the epilogue.  It is also to be ignored.\r\n";
+
+  std::string content_type =
+      R"(multipart/form-data; boundary="simple boundary")";
+
+  Client cli(HOST, PORT);
+  auto res = cli.Post("/post", body, content_type.c_str());
+
+  ASSERT_TRUE(res);
+  EXPECT_EQ(400, res->status);
+
+  svr.stop();
+  t.join();
+}
+
 TEST(MultipartFormDataTest, WithPreamble) {
   Server svr;
   svr.Post("/post", [&](const Request & /*req*/, Response &res) {
@@ -5025,5 +5420,412 @@ TEST(MultipartFormDataTest, WithPreamble) {
   t.join();
 }
 
+TEST(MultipartFormDataTest, PostCustomBoundary) {
+  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
+
+  svr.Post("/post_customboundary", [&](const Request &req, Response & /*res*/,
+                                       const ContentReader &content_reader) {
+    if (req.is_multipart_form_data()) {
+      MultipartFormDataItems files;
+      content_reader(
+          [&](const MultipartFormData &file) {
+            files.push_back(file);
+            return true;
+          },
+          [&](const char *data, size_t data_length) {
+            files.back().content.append(data, data_length);
+            return true;
+          });
+
+      EXPECT_TRUE(std::string(files[0].name) == "document");
+      EXPECT_EQ(size_t(1024 * 1024 * 2), files[0].content.size());
+      EXPECT_TRUE(files[0].filename == "2MB_data");
+      EXPECT_TRUE(files[0].content_type == "application/octet-stream");
+
+      EXPECT_TRUE(files[1].name == "hello");
+      EXPECT_TRUE(files[1].content == "world");
+      EXPECT_TRUE(files[1].filename == "");
+      EXPECT_TRUE(files[1].content_type == "");
+    } else {
+      std::string body;
+      content_reader([&](const char *data, size_t data_length) {
+        body.append(data, data_length);
+        return true;
+      });
+    }
+  });
+
+  auto t = std::thread([&]() { svr.listen("localhost", 8080); });
+  while (!svr.is_running()) {
+    std::this_thread::sleep_for(std::chrono::milliseconds(1));
+  }
+  std::this_thread::sleep_for(std::chrono::seconds(1));
+
+  {
+    std::string data(1024 * 1024 * 2, '.');
+    std::stringstream buffer;
+    buffer << data;
+
+    Client cli("https://localhost:8080");
+    cli.enable_server_certificate_verification(false);
+
+    MultipartFormDataItems items{
+        {"document", buffer.str(), "2MB_data", "application/octet-stream"},
+        {"hello", "world", "", ""},
+    };
+
+    auto res = cli.Post("/post_customboundary", {}, items, "abc-abc");
+    ASSERT_TRUE(res);
+    ASSERT_EQ(200, res->status);
+  }
+
+  svr.stop();
+  t.join();
+}
+
+TEST(MultipartFormDataTest, PostInvalidBoundaryChars) {
+
+  std::this_thread::sleep_for(std::chrono::seconds(1));
+
+  std::string data(1024 * 1024 * 2, '&');
+  std::stringstream buffer;
+  buffer << data;
+
+  Client cli("https://localhost:8080");
+
+  MultipartFormDataItems items{
+      {"document", buffer.str(), "2MB_data", "application/octet-stream"},
+      {"hello", "world", "", ""},
+  };
+
+  for (const char &c : " \t\r\n") {
+    auto res =
+        cli.Post("/invalid_boundary", {}, items, string("abc123").append(1, c));
+    ASSERT_EQ(Error::UnsupportedMultipartBoundaryChars, res.error());
+    ASSERT_FALSE(res);
+  }
+}
+
+TEST(MultipartFormDataTest, PutFormData) {
+  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
+
+  svr.Put("/put", [&](const Request &req, const Response & /*res*/,
+                      const ContentReader &content_reader) {
+    if (req.is_multipart_form_data()) {
+      MultipartFormDataItems files;
+      content_reader(
+          [&](const MultipartFormData &file) {
+            files.push_back(file);
+            return true;
+          },
+          [&](const char *data, size_t data_length) {
+            files.back().content.append(data, data_length);
+            return true;
+          });
+
+      EXPECT_TRUE(std::string(files[0].name) == "document");
+      EXPECT_EQ(size_t(1024 * 1024 * 2), files[0].content.size());
+      EXPECT_TRUE(files[0].filename == "2MB_data");
+      EXPECT_TRUE(files[0].content_type == "application/octet-stream");
+
+      EXPECT_TRUE(files[1].name == "hello");
+      EXPECT_TRUE(files[1].content == "world");
+      EXPECT_TRUE(files[1].filename == "");
+      EXPECT_TRUE(files[1].content_type == "");
+    } else {
+      std::string body;
+      content_reader([&](const char *data, size_t data_length) {
+        body.append(data, data_length);
+        return true;
+      });
+    }
+  });
+
+  auto t = std::thread([&]() { svr.listen("localhost", 8080); });
+  while (!svr.is_running()) {
+    std::this_thread::sleep_for(std::chrono::milliseconds(1));
+  }
+  std::this_thread::sleep_for(std::chrono::seconds(1));
+
+  {
+    std::string data(1024 * 1024 * 2, '&');
+    std::stringstream buffer;
+    buffer << data;
+
+    Client cli("https://localhost:8080");
+    cli.enable_server_certificate_verification(false);
+
+    MultipartFormDataItems items{
+        {"document", buffer.str(), "2MB_data", "application/octet-stream"},
+        {"hello", "world", "", ""},
+    };
+
+    auto res = cli.Put("/put", items);
+    ASSERT_TRUE(res);
+    ASSERT_EQ(200, res->status);
+  }
+
+  svr.stop();
+  t.join();
+}
+
+TEST(MultipartFormDataTest, PutFormDataCustomBoundary) {
+  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
+
+  svr.Put("/put_customboundary",
+          [&](const Request &req, const Response & /*res*/,
+              const ContentReader &content_reader) {
+            if (req.is_multipart_form_data()) {
+              MultipartFormDataItems files;
+              content_reader(
+                  [&](const MultipartFormData &file) {
+                    files.push_back(file);
+                    return true;
+                  },
+                  [&](const char *data, size_t data_length) {
+                    files.back().content.append(data, data_length);
+                    return true;
+                  });
+
+              EXPECT_TRUE(std::string(files[0].name) == "document");
+              EXPECT_EQ(size_t(1024 * 1024 * 2), files[0].content.size());
+              EXPECT_TRUE(files[0].filename == "2MB_data");
+              EXPECT_TRUE(files[0].content_type == "application/octet-stream");
+
+              EXPECT_TRUE(files[1].name == "hello");
+              EXPECT_TRUE(files[1].content == "world");
+              EXPECT_TRUE(files[1].filename == "");
+              EXPECT_TRUE(files[1].content_type == "");
+            } else {
+              std::string body;
+              content_reader([&](const char *data, size_t data_length) {
+                body.append(data, data_length);
+                return true;
+              });
+            }
+          });
+
+  auto t = std::thread([&]() { svr.listen("localhost", 8080); });
+  while (!svr.is_running()) {
+    std::this_thread::sleep_for(std::chrono::milliseconds(1));
+  }
+  std::this_thread::sleep_for(std::chrono::seconds(1));
+
+  {
+    std::string data(1024 * 1024 * 2, '&');
+    std::stringstream buffer;
+    buffer << data;
+
+    Client cli("https://localhost:8080");
+    cli.enable_server_certificate_verification(false);
+
+    MultipartFormDataItems items{
+        {"document", buffer.str(), "2MB_data", "application/octet-stream"},
+        {"hello", "world", "", ""},
+    };
+
+    auto res = cli.Put("/put_customboundary", {}, items, "abc-abc_");
+    ASSERT_TRUE(res);
+    ASSERT_EQ(200, res->status);
+  }
+
+  svr.stop();
+  t.join();
+}
+
+TEST(MultipartFormDataTest, PutInvalidBoundaryChars) {
+
+  std::this_thread::sleep_for(std::chrono::seconds(1));
+
+  std::string data(1024 * 1024 * 2, '&');
+  std::stringstream buffer;
+  buffer << data;
+
+  Client cli("https://localhost:8080");
+  cli.enable_server_certificate_verification(false);
+
+  MultipartFormDataItems items{
+      {"document", buffer.str(), "2MB_data", "application/octet-stream"},
+      {"hello", "world", "", ""},
+  };
+
+  for (const char &c : " \t\r\n") {
+    auto res = cli.Put("/put", {}, items, string("abc123").append(1, c));
+    ASSERT_EQ(Error::UnsupportedMultipartBoundaryChars, res.error());
+    ASSERT_FALSE(res);
+  }
+}
+
 #endif
 
+#ifndef _WIN32
+class UnixSocketTest : public ::testing::Test {
+protected:
+  void TearDown() override { std::remove(pathname_.c_str()); }
+
+  void client_GET(const std::string &addr) {
+    httplib::Client cli{addr};
+    cli.set_address_family(AF_UNIX);
+    ASSERT_TRUE(cli.is_valid());
+
+    const auto &result = cli.Get(pattern_);
+    ASSERT_TRUE(result) << "error: " << result.error();
+
+    const auto &resp = result.value();
+    EXPECT_EQ(resp.status, 200);
+    EXPECT_EQ(resp.body, content_);
+  }
+
+  const std::string pathname_{"./httplib-server.sock"};
+  const std::string pattern_{"/hi"};
+  const std::string content_{"Hello World!"};
+};
+
+TEST_F(UnixSocketTest, pathname) {
+  httplib::Server svr;
+  svr.Get(pattern_, [&](const httplib::Request &, httplib::Response &res) {
+    res.set_content(content_, "text/plain");
+  });
+
+  std::thread t{[&] {
+    ASSERT_TRUE(svr.set_address_family(AF_UNIX).listen(pathname_, 80));
+  }};
+  while (!svr.is_running()) {
+    std::this_thread::sleep_for(std::chrono::milliseconds(1));
+  }
+  ASSERT_TRUE(svr.is_running());
+
+  client_GET(pathname_);
+
+  svr.stop();
+  t.join();
+}
+
+#if defined(__linux__) ||                                                      \
+    /* __APPLE__ */ (defined(SOL_LOCAL) && defined(SO_PEERPID))
+TEST_F(UnixSocketTest, PeerPid) {
+  httplib::Server svr;
+  std::string remote_port_val;
+  svr.Get(pattern_, [&](const httplib::Request &req, httplib::Response &res) {
+    res.set_content(content_, "text/plain");
+    remote_port_val = req.get_header_value("REMOTE_PORT");
+  });
+
+  std::thread t{[&] {
+    ASSERT_TRUE(svr.set_address_family(AF_UNIX).listen(pathname_, 80));
+  }};
+  while (!svr.is_running()) {
+    std::this_thread::sleep_for(std::chrono::milliseconds(1));
+  }
+  ASSERT_TRUE(svr.is_running());
+
+  client_GET(pathname_);
+  EXPECT_EQ(std::to_string(getpid()), remote_port_val);
+
+  svr.stop();
+  t.join();
+}
+#endif
+
+#ifdef __linux__
+TEST_F(UnixSocketTest, abstract) {
+  constexpr char svr_path[]{"\x00httplib-server.sock"};
+  const std::string abstract_addr{svr_path, sizeof(svr_path) - 1};
+
+  httplib::Server svr;
+  svr.Get(pattern_, [&](const httplib::Request &, httplib::Response &res) {
+    res.set_content(content_, "text/plain");
+  });
+
+  std::thread t{[&] {
+    ASSERT_TRUE(svr.set_address_family(AF_UNIX).listen(abstract_addr, 80));
+  }};
+  while (!svr.is_running()) {
+    std::this_thread::sleep_for(std::chrono::milliseconds(1));
+  }
+  ASSERT_TRUE(svr.is_running());
+
+  client_GET(abstract_addr);
+
+  svr.stop();
+  t.join();
+}
+#endif
+
+TEST(SocketStream, is_writable_UNIX) {
+  int fds[2];
+  ASSERT_EQ(0, socketpair(AF_UNIX, SOCK_STREAM, 0, fds));
+
+  const auto asSocketStream = [&](socket_t fd,
+                                  std::function<bool(Stream &)> func) {
+    return detail::process_client_socket(fd, 0, 0, 0, 0, func);
+  };
+  asSocketStream(fds[0], [&](Stream &s0) {
+    EXPECT_EQ(s0.socket(), fds[0]);
+    EXPECT_TRUE(s0.is_writable());
+
+    EXPECT_EQ(0, close(fds[1]));
+    EXPECT_FALSE(s0.is_writable());
+
+    return true;
+  });
+  EXPECT_EQ(0, close(fds[0]));
+}
+
+TEST(SocketStream, is_writable_INET) {
+  sockaddr_in addr;
+  memset(&addr, 0, sizeof(addr));
+  addr.sin_family = AF_INET;
+  addr.sin_port = htons(PORT + 1);
+  addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+
+  int disconnected_svr_sock = -1;
+  std::thread svr{[&] {
+    const int s = socket(AF_INET, SOCK_STREAM, 0);
+    ASSERT_LE(0, s);
+    ASSERT_EQ(0, ::bind(s, reinterpret_cast<sockaddr *>(&addr), sizeof(addr)));
+    ASSERT_EQ(0, listen(s, 1));
+    ASSERT_LE(0, disconnected_svr_sock = accept(s, nullptr, nullptr));
+    ASSERT_EQ(0, close(s));
+  }};
+  std::this_thread::sleep_for(std::chrono::milliseconds(100));
+
+  std::thread cli{[&] {
+    const int s = socket(AF_INET, SOCK_STREAM, 0);
+    ASSERT_LE(0, s);
+    ASSERT_EQ(0, connect(s, reinterpret_cast<sockaddr *>(&addr), sizeof(addr)));
+    ASSERT_EQ(0, close(s));
+  }};
+  cli.join();
+  svr.join();
+  ASSERT_NE(disconnected_svr_sock, -1);
+
+  const auto asSocketStream = [&](socket_t fd,
+                                  std::function<bool(Stream &)> func) {
+    return detail::process_client_socket(fd, 0, 0, 0, 0, func);
+  };
+  asSocketStream(disconnected_svr_sock, [&](Stream &ss) {
+    EXPECT_EQ(ss.socket(), disconnected_svr_sock);
+    EXPECT_FALSE(ss.is_writable());
+
+    return true;
+  });
+
+  ASSERT_EQ(0, close(disconnected_svr_sock));
+}
+#endif // #ifndef _WIN32
+
+TEST(TaskQueueTest, IncreaseAtomicInteger) {
+  static constexpr unsigned int number_of_task{1000000};
+  std::atomic_uint count{0};
+  std::unique_ptr<TaskQueue> task_queue{
+      new ThreadPool{CPPHTTPLIB_THREAD_POOL_COUNT}};
+
+  for (unsigned int i = 0; i < number_of_task; ++i) {
+    task_queue->enqueue(
+        [&count] { count.fetch_add(1, std::memory_order_relaxed); });
+  }
+
+  EXPECT_NO_THROW(task_queue->shutdown());
+  EXPECT_EQ(number_of_task, count.load());
+}