cpp-httplib

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!

Important

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 (Multi-threaded)

#define CPPHTTPLIB_OPENSSL_SUPPORT
#include "path/to/httplib.h"

// HTTP
httplib::Server svr;

// HTTPS
httplib::SSLServer svr;

svr.Get("/hi", [](const httplib::Request &, httplib::Response &res) {
  res.set_content("Hello World!", "text/plain");
});

svr.listen("0.0.0.0", 8080);

Client

#define CPPHTTPLIB_OPENSSL_SUPPORT
#include "path/to/httplib.h"

// HTTP
httplib::Client cli("http://cpp-httplib-server.yhirose.repl.co");

// HTTPS
httplib::Client cli("https://cpp-httplib-server.yhirose.repl.co");

auto res = cli.Get("/hi");
res->status;
res->body;

SSL Support

SSL support is available with CPPHTTPLIB_OPENSSL_SUPPORT. libssl and libcrypto should be linked.

Note

cpp-httplib currently supports only version 3.0 or later. Please see this page to get more information.

Tip

For macOS: cpp-httplib now can use system certs with CPPHTTPLIB_USE_CERTS_FROM_MACOSX_KEYCHAIN. CoreFoundation and Security should be linked with -framework.

#define CPPHTTPLIB_OPENSSL_SUPPORT
#include "path/to/httplib.h"

// Server
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");

// Disable cert verification
cli.enable_server_certificate_verification(false);

// Disable host verification
cli.enable_server_host_verification(false);

Note

When using SSL, it seems impossible to avoid SIGPIPE in all cases, since on some operating systems, SIGPIPE can only be suppressed on a per-message basis, but there is no way to make the OpenSSL library do so for its internal communications. If your program needs to avoid being terminated on SIGPIPE, the only fully general way might be to set up a signal handler for SIGPIPE to handle or ignore it yourself.

Server

#include <httplib.h>

int main(void)
{
  using namespace httplib;

  Server svr;

  svr.Get("/hi", [](const Request& req, Response& res) {
    res.set_content("Hello World!", "text/plain");
  });

  // Match the request path against a regular expression
  // and extract its captures
  svr.Get(R"(/numbers/(\d+))", [&](const Request& req, Response& res) {
    auto numbers = req.matches[1];
    res.set_content(numbers, "text/plain");
  });

  // Capture the second segment of the request path as "id" path param
  svr.Get("/users/:id", [&](const Request& req, Response& res) {
    auto user_id = req.path_params.at("id");
    res.set_content(user_id, "text/plain");
  });

  // Extract values from HTTP headers and URL query params
  svr.Get("/body-header-param", [](const Request& req, Response& res) {
    if (req.has_header("Content-Length")) {
      auto val = req.get_header_value("Content-Length");
    }
    if (req.has_param("key")) {
      auto val = req.get_param_value("key");
    }
    res.set_content(req.body, "text/plain");
  });

  svr.Get("/stop", [&](const Request& req, Response& res) {
    svr.stop();
  });

  svr.listen("localhost", 1234);
}

Post, Put, Delete and Options methods are also supported.

Bind a socket to multiple interfaces and any available port

int port = svr.bind_to_any_port("0.0.0.0");
svr.listen_after_bind();

Static File Server

// Mount / to ./www directory
auto ret = svr.set_mount_point("/", "./www");
if (!ret) {
  // The specified base directory doesn't exist...
}

// Mount /public to ./www directory
ret = svr.set_mount_point("/public", "./www");

// Mount /public to ./www1 and ./www2 directories
ret = svr.set_mount_point("/public", "./www1"); // 1st order to search
ret = svr.set_mount_point("/public", "./www2"); // 2nd order to search

// Remove mount /
ret = svr.remove_mount_point("/");

// Remove mount /public
ret = svr.remove_mount_point("/public");

// User defined file extension and MIME type mappings
svr.set_file_extension_and_mimetype_mapping("cc", "text/x-c");
svr.set_file_extension_and_mimetype_mapping("cpp", "text/x-c");
svr.set_file_extension_and_mimetype_mapping("hh", "text/x-h");

The followings are built-in mappings:

Extension	MIME Type	Extension	MIME Type
css	text/css	mpga	audio/mpeg
csv	text/csv	weba	audio/webm
txt	text/plain	wav	audio/wave
vtt	text/vtt	otf	font/otf
html, htm	text/html	ttf	font/ttf
apng	image/apng	woff	font/woff
avif	image/avif	woff2	font/woff2
bmp	image/bmp	7z	application/x-7z-compressed
gif	image/gif	atom	application/atom+xml
png	image/png	pdf	application/pdf
svg	image/svg+xml	mjs, js	application/javascript
webp	image/webp	json	application/json
ico	image/x-icon	rss	application/rss+xml
tif	image/tiff	tar	application/x-tar
tiff	image/tiff	xhtml, xht	application/xhtml+xml
jpeg, jpg	image/jpeg	xslt	application/xslt+xml
mp4	video/mp4	xml	application/xml
mpeg	video/mpeg	gz	application/gzip
webm	video/webm	zip	application/zip
mp3	audio/mp3	wasm	application/wasm

Warning

These static file server methods are not thread-safe.

File request handler

// The handler is called right before the response is sent to a client
svr.set_file_request_handler([](const Request &req, Response &res) {
  ...
});

Logging

svr.set_logger([](const auto& req, const auto& res) {
  your_logger(req, res);
});

Error handler

svr.set_error_handler([](const auto& req, auto& res) {
  auto fmt = "<p>Error Status: <span style='color:red;'>%d</span></p>";
  char buf[BUFSIZ];
  snprintf(buf, sizeof(buf), fmt, res.status);
  res.set_content(buf, "text/html");
});

Exception handler

The exception handler gets called if a user routing handler throws an error.

svr.set_exception_handler([](const auto& req, auto& res, std::exception_ptr ep) {
  auto fmt = "<h1>Error 500</h1><p>%s</p>";
  char buf[BUFSIZ];
  try {
    std::rethrow_exception(ep);
  } catch (std::exception &e) {
    snprintf(buf, sizeof(buf), fmt, e.what());
  } catch (...) { // See the following NOTE
    snprintf(buf, sizeof(buf), fmt, "Unknown Exception");
  }
  res.set_content(buf, "text/html");
  res.status = StatusCode::InternalServerError_500;
});

Caution

if you don't provide the catch (...) block for a rethrown exception pointer, an uncaught exception will end up causing the server crash. Be careful!

Pre routing handler

svr.set_pre_routing_handler([](const auto& req, auto& res) {
  if (req.path == "/hello") {
    res.set_content("world", "text/html");
    return Server::HandlerResponse::Handled;
  }
  return Server::HandlerResponse::Unhandled;
});

Post routing handler

svr.set_post_routing_handler([](const auto& req, auto& res) {
  res.set_header("ADDITIONAL_HEADER", "value");
});

'multipart/form-data' POST data

svr.Post("/multipart", [&](const auto& req, auto& res) {
  auto size = req.files.size();
  auto ret = req.has_file("name1");
  const auto& file = req.get_file_value("name1");
  // file.filename;
  // file.content_type;
  // file.content;
});

Receive content with a content receiver

svr.Post("/content_receiver",
  [&](const Request &req, Response &res, const ContentReader &content_reader) {
    if (req.is_multipart_form_data()) {
      // NOTE: `content_reader` is blocking until every form data field is read
      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;
        });
    } else {
      std::string body;
      content_reader([&](const char *data, size_t data_length) {
        body.append(data, data_length);
        return true;
      });
    }
  });

Send content with the content provider

const size_t DATA_CHUNK_SIZE = 4;

svr.Get("/stream", [&](const Request &req, Response &res) {
  auto data = new std::string("abcdefg");

  res.set_content_provider(
    data->size(), // Content length
    "text/plain", // Content type
    [&, data](size_t offset, size_t length, DataSink &sink) {
      const auto &d = *data;
      sink.write(&d[offset], std::min(length, DATA_CHUNK_SIZE));
      return true; // return 'false' if you want to cancel the process.
    },
    [data](bool success) { delete data; });
});

Without content length:

svr.Get("/stream", [&](const Request &req, Response &res) {
  res.set_content_provider(
    "text/plain", // Content type
    [&](size_t offset, DataSink &sink) {
      if (/* there is still data */) {
        std::vector<char> data;
        // prepare data...
        sink.write(data.data(), data.size());
      } else {
        sink.done(); // No more data
      }
      return true; // return 'false' if you want to cancel the process.
    });
});

Chunked transfer encoding

svr.Get("/chunked", [&](const Request& req, Response& res) {
  res.set_chunked_content_provider(
    "text/plain",
    [](size_t offset, DataSink &sink) {
      sink.write("123", 3);
      sink.write("345", 3);
      sink.write("789", 3);
      sink.done(); // No more data
      return true; // return 'false' if you want to cancel the process.
    }
  );
});

With trailer:

svr.Get("/chunked", [&](const Request& req, Response& res) {
  res.set_header("Trailer", "Dummy1, Dummy2");
  res.set_chunked_content_provider(
    "text/plain",
    [](size_t offset, DataSink &sink) {
      sink.write("123", 3);
      sink.write("345", 3);
      sink.write("789", 3);
      sink.done_with_trailer({
        {"Dummy1", "DummyVal1"},
        {"Dummy2", "DummyVal2"}
      });
      return true;
    }
  );
});

Send file content

svr.Get("/content", [&](const Request &req, Response &res) {
  res.set_file_content("./path/to/conent.html");
});

svr.Get("/content", [&](const Request &req, Response &res) {
  res.set_file_content("./path/to/conent", "text/html");
});

'Expect: 100-continue' handler

By default, the server sends a 100 Continue response for an Expect: 100-continue header.

// Send a '417 Expectation Failed' response.
svr.set_expect_100_continue_handler([](const Request &req, Response &res) {
  return StatusCode::ExpectationFailed_417;
});

// Send a final status without reading the message body.
svr.set_expect_100_continue_handler([](const Request &req, Response &res) {
  return res.status = StatusCode::Unauthorized_401;
});

Keep-Alive connection

svr.set_keep_alive_max_count(2); // Default is 5
svr.set_keep_alive_timeout(10);  // Default is 5

Timeout

svr.set_read_timeout(5, 0); // 5 seconds
svr.set_write_timeout(5, 0); // 5 seconds
svr.set_idle_interval(0, 100000); // 100 milliseconds

Set maximum payload length for reading a request body

svr.set_payload_max_length(1024 * 1024 * 512); // 512MB

Note

When the request body content type is 'www-form-urlencoded', the actual payload length shouldn't exceed CPPHTTPLIB_FORM_URL_ENCODED_PAYLOAD_MAX_LENGTH.

Server-Sent Events

Please see Server example and Client example.

Default thread pool support

ThreadPool is used as a default task queue, and the default thread count is 8, or std::thread::hardware_concurrency(). You can change it with CPPHTTPLIB_THREAD_POOL_COUNT.

If you want to set the thread count at runtime, there is no convenient way... But here is how.

svr.new_task_queue = [] { return new ThreadPool(12); };

You can also provide an optional parameter to limit the maximum number of pending requests, i.e. requests accept()ed by the listener but still waiting to be serviced by worker threads.

svr.new_task_queue = [] { return new ThreadPool(/*num_threads=*/12, /*max_queued_requests=*/18); };

Default limit is 0 (unlimited). Once the limit is reached, the listener will shutdown the client connection.

Override the default thread pool with yours

You can supply your own thread pool implementation according to your need.

class YourThreadPoolTaskQueue : public TaskQueue {
public:
  YourThreadPoolTaskQueue(size_t n) {
    pool_.start_with_thread_count(n);
  }

  virtual bool enqueue(std::function<void()> fn) override {
    /* Return true if the task was actually enqueued, or false
     * if the caller must drop the corresponding connection. */
    return pool_.enqueue(fn);
  }

  virtual void shutdown() override {
    pool_.shutdown_gracefully();
  }

private:
  YourThreadPool pool_;
};

svr.new_task_queue = [] {
  return new YourThreadPoolTaskQueue(12);
};

Client

#include <httplib.h>
#include <iostream>

int main(void)
{
  httplib::Client cli("localhost", 1234);

  if (auto res = cli.Get("/hi")) {
    if (res->status == StatusCode::OK_200) {
      std::cout << res->body << std::endl;
    }
  } else {
    auto err = res.error();
    std::cout << "HTTP error: " << httplib::to_string(err) << std::endl;
  }
}

Tip

Constructor with scheme-host-port string is now supported!

httplib::Client cli("localhost");
httplib::Client cli("localhost:8080");
httplib::Client cli("http://localhost");
httplib::Client cli("http://localhost:8080");
httplib::Client cli("https://localhost");
httplib::SSLClient cli("localhost");

Error code

Here is the list of errors from Result::error().

enum Error {
  Success = 0,
  Unknown,
  Connection,
  BindIPAddress,
  Read,
  Write,
  ExceedRedirectCount,
  Canceled,
  SSLConnection,
  SSLLoadingCerts,
  SSLServerVerification,
  UnsupportedMultipartBoundaryChars,
  Compression,
  ConnectionTimeout,
};

GET with HTTP headers

httplib::Headers headers = {
  { "Hello", "World!" }
};
auto res = cli.Get("/hi", headers);

or

auto res = cli.Get("/hi", {{"Hello", "World!"}});

or

cli.set_default_headers({
  { "Hello", "World!" }
});
auto res = cli.Get("/hi");

POST

res = cli.Post("/post", "text", "text/plain");
res = cli.Post("/person", "name=john1&note=coder", "application/x-www-form-urlencoded");

POST with parameters

httplib::Params params;
params.emplace("name", "john");
params.emplace("note", "coder");

auto res = cli.Post("/post", params);

or

httplib::Params params{
  { "name", "john" },
  { "note", "coder" }
};

auto res = cli.Post("/post", params);

POST with Multipart Form Data

httplib::MultipartFormDataItems items = {
  { "text1", "text default", "", "" },
  { "text2", "aωb", "", "" },
  { "file1", "h\ne\n\nl\nl\no\n", "hello.txt", "text/plain" },
  { "file2", "{\n  \"world\", true\n}\n", "world.json", "application/json" },
  { "file3", "", "", "application/octet-stream" },
};

auto res = cli.Post("/multipart", items);

PUT

res = cli.Put("/resource/foo", "text", "text/plain");

DELETE

res = cli.Delete("/resource/foo");

OPTIONS

res = cli.Options("*");
res = cli.Options("/resource/foo");

Timeout

cli.set_connection_timeout(0, 300000); // 300 milliseconds
cli.set_read_timeout(5, 0); // 5 seconds
cli.set_write_timeout(5, 0); // 5 seconds

Receive content with a content receiver

std::string body;

auto res = cli.Get("/large-data",
  [&](const char *data, size_t data_length) {
    body.append(data, data_length);
    return true;
  });

std::string body;

auto res = cli.Get(
  "/stream", Headers(),
  [&](const Response &response) {
    EXPECT_EQ(StatusCode::OK_200, response.status);
    return true; // return 'false' if you want to cancel the request.
  },
  [&](const char *data, size_t data_length) {
    body.append(data, data_length);
    return true; // return 'false' if you want to cancel the request.
  });

Send content with a content provider

std::string body = ...;

auto res = cli.Post(
  "/stream", body.size(),
  [](size_t offset, size_t length, DataSink &sink) {
    sink.write(body.data() + offset, length);
    return true; // return 'false' if you want to cancel the request.
  },
  "text/plain");

Chunked transfer encoding

auto res = cli.Post(
  "/stream",
  [](size_t offset, DataSink &sink) {
    sink.os << "chunked data 1";
    sink.os << "chunked data 2";
    sink.os << "chunked data 3";
    sink.done();
    return true; // return 'false' if you want to cancel the request.
  },
  "text/plain");

With Progress Callback

httplib::Client cli(url, port);

// prints: 0 / 000 bytes => 50% complete
auto res = cli.Get("/", [](uint64_t len, uint64_t total) {
  printf("%lld / %lld bytes => %d%% complete\n",
    len, total,
    (int)(len*100/total));
  return true; // return 'false' if you want to cancel the request.
}
);

Authentication

// Basic Authentication
cli.set_basic_auth("user", "pass");

// Digest Authentication
cli.set_digest_auth("user", "pass");

// Bearer Token Authentication
cli.set_bearer_token_auth("token");

Note

OpenSSL is required for Digest Authentication.

Proxy server support

cli.set_proxy("host", port);

// Basic Authentication
cli.set_proxy_basic_auth("user", "pass");

// Digest Authentication
cli.set_proxy_digest_auth("user", "pass");

// Bearer Token Authentication
cli.set_proxy_bearer_token_auth("pass");

Note

OpenSSL is required for Digest Authentication.

Range

httplib::Client cli("httpbin.org");

auto res = cli.Get("/range/32", {
  httplib::make_range_header({{1, 10}}) // 'Range: bytes=1-10'
});
// res->status should be 206.
// res->body should be "bcdefghijk".

httplib::make_range_header({{1, 10}, {20, -1}})      // 'Range: bytes=1-10, 20-'
httplib::make_range_header({{100, 199}, {500, 599}}) // 'Range: bytes=100-199, 500-599'
httplib::make_range_header({{0, 0}, {-1, 1}})        // 'Range: bytes=0-0, -1'

Keep-Alive connection

httplib::Client cli("localhost", 1234);

cli.Get("/hello");         // with "Connection: close"

cli.set_keep_alive(true);
cli.Get("/world");

cli.set_keep_alive(false);
cli.Get("/last-request");  // with "Connection: close"

Redirect

httplib::Client cli("yahoo.com");

auto res = cli.Get("/");
res->status; // 301

cli.set_follow_location(true);
res = cli.Get("/");
res->status; // 200

Use a specific network interface

Note

This feature is not available on Windows, yet.

cli.set_interface("eth0"); // Interface name, IP address or host name

Compression

The server can apply compression to the following MIME type contents:

all text types except text/event-stream
image/svg+xml
application/javascript
application/json
application/xml
application/xhtml+xml

Zlib Support

'gzip' compression is available with CPPHTTPLIB_ZLIB_SUPPORT. libz should be linked.

Brotli Support

Brotli compression is available with CPPHTTPLIB_BROTLI_SUPPORT. Necessary libraries should be linked. Please see https://github.com/google/brotli for more detail.

Default `Accept-Encoding` value

The default Acdcept-Encoding value contains all possible compression types. So, the following two examples are same.

res = cli.Get("/resource/foo");
res = cli.Get("/resource/foo", {{"Accept-Encoding", "gzip, deflate, br"}});

If we don't want a response without compression, we have to set Accept-Encoding to an empty string. This behavior is similar to curl.

res = cli.Get("/resource/foo", {{"Accept-Encoding", ""}});

Compress request body on client

cli.set_compress(true);
res = cli.Post("/resource/foo", "...", "text/plain");

Compress response body on client

cli.set_decompress(false);
res = cli.Get("/resource/foo");
res->body; // Compressed data

Use `poll` instead of `select`

select system call is used as default since it's more widely supported. If you want to let cpp-httplib use poll instead, you can do so with CPPHTTPLIB_USE_POLL.

Unix Domain Socket Support

Unix Domain Socket support is available on Linux and macOS.

// Server
httplib::Server svr("./my-socket.sock");
svr.set_address_family(AF_UNIX).listen("./my-socket.sock", 80);

// Client
httplib::Client cli("./my-socket.sock");
cli.set_address_family(AF_UNIX);

"my-socket.sock" can be a relative path or an absolute path. You application must have the appropriate permissions for the path. You can also use an abstract socket address on Linux. To use an abstract socket address, prepend a null byte ('\x00') to the path.

Split httplib.h into .h and .cc

$ ./split.py -h
usage: split.py [-h] [-e EXTENSION] [-o OUT]

This script splits httplib.h into .h and .cc parts.

optional arguments:
  -h, --help            show this help message and exit
  -e EXTENSION, --extension EXTENSION
                        extension of the implementation file (default: cc)
  -o OUT, --out OUT     where to write the files (default: out)

$ ./split.py
Wrote out/httplib.h and out/httplib.cc

Dockerfile for Static HTTP Server

Dockerfile for static HTTP server is available. Port number of this HTTP server is 80, and it serves static files from /html directory in the container.

> docker build -t cpp-httplib-server .
...

> docker run --rm -it -p 8080:80 -v ./docker/html:/html cpp-httplib-server
Serving HTTP on 0.0.0.0 port 80 ...
192.168.65.1 - - [31/Aug/2024:21:33:56 +0000] "GET / HTTP/1.1" 200 599 "-" "curl/8.7.1"
192.168.65.1 - - [31/Aug/2024:21:34:26 +0000] "GET / HTTP/1.1" 200 599 "-" "Mozilla/5.0 ..."
192.168.65.1 - - [31/Aug/2024:21:34:26 +0000] "GET /favicon.ico HTTP/1.1" 404 152 "-" "Mozilla/5.0 ..."

From Docker Hub

> docker run --rm -it -p 8080:80 -v ./docker/html:/html yhirose4dockerhub/cpp-httplib-server
...

> docker run --init --rm -it -p 8080:80 -v ./docker/html:/html cpp-httplib-server
Serving HTTP on 0.0.0.0 port 80 ...
192.168.65.1 - - [31/Aug/2024:21:33:56 +0000] "GET / HTTP/1.1" 200 599 "-" "curl/8.7.1"
192.168.65.1 - - [31/Aug/2024:21:34:26 +0000] "GET / HTTP/1.1" 200 599 "-" "Mozilla/5.0 ..."
192.168.65.1 - - [31/Aug/2024:21:34:26 +0000] "GET /favicon.ico HTTP/1.1" 404 152 "-" "Mozilla/5.0 ..."

NOTE

g++

g++ 4.8 and below cannot build this library since <regex> in the versions are broken.

Windows

Include httplib.h before Windows.h or include Windows.h by defining WIN32_LEAN_AND_MEAN beforehand.

#include <httplib.h>
#include <Windows.h>

#define WIN32_LEAN_AND_MEAN
#include <Windows.h>
#include <httplib.h>

Note

cpp-httplib officially supports only the latest Visual Studio. It might work with former versions of Visual Studio, but I can no longer verify it. Pull requests are always welcome for the older versions of Visual Studio unless they break the C++11 conformance.

Note

Windows 8 or lower, Visual Studio 2013 or lower, and Cygwin and MSYS2 including MinGW are neither supported nor tested.

License

Special Thanks To

These folks made great contributions to polish this library to totally another level from a simple toy!

Name		Name	Last commit message	Last commit date
Latest commit History 1,434 Commits
.github/workflows		.github/workflows
benchmark		benchmark
cmake		cmake
docker		docker
example		example
test		test
.clang-format		.clang-format
.gitattributes		.gitattributes
.gitignore		.gitignore
CMakeLists.txt		CMakeLists.txt
Dockerfile		Dockerfile
LICENSE		LICENSE
README.md		README.md
docker-compose.yml		docker-compose.yml
httplib.h		httplib.h
meson.build		meson.build
meson_options.txt		meson_options.txt
split.py		split.py

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yhirose/cpp-httplib

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cpp-httplib

Simple examples

Server (Multi-threaded)

Client

SSL Support

Server

Bind a socket to multiple interfaces and any available port

Static File Server

File request handler

Logging

Error handler

Exception handler

Pre routing handler

Post routing handler

'multipart/form-data' POST data

Receive content with a content receiver

Send content with the content provider

Chunked transfer encoding

Send file content

'Expect: 100-continue' handler

Keep-Alive connection

Timeout

Set maximum payload length for reading a request body

Server-Sent Events

Default thread pool support

Override the default thread pool with yours

Client

Error code

GET with HTTP headers

POST

POST with parameters

POST with Multipart Form Data

PUT

DELETE

OPTIONS

Timeout

Receive content with a content receiver

Send content with a content provider

Chunked transfer encoding

With Progress Callback

Authentication

Proxy server support

Range

Keep-Alive connection

Redirect

Use a specific network interface

Compression

Zlib Support

Brotli Support

Default Accept-Encoding value

Compress request body on client

Compress response body on client

Use poll instead of select

Unix Domain Socket Support

Split httplib.h into .h and .cc

Dockerfile for Static HTTP Server

NOTE

g++

Windows

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Default `Accept-Encoding` value

Use `poll` instead of `select`

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