cpp-httplib

A C++11 single-file header-only cross platform HTTP/HTTPS library.

It's extremely easy to setup. Just include httplib.h file in your code!

For Windows users: Please read this note.

Server Example

#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");
  });

  svr.Get(R"(/numbers/(\d+))", [&](const Request& req, Response& res) {
    auto numbers = req.matches[1];
    res.set_content(numbers, "text/plain");
  });

  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
txt	text/plain
html, htm	text/html
css	text/css
jpeg, jpg	image/jpg
png	image/png
gif	image/gif
svg	image/svg+xml
ico	image/x-icon
json	application/json
pdf	application/pdf
js	application/javascript
wasm	application/wasm
xml	application/xml
xhtml	application/xhtml+xml

NOTE: These the static file server methods are not thread safe.

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");
});

'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 Content receiver

svr.Post("/content_receiver",
  [&](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;
        });
    } else {
      std::string body;
      content_reader([&](const char *data, size_t data_length) {
        body.append(data, data_length);
        return true;
      });
      res.set_content(body, "text/plain");
    }
  });

Send content with Content provider

const uint64_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
    [data](uint64_t offset, uint64_t length, DataSink &sink) {
      const auto &d = *data;
      sink.write(&d[offset], std::min(length, DATA_CHUNK_SIZE));
    },
    [data] { delete data; });
});

Chunked transfer encoding

svr.Get("/chunked", [&](const Request& req, Response& res) {
  res.set_chunked_content_provider(
    [](uint64_t offset, DataSink &sink) {
       sink.write("123", 3);
       sink.write("345", 3);
       sink.write("789", 3);
       sink.done();
    }
  );
});

Server-Sent Events

Please check here.

Default thread pool support

ThreadPool is used as a default task queue, and the default thread count is set to value from std::thread::hardware_concurrency().

You can change the thread count by setting CPPHTTPLIB_THREAD_POOL_COUNT.

Override the default thread pool with yours

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

  virtual void enqueue(std::function<void()> fn) override {
    pool_.enqueue(fn);
  }

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

private:
  YourThreadPool pool_;
};

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

'Expect: 100-continue' handler

As default, the server sends 100 Continue response for Expect: 100-continue header.

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

// Send a final status without reading the message body.
svr.set_expect_100_continue_handler([](const Request &req, Response &res) {
  return res.status = 401;
});

Client Example

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

int main(void)
{
  // IMPORTANT: 1st parameter must be a hostname or an IP adress string.
  httplib::Client cli("localhost", 1234);

  auto res = cli.Get("/hi");
  if (res && res->status == 200) {
    std::cout << res->body << std::endl;
  }
}

GET with HTTP headers

httplib::Headers headers = {
  { "Accept-Encoding", "gzip, deflate" }
};
auto res = cli.Get("/hi", headers);

GET with Content Receiver

std::string body;

auto res = cli.Get("/large-data",
  [&](const char *data, uint64_t data_length) {
    body.append(data, data_length);
    return true;
  });

assert(res->body.empty());

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");

Connection Timeout

cli.set_timeout_sec(5); // timeouts in 5 seconds

With Progress Callback

httplib::Client client(url, port);

// prints: 0 / 000 bytes => 50% complete
std::shared_ptr<httplib::Response> 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");

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");

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

cli.set_keep_alive_max_count(2); // Default is 5

std::vector<Request> requests;
Get(requests, "/get-request1");
Get(requests, "/get-request2");
Post(requests, "/post-request1", "text", "text/plain");
Post(requests, "/post-request2", "text", "text/plain");

std::vector<Response> responses;
if (cli.send(requests, responses)) {
  for (const auto& res: responses) {
    ...
  }
}

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 specitic network interface

NOTE: This feature is not available on Windows, yet.

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

OpenSSL Support

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

NOTE: cpp-httplib supports 1.1.1 (until 2023-09-11) and 1.0.2 (2019-12-31).

#define CPPHTTPLIB_OPENSSL_SUPPORT

SSLServer svr("./cert.pem", "./key.pem");

SSLClient cli("localhost", 8080);
cli.set_ca_cert_path("./ca-bundle.crt");
cli.enable_server_certificate_verification(true);

Zlib Support

'gzip' compression is available with CPPHTTPLIB_ZLIB_SUPPORT.

The server applies gzip compression to the following MIME type contents:

all text types
image/svg+xml
application/javascript
application/json
application/xml
application/xhtml+xml

Compress content on client

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

Split httplib.h into .h and .cc

> python3 split.py
> ls out
httplib.h  httplib.cc

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: Cygwin on Windows is not supported.

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 634 Commits
.github/workflows		.github/workflows
example		example
test		test
.clang-format		.clang-format
.gitignore		.gitignore
.travis.yml		.travis.yml
LICENSE		LICENSE
README.md		README.md
appveyor.yml		appveyor.yml
httplib.h		httplib.h
split.py		split.py

License

iot-strategy/cpp-httplib

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cpp-httplib

Server Example

Bind a socket to multiple interfaces and any available port

Static File Server

Logging

Error handler

'multipart/form-data' POST data

Receive content with Content receiver

Send content with Content provider

Chunked transfer encoding

Server-Sent Events

Default thread pool support

Override the default thread pool with yours

'Expect: 100-continue' handler

Client Example

GET with HTTP headers

GET with Content Receiver

POST

POST with parameters

POST with Multipart Form Data

PUT

DELETE

OPTIONS

Connection Timeout

With Progress Callback

Authentication

Proxy server support

Range

Keep-Alive connection

Redirect

Use a specitic network interface

OpenSSL Support

Zlib Support

Compress content on client

Split httplib.h into .h and .cc

NOTE

g++

Windows

License

Special Thanks To

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