790 lines
19 KiB
Markdown
Executable file
790 lines
19 KiB
Markdown
Executable file
cpp-httplib
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===========
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[](https://github.com/yhirose/cpp-httplib/actions)
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A C++11 single-file header-only cross platform HTTP/HTTPS library.
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It's extremely easy to setup. Just include the **httplib.h** file in your code!
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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.
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Simple examples
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---------------
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#### Server
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```c++
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#define CPPHTTPLIB_OPENSSL_SUPPORT
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#include "path/to/httplib.h"
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// HTTP
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httplib::Server svr;
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// HTTPS
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httplib::SSLServer svr;
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svr.Get("/hi", [](const httplib::Request &, httplib::Response &res) {
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res.set_content("Hello World!", "text/plain");
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});
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svr.listen("0.0.0.0", 8080);
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```
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#### Client
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```c++
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#define CPPHTTPLIB_OPENSSL_SUPPORT
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#include "path/to/httplib.h"
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// HTTP
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httplib::Client cli("http://cpp-httplib-server.yhirose.repl.co");
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// HTTPS
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httplib::Client cli("https://cpp-httplib-server.yhirose.repl.co");
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auto res = cli.Get("/hi");
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res->status;
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res->body;
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```
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### Try out the examples on Repl.it!
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1. Run server at https://repl.it/@yhirose/cpp-httplib-server
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2. Run client at https://repl.it/@yhirose/cpp-httplib-client
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SSL Support
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-----------
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SSL support is available with `CPPHTTPLIB_OPENSSL_SUPPORT`. `libssl` and `libcrypto` should be linked.
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NOTE: cpp-httplib currently supports only version 1.1.1.
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```c++
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#define CPPHTTPLIB_OPENSSL_SUPPORT
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#include "path/to/httplib.h"
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// Server
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httplib::SSLServer svr("./cert.pem", "./key.pem");
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// Client
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httplib::Client cli("https://localhost:1234"); // scheme + host
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httplib::SSLClient cli("localhost:1234"); // host
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// Use your CA bundle
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cli.set_ca_cert_path("./ca-bundle.crt");
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// Disable cert verification
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cli.enable_server_certificate_verification(false);
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```
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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.
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Server
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------
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```c++
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#include <httplib.h>
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int main(void)
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{
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using namespace httplib;
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Server svr;
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svr.Get("/hi", [](const Request& req, Response& res) {
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res.set_content("Hello World!", "text/plain");
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});
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svr.Get(R"(/numbers/(\d+))", [&](const Request& req, Response& res) {
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auto numbers = req.matches[1];
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res.set_content(numbers, "text/plain");
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});
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svr.Get("/body-header-param", [](const Request& req, Response& res) {
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if (req.has_header("Content-Length")) {
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auto val = req.get_header_value("Content-Length");
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}
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if (req.has_param("key")) {
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auto val = req.get_param_value("key");
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}
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res.set_content(req.body, "text/plain");
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});
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svr.Get("/stop", [&](const Request& req, Response& res) {
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svr.stop();
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});
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svr.listen("localhost", 1234);
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}
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```
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`Post`, `Put`, `Delete` and `Options` methods are also supported.
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### Bind a socket to multiple interfaces and any available port
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```cpp
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int port = svr.bind_to_any_port("0.0.0.0");
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svr.listen_after_bind();
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```
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### Static File Server
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```cpp
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// Mount / to ./www directory
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auto ret = svr.set_mount_point("/", "./www");
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if (!ret) {
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// The specified base directory doesn't exist...
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}
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// Mount /public to ./www directory
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ret = svr.set_mount_point("/public", "./www");
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// Mount /public to ./www1 and ./www2 directories
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ret = svr.set_mount_point("/public", "./www1"); // 1st order to search
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ret = svr.set_mount_point("/public", "./www2"); // 2nd order to search
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// Remove mount /
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ret = svr.remove_mount_point("/");
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// Remove mount /public
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ret = svr.remove_mount_point("/public");
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```
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```cpp
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// User defined file extension and MIME type mappings
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svr.set_file_extension_and_mimetype_mapping("cc", "text/x-c");
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svr.set_file_extension_and_mimetype_mapping("cpp", "text/x-c");
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svr.set_file_extension_and_mimetype_mapping("hh", "text/x-h");
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```
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The followings are built-in mappings:
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| Extension | MIME Type | Extension | MIME Type |
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| :--------- | :-------------------------- | :--------- | :-------------------------- |
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| css | text/css | mpga | audio/mpeg |
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| csv | text/csv | weba | audio/webm |
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| txt | text/plain | wav | audio/wave |
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| vtt | text/vtt | otf | font/otf |
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| html, htm | text/html | ttf | font/ttf |
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| apng | image/apng | woff | font/woff |
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| avif | image/avif | woff2 | font/woff2 |
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| bmp | image/bmp | 7z | application/x-7z-compressed |
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| gif | image/gif | atom | application/atom+xml |
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| png | image/png | pdf | application/pdf |
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| svg | image/svg+xml | mjs, js | application/javascript |
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| webp | image/webp | json | application/json |
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| ico | image/x-icon | rss | application/rss+xml |
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| tif | image/tiff | tar | application/x-tar |
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| tiff | image/tiff | xhtml, xht | application/xhtml+xml |
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| jpeg, jpg | image/jpeg | xslt | application/xslt+xml |
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| mp4 | video/mp4 | xml | application/xml |
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| mpeg | video/mpeg | gz | application/gzip |
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| webm | video/webm | zip | application/zip |
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| mp3 | audio/mp3 | wasm | application/wasm |
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NOTE: These static file server methods are not thread-safe.
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### Logging
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```cpp
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svr.set_logger([](const auto& req, const auto& res) {
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your_logger(req, res);
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});
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```
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### Error handler
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```cpp
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svr.set_error_handler([](const auto& req, auto& res) {
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auto fmt = "<p>Error Status: <span style='color:red;'>%d</span></p>";
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char buf[BUFSIZ];
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snprintf(buf, sizeof(buf), fmt, res.status);
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res.set_content(buf, "text/html");
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});
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```
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### Exception handler
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The exception handler gets called if a user routing handler throws an error.
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```cpp
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svr.set_exception_handler([](const auto& req, auto& res, std::exception &e) {
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res.status = 500;
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auto fmt = "<h1>Error 500</h1><p>%s</p>";
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char buf[BUFSIZ];
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snprintf(buf, sizeof(buf), fmt, e.what());
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res.set_content(buf, "text/html");
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});
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```
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### Pre routing handler
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```cpp
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svr.set_pre_routing_handler([](const auto& req, auto& res) -> bool {
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if (req.path == "/hello") {
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res.set_content("world", "text/html");
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return Server::HandlerResponse::Handled;
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}
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return Server::HandlerResponse::Unhandled;
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});
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```
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### Post routing handler
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```cpp
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svr.set_post_routing_handler([](const auto& req, auto& res) {
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res.set_header("ADDITIONAL_HEADER", "value");
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});
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```
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### 'multipart/form-data' POST data
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```cpp
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svr.Post("/multipart", [&](const auto& req, auto& res) {
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auto size = req.files.size();
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auto ret = req.has_file("name1");
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const auto& file = req.get_file_value("name1");
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// file.filename;
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// file.content_type;
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// file.content;
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});
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```
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### Receive content with a content receiver
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```cpp
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svr.Post("/content_receiver",
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[&](const Request &req, Response &res, const ContentReader &content_reader) {
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if (req.is_multipart_form_data()) {
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MultipartFormDataItems files;
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content_reader(
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[&](const MultipartFormData &file) {
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files.push_back(file);
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return true;
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},
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[&](const char *data, size_t data_length) {
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files.back().content.append(data, data_length);
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return true;
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});
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} else {
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std::string body;
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content_reader([&](const char *data, size_t data_length) {
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body.append(data, data_length);
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return true;
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});
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res.set_content(body, "text/plain");
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}
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});
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```
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### Send content with the content provider
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```cpp
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const size_t DATA_CHUNK_SIZE = 4;
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svr.Get("/stream", [&](const Request &req, Response &res) {
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auto data = new std::string("abcdefg");
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res.set_content_provider(
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data->size(), // Content length
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"text/plain", // Content type
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[data](size_t offset, size_t length, DataSink &sink) {
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const auto &d = *data;
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sink.write(&d[offset], std::min(length, DATA_CHUNK_SIZE));
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return true; // return 'false' if you want to cancel the process.
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},
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[data](bool success) { delete data; });
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});
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```
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Without content length:
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```cpp
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svr.Get("/stream", [&](const Request &req, Response &res) {
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res.set_content_provider(
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"text/plain", // Content type
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[&](size_t offset, size_t length, DataSink &sink) {
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if (/* there is still data */) {
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std::vector<char> data;
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// prepare data...
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sink.write(data.data(), data.size());
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} else {
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sink.done(); // No more data
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}
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return true; // return 'false' if you want to cancel the process.
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});
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});
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```
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### Chunked transfer encoding
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```cpp
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svr.Get("/chunked", [&](const Request& req, Response& res) {
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res.set_chunked_content_provider(
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"text/plain",
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[](size_t offset, DataSink &sink) {
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sink.write("123", 3);
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sink.write("345", 3);
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sink.write("789", 3);
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sink.done(); // No more data
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return true; // return 'false' if you want to cancel the process.
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}
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);
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});
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```
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### 'Expect: 100-continue' handler
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By default, the server sends a `100 Continue` response for an `Expect: 100-continue` header.
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```cpp
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// Send a '417 Expectation Failed' response.
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svr.set_expect_100_continue_handler([](const Request &req, Response &res) {
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return 417;
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});
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```
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```cpp
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// Send a final status without reading the message body.
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svr.set_expect_100_continue_handler([](const Request &req, Response &res) {
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return res.status = 401;
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});
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```
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### Keep-Alive connection
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```cpp
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svr.set_keep_alive_max_count(2); // Default is 5
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svr.set_keep_alive_timeout(10); // Default is 5
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```
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### Timeout
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```c++
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svr.set_read_timeout(5, 0); // 5 seconds
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svr.set_write_timeout(5, 0); // 5 seconds
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svr.set_idle_interval(0, 100000); // 100 milliseconds
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```
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### Set maximum payload length for reading a request body
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```c++
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svr.set_payload_max_length(1024 * 1024 * 512); // 512MB
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```
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### Server-Sent Events
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Please see [Server example](https://github.com/yhirose/cpp-httplib/blob/master/example/ssesvr.cc) and [Client example](https://github.com/yhirose/cpp-httplib/blob/master/example/ssecli.cc).
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### Default thread pool support
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`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`.
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If you want to set the thread count at runtime, there is no convenient way... But here is how.
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```cpp
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svr.new_task_queue = [] { return new ThreadPool(12); };
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```
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### Override the default thread pool with yours
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You can supply your own thread pool implementation according to your need.
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```cpp
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class YourThreadPoolTaskQueue : public TaskQueue {
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public:
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YourThreadPoolTaskQueue(size_t n) {
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pool_.start_with_thread_count(n);
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}
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virtual void enqueue(std::function<void()> fn) override {
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pool_.enqueue(fn);
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}
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virtual void shutdown() override {
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pool_.shutdown_gracefully();
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}
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private:
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YourThreadPool pool_;
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};
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svr.new_task_queue = [] {
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return new YourThreadPoolTaskQueue(12);
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};
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```
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Client
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------
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```c++
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#include <httplib.h>
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#include <iostream>
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int main(void)
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{
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httplib::Client cli("localhost", 1234);
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if (auto res = cli.Get("/hi")) {
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if (res->status == 200) {
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std::cout << res->body << std::endl;
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}
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} else {
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auto err = res.error();
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...
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}
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}
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```
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NOTE: Constructor with scheme-host-port string is now supported!
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```c++
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httplib::Client cli("localhost");
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httplib::Client cli("localhost:8080");
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httplib::Client cli("http://localhost");
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httplib::Client cli("http://localhost:8080");
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httplib::Client cli("https://localhost");
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httplib::SSLClient cli("localhost");
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```
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### Error code
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Here is the list of errors from `Result::error()`.
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```c++
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enum Error {
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Success = 0,
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Unknown,
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Connection,
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BindIPAddress,
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Read,
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Write,
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ExceedRedirectCount,
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Canceled,
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SSLConnection,
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SSLLoadingCerts,
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SSLServerVerification,
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UnsupportedMultipartBoundaryChars
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};
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```
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### GET with HTTP headers
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```c++
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httplib::Headers headers = {
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{ "Accept-Encoding", "gzip, deflate" }
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};
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auto res = cli.Get("/hi", headers);
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```
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or
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```c++
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cli.set_default_headers({
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{ "Accept-Encoding", "gzip, deflate" }
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});
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auto res = cli.Get("/hi");
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```
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### POST
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```c++
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res = cli.Post("/post", "text", "text/plain");
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res = cli.Post("/person", "name=john1¬e=coder", "application/x-www-form-urlencoded");
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```
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### POST with parameters
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```c++
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httplib::Params params;
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params.emplace("name", "john");
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params.emplace("note", "coder");
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auto res = cli.Post("/post", params);
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```
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or
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```c++
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httplib::Params params{
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{ "name", "john" },
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{ "note", "coder" }
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};
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auto res = cli.Post("/post", params);
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```
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### POST with Multipart Form Data
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```c++
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httplib::MultipartFormDataItems items = {
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{ "text1", "text default", "", "" },
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{ "text2", "aωb", "", "" },
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{ "file1", "h\ne\n\nl\nl\no\n", "hello.txt", "text/plain" },
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{ "file2", "{\n \"world\", true\n}\n", "world.json", "application/json" },
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{ "file3", "", "", "application/octet-stream" },
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};
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auto res = cli.Post("/multipart", items);
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```
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### PUT
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```c++
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res = cli.Put("/resource/foo", "text", "text/plain");
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```
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### DELETE
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```c++
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res = cli.Delete("/resource/foo");
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```
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### OPTIONS
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```c++
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res = cli.Options("*");
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res = cli.Options("/resource/foo");
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```
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### Timeout
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```c++
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cli.set_connection_timeout(0, 300000); // 300 milliseconds
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cli.set_read_timeout(5, 0); // 5 seconds
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cli.set_write_timeout(5, 0); // 5 seconds
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```
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### Receive content with a content receiver
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|
```c++
|
|
std::string body;
|
|
|
|
auto res = cli.Get("/large-data",
|
|
[&](const char *data, size_t data_length) {
|
|
body.append(data, data_length);
|
|
return true;
|
|
});
|
|
```
|
|
|
|
```cpp
|
|
std::string body;
|
|
|
|
auto res = cli.Get(
|
|
"/stream", Headers(),
|
|
[&](const Response &response) {
|
|
EXPECT_EQ(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
|
|
|
|
```cpp
|
|
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
|
|
|
|
```cpp
|
|
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
|
|
|
|
```cpp
|
|
httplib::Client client(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
|
|
|
|
```cpp
|
|
// 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
|
|
|
|
```cpp
|
|
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
|
|
|
|
```cpp
|
|
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".
|
|
```
|
|
|
|
```cpp
|
|
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
|
|
|
|
```cpp
|
|
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
|
|
|
|
```cpp
|
|
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.
|
|
|
|
```cpp
|
|
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.
|
|
|
|
### Compress request body on client
|
|
|
|
```c++
|
|
cli.set_compress(true);
|
|
res = cli.Post("/resource/foo", "...", "text/plain");
|
|
```
|
|
|
|
### Compress response body on client
|
|
|
|
```c++
|
|
cli.set_decompress(false);
|
|
res = cli.Get("/resource/foo", {{"Accept-Encoding", "gzip, deflate, br"}});
|
|
res->body; // Compressed data
|
|
```
|
|
|
|
Split httplib.h into .h and .cc
|
|
-------------------------------
|
|
|
|
```bash
|
|
> 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](https://stackoverflow.com/questions/12530406/is-gcc-4-8-or-earlier-buggy-about-regular-expressions).
|
|
|
|
### Windows
|
|
|
|
Include `httplib.h` before `Windows.h` or include `Windows.h` by defining `WIN32_LEAN_AND_MEAN` beforehand.
|
|
|
|
```cpp
|
|
#include <httplib.h>
|
|
#include <Windows.h>
|
|
```
|
|
|
|
```cpp
|
|
#define WIN32_LEAN_AND_MEAN
|
|
#include <Windows.h>
|
|
#include <httplib.h>
|
|
```
|
|
|
|
Note: Windows 8 or lower and Cygwin on Windows are not supported.
|
|
|
|
License
|
|
-------
|
|
|
|
MIT license (© 2021 Yuji Hirose)
|
|
|
|
Special Thanks To
|
|
-----------------
|
|
|
|
[These folks](https://github.com/yhirose/cpp-httplib/graphs/contributors) made great contributions to polish this library to totally another level from a simple toy!
|