Beast
//
// Copyright (c) 2016-2017 Vinnie Falco (vinnie dot falco at gmail dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// Official repository: https://github.com/boostorg/beast
//
//------------------------------------------------------------------------------
//
// Example: HTTP client, asynchronous
//
//------------------------------------------------------------------------------
#include <boost/beast/core.hpp>
#include <boost/beast/http.hpp>
#include <boost/beast/version.hpp>
#include <boost/asio/connect.hpp>
#include <boost/asio/ip/tcp.hpp>
#include <cstdlib>
#include <functional>
#include <iostream>
#include <memory>
#include <string>
using tcp = boost::asio::ip::tcp; // from <boost/asio/ip/tcp.hpp>
namespace http = boost::beast::http; // from <boost/beast/http.hpp>
//------------------------------------------------------------------------------
// Report a failure
void
fail(boost::system::error_code ec, char const* what)
{
std::cerr << what << ": " << ec.message() << "\n";
}
// Performs an HTTP GET and prints the response
class session : public std::enable_shared_from_this<session>
{
tcp::resolver resolver_;
tcp::socket socket_;
boost::beast::flat_buffer buffer_; // (Must persist between reads)
http::request<http::empty_body> req_;
http::response<http::string_body> res_;
public:
// Resolver and socket require an io_context
explicit
session(boost::asio::io_context& ioc)
: resolver_(ioc)
, socket_(ioc)
{
}
// Start the asynchronous operation
void
run(
char const* host,
char const* port,
char const* target,
int version)
{
// Set up an HTTP GET request message
req_.version(version);
req_.method(http::verb::get);
req_.target(target);
req_.set(http::field::host, host);
req_.set(http::field::user_agent, BOOST_BEAST_VERSION_STRING);
// Look up the domain name
resolver_.async_resolve(
host,
port,
std::bind(
&session::on_resolve,
shared_from_this(),
std::placeholders::_1,
std::placeholders::_2));
}
void
on_resolve(
boost::system::error_code ec,
tcp::resolver::results_type results)
{
if(ec)
return fail(ec, "resolve");
// Make the connection on the IP address we get from a lookup
boost::asio::async_connect(
socket_,
results.begin(),
results.end(),
std::bind(
&session::on_connect,
shared_from_this(),
std::placeholders::_1));
}
void
on_connect(boost::system::error_code ec)
{
if(ec)
return fail(ec, "connect");
// Send the HTTP request to the remote host
http::async_write(socket_, req_,
std::bind(
&session::on_write,
shared_from_this(),
std::placeholders::_1,
std::placeholders::_2));
}
void
on_write(
boost::system::error_code ec,
std::size_t bytes_transferred)
{
boost::ignore_unused(bytes_transferred);
if(ec)
return fail(ec, "write");
// Receive the HTTP response
http::async_read(socket_, buffer_, res_,
std::bind(
&session::on_read,
shared_from_this(),
std::placeholders::_1,
std::placeholders::_2));
}
void
on_read(
boost::system::error_code ec,
std::size_t bytes_transferred)
{
boost::ignore_unused(bytes_transferred);
if(ec)
return fail(ec, "read");
// Write the message to standard out
std::cout << res_ << std::endl;
// Gracefully close the socket
socket_.shutdown(tcp::socket::shutdown_both, ec);
// not_connected happens sometimes so don't bother reporting it.
if(ec && ec != boost::system::errc::not_connected)
return fail(ec, "shutdown");
// If we get here then the connection is closed gracefully
}
};
//------------------------------------------------------------------------------
int main(int argc, char** argv)
{
// Check command line arguments.
if(argc != 4 && argc != 5)
{
std::cerr <<
"Usage: http-client-async <host> <port> <target> [<HTTP version: 1.0 or 1.1(default)>]\n" <<
"Example:\n" <<
" http-client-async www.example.com 80 /\n" <<
" http-client-async www.example.com 80 / 1.0\n";
return EXIT_FAILURE;
}
auto const host = argv[1];
auto const port = argv[2];
auto const target = argv[3];
int version = argc == 5 && !std::strcmp("1.0", argv[4]) ? 10 : 11;
// The io_context is required for all I/O
boost::asio::io_context ioc;
// Launch the asynchronous operation
std::make_shared<session>(ioc)->run(host, port, target, version);
// Run the I/O service. The call will return when
// the get operation is complete.
ioc.run();
return EXIT_SUCCESS;
}
You might set content-type, body.
req_.set(http::field::content_type, "application/json");
req_.body() = R"({"name":"ksoo"})";
req_.prepare_payload();
beast-websocket example
//
// Copyright (c) 2016-2017 Vinnie Falco (vinnie dot falco at gmail dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// Official repository: https://github.com/boostorg/beast
//
//------------------------------------------------------------------------------
//
// Example: WebSocket client, asynchronous
//
//------------------------------------------------------------------------------
#include <boost/beast/core.hpp>
#include <boost/beast/websocket.hpp>
#include <boost/asio/connect.hpp>
#include <boost/asio/ip/tcp.hpp>
#include <cstdlib>
#include <functional>
#include <iostream>
#include <memory>
#include <string>
using tcp = boost::asio::ip::tcp; // from <boost/asio/ip/tcp.hpp>
namespace websocket = boost::beast::websocket; // from <boost/beast/websocket.hpp>
//------------------------------------------------------------------------------
// Report a failure
void
fail(boost::system::error_code ec, char const* what)
{
std::cerr << what << ": " << ec.message() << "\n";
}
// Sends a WebSocket message and prints the response
class session : public std::enable_shared_from_this<session>
{
tcp::resolver resolver_;
websocket::stream<tcp::socket> ws_;
boost::beast::multi_buffer buffer_;
std::string host_;
std::string text_;
public:
// Resolver and socket require an io_context
explicit
session(boost::asio::io_context& ioc)
: resolver_(ioc)
, ws_(ioc)
{
}
// Start the asynchronous operation
void
run(
char const* host,
char const* port,
char const* text)
{
// Save these for later
host_ = host;
text_ = text;
// Look up the domain name
resolver_.async_resolve(
host,
port,
std::bind(
&session::on_resolve,
shared_from_this(),
std::placeholders::_1,
std::placeholders::_2));
}
void
on_resolve(
boost::system::error_code ec,
tcp::resolver::results_type results)
{
if(ec)
return fail(ec, "resolve");
// Make the connection on the IP address we get from a lookup
boost::asio::async_connect(
ws_.next_layer(),
results.begin(),
results.end(),
std::bind(
&session::on_connect,
shared_from_this(),
std::placeholders::_1));
}
void
on_connect(boost::system::error_code ec)
{
if(ec)
return fail(ec, "connect");
// Perform the websocket handshake
ws_.async_handshake(host_, "/",
std::bind(
&session::on_handshake,
shared_from_this(),
std::placeholders::_1));
}
void
on_handshake(boost::system::error_code ec)
{
if(ec)
return fail(ec, "handshake");
// Send the message
ws_.async_write(
boost::asio::buffer(text_),
std::bind(
&session::on_write,
shared_from_this(),
std::placeholders::_1,
std::placeholders::_2));
}
void
on_write(
boost::system::error_code ec,
std::size_t bytes_transferred)
{
boost::ignore_unused(bytes_transferred);
if(ec)
return fail(ec, "write");
// Read a message into our buffer
ws_.async_read(
buffer_,
std::bind(
&session::on_read,
shared_from_this(),
std::placeholders::_1,
std::placeholders::_2));
}
void
on_read(
boost::system::error_code ec,
std::size_t bytes_transferred)
{
boost::ignore_unused(bytes_transferred);
if(ec)
return fail(ec, "read");
// Close the WebSocket connection
ws_.async_close(websocket::close_code::normal,
std::bind(
&session::on_close,
shared_from_this(),
std::placeholders::_1));
}
void
on_close(boost::system::error_code ec)
{
if(ec)
return fail(ec, "close");
// If we get here then the connection is closed gracefully
// The buffers() function helps print a ConstBufferSequence
std::cout << boost::beast::buffers(buffer_.data()) << std::endl;
}
};
//------------------------------------------------------------------------------
int main(int argc, char** argv)
{
// Check command line arguments.
if(argc != 4)
{
std::cerr <<
"Usage: websocket-client-async <host> <port> <text>\n" <<
"Example:\n" <<
" websocket-client-async echo.websocket.org 80 \"Hello, world!\"\n";
return EXIT_FAILURE;
}
auto const host = argv[1];
auto const port = argv[2];
auto const text = argv[3];
// The io_context is required for all I/O
boost::asio::io_context ioc;
// Launch the asynchronous operation
std::make_shared<session>(ioc)->run(host, port, text);
// Run the I/O service. The call will return when
// the socket is closed.
ioc.run();
return EXIT_SUCCESS;
}
You can set custom header when beast try handshake. (onConnect)
ws_.async_handshake_ex("example.com", "/",
[](websocket::request_type& req)
{
req.set(http::field::user_agent, "Beast");
req.insert("custome-header", "header :-)");
},
std::bind(
&session::on_handshake,
shared_from_this(),
std::placeholders::_1)
);