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- //
- // Copyright (c) 2016-2019 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, synchronous
- //
- //------------------------------------------------------------------------------
- //[example_http_client
- #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 <iostream>
- #include <string>
- namespace beast = boost::beast; // from <boost/beast.hpp>
- namespace http = beast::http; // from <boost/beast/http.hpp>
- namespace net = boost::asio; // from <boost/asio.hpp>
- using tcp = net::ip::tcp; // from <boost/asio/ip/tcp.hpp>
- // Performs an HTTP GET and prints the response
- int main(int argc, char** argv)
- {
- try
- {
- // Check command line arguments.
- if(argc != 4 && argc != 5)
- {
- std::cerr <<
- "Usage: http-client-sync <host> <port> <target> [<HTTP version: 1.0 or 1.1(default)>]\n" <<
- "Example:\n" <<
- " http-client-sync www.example.com 80 /\n" <<
- " http-client-sync 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
- net::io_context ioc;
- // These objects perform our I/O
- tcp::resolver resolver(ioc);
- beast::tcp_stream stream(ioc);
- // Look up the domain name
- auto const results = resolver.resolve(host, port);
- // Make the connection on the IP address we get from a lookup
- stream.connect(results);
- // Set up an HTTP GET request message
- http::request<http::string_body> req{http::verb::get, target, version};
- req.set(http::field::host, host);
- req.set(http::field::user_agent, BOOST_BEAST_VERSION_STRING);
- // Send the HTTP request to the remote host
- http::write(stream, req);
- // This buffer is used for reading and must be persisted
- beast::flat_buffer buffer;
- // Declare a container to hold the response
- http::response<http::dynamic_body> res;
- // Receive the HTTP response
- http::read(stream, buffer, res);
- // Write the message to standard out
- std::cout << res << std::endl;
- // Gracefully close the socket
- beast::error_code ec;
- stream.socket().shutdown(tcp::socket::shutdown_both, ec);
- // not_connected happens sometimes
- // so don't bother reporting it.
- //
- if(ec && ec != beast::errc::not_connected)
- throw beast::system_error{ec};
- // If we get here then the connection is closed gracefully
- }
- catch(std::exception const& e)
- {
- std::cerr << "Error: " << e.what() << std::endl;
- return EXIT_FAILURE;
- }
- return EXIT_SUCCESS;
- }
- //]
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