forked from boostorg/beast
106 lines
3.3 KiB
C++
106 lines
3.3 KiB
C++
//
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// Copyright (c) 2016-2017 Vinnie Falco (vinnie dot falco at gmail dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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// Official repository: https://github.com/boostorg/beast
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//
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//------------------------------------------------------------------------------
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//
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// Example: HTTP client, synchronous
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//
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//------------------------------------------------------------------------------
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//[example_http_client
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#include <boost/beast/core.hpp>
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#include <boost/beast/http.hpp>
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#include <boost/beast/version.hpp>
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#include <boost/asio/connect.hpp>
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#include <boost/asio/ip/tcp.hpp>
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#include <cstdlib>
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#include <iostream>
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#include <string>
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namespace beast = boost::beast; // from <boost/beast.hpp>
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namespace http = beast::http; // from <boost/beast/http.hpp>
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namespace net = boost::asio; // from <boost/asio.hpp>
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using tcp = net::ip::tcp; // from <boost/asio/ip/tcp.hpp>
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// Performs an HTTP GET and prints the response
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int main(int argc, char** argv)
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{
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try
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{
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// Check command line arguments.
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if(argc != 4 && argc != 5)
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{
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std::cerr <<
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"Usage: http-client-sync <host> <port> <target> [<HTTP version: 1.0 or 1.1(default)>]\n" <<
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"Example:\n" <<
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" http-client-sync www.example.com 80 /\n" <<
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" http-client-sync www.example.com 80 / 1.0\n";
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return EXIT_FAILURE;
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}
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auto const host = argv[1];
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auto const port = argv[2];
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auto const target = argv[3];
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int version = argc == 5 && !std::strcmp("1.0", argv[4]) ? 10 : 11;
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// The io_context is required for all I/O
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net::io_context ioc;
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// These objects perform our I/O
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tcp::resolver resolver{ioc};
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tcp::socket socket{ioc};
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// Look up the domain name
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auto const results = resolver.resolve(host, port);
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// Make the connection on the IP address we get from a lookup
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net::connect(socket, results.begin(), results.end());
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// Set up an HTTP GET request message
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http::request<http::string_body> req{http::verb::get, target, version};
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req.set(http::field::host, host);
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req.set(http::field::user_agent, BOOST_BEAST_VERSION_STRING);
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// Send the HTTP request to the remote host
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http::write(socket, req);
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// This buffer is used for reading and must be persisted
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beast::flat_buffer buffer;
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// Declare a container to hold the response
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http::response<http::dynamic_body> res;
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// Receive the HTTP response
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http::read(socket, buffer, res);
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// Write the message to standard out
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std::cout << res << std::endl;
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// Gracefully close the socket
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beast::error_code ec;
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socket.shutdown(tcp::socket::shutdown_both, ec);
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// not_connected happens sometimes
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// so don't bother reporting it.
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//
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if(ec && ec != beast::errc::not_connected)
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throw beast::system_error{ec};
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// If we get here then the connection is closed gracefully
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}
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catch(std::exception const& e)
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{
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std::cerr << "Error: " << e.what() << std::endl;
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return EXIT_FAILURE;
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}
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return EXIT_SUCCESS;
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}
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//]
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