ceph/src/boost/libs/beast/example/http/client/sync/http_client_sync.cpp

   1 //
   2 // Copyright (c) 2016-2017 Vinnie Falco (vinnie dot falco at gmail dot com)
   3 //
   4 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   5 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 //
   7 // Official repository: https://github.com/boostorg/beast
   8 //
   9
  10 //------------------------------------------------------------------------------
  11 //
  12 // Example: HTTP client, synchronous
  13 //
  14 //------------------------------------------------------------------------------
  15
  16 //[example_http_client
  17
  18 #include <boost/beast/core.hpp>
  19 #include <boost/beast/http.hpp>
  20 #include <boost/beast/version.hpp>
  21 #include <boost/asio/connect.hpp>
  22 #include <boost/asio/ip/tcp.hpp>
  23 #include <cstdlib>
  24 #include <iostream>
  25 #include <string>
  26
  27 using tcp = boost::asio::ip::tcp;       // from <boost/asio/ip/tcp.hpp>
  28 namespace http = boost::beast::http;    // from <boost/beast/http.hpp>
  29
  30 // Performs an HTTP GET and prints the response
  31 int main(int argc, char** argv)
  32 {
  33     try
  34     {
  35         // Check command line arguments.
  36         if(argc != 4 && argc != 5)
  37         {
  38             std::cerr <<
  39                 "Usage: http-client-sync <host> <port> <target> [<HTTP version: 1.0 or 1.1(default)>]\n" <<
  40                 "Example:\n" <<
  41                 "    http-client-sync www.example.com 80 /\n" <<
  42                 "    http-client-sync www.example.com 80 / 1.0\n";
  43             return EXIT_FAILURE;
  44         }
  45         auto const host = argv[1];
  46         auto const port = argv[2];
  47         auto const target = argv[3];
  48         int version = argc == 5 && !std::strcmp("1.0", argv[4]) ? 10 : 11;
  49
  50         // The io_context is required for all I/O
  51         boost::asio::io_context ioc;
  52
  53         // These objects perform our I/O
  54         tcp::resolver resolver{ioc};
  55         tcp::socket socket{ioc};
  56
  57         // Look up the domain name
  58         auto const results = resolver.resolve(host, port);
  59
  60         // Make the connection on the IP address we get from a lookup
  61         boost::asio::connect(socket, results.begin(), results.end());
  62
  63         // Set up an HTTP GET request message
  64         http::request<http::string_body> req{http::verb::get, target, version};
  65         req.set(http::field::host, host);
  66         req.set(http::field::user_agent, BOOST_BEAST_VERSION_STRING);
  67
  68         // Send the HTTP request to the remote host
  69         http::write(socket, req);
  70
  71         // This buffer is used for reading and must be persisted
  72         boost::beast::flat_buffer buffer;
  73
  74         // Declare a container to hold the response
  75         http::response<http::dynamic_body> res;
  76
  77         // Receive the HTTP response
  78         http::read(socket, buffer, res);
  79
  80         // Write the message to standard out
  81         std::cout << res << std::endl;
  82
  83         // Gracefully close the socket
  84         boost::system::error_code ec;
  85         socket.shutdown(tcp::socket::shutdown_both, ec);
  86
  87         // not_connected happens sometimes
  88         // so don't bother reporting it.
  89         //
  90         if(ec && ec != boost::system::errc::not_connected)
  91             throw boost::system::system_error{ec};
  92
  93         // If we get here then the connection is closed gracefully
  94     }
  95     catch(std::exception const& e)
  96     {
  97         std::cerr << "Error: " << e.what() << std::endl;
  98         return EXIT_FAILURE;
  99     }
 100     return EXIT_SUCCESS;
 101 }
 102
 103 //]