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

   1 //
   2 // Copyright (c) 2016-2019 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 namespace beast = boost::beast;     // from <boost/beast.hpp>
  28 namespace http = beast::http;       // from <boost/beast/http.hpp>
  29 namespace net = boost::asio;        // from <boost/asio.hpp>
  30 using tcp = net::ip::tcp;           // from <boost/asio/ip/tcp.hpp>
  31
  32 // Performs an HTTP GET and prints the response
  33 int main(int argc, char** argv)
  34 {
  35     try
  36     {
  37         // Check command line arguments.
  38         if(argc != 4 && argc != 5)
  39         {
  40             std::cerr <<
  41                 "Usage: http-client-sync <host> <port> <target> [<HTTP version: 1.0 or 1.1(default)>]\n" <<
  42                 "Example:\n" <<
  43                 "    http-client-sync www.example.com 80 /\n" <<
  44                 "    http-client-sync www.example.com 80 / 1.0\n";
  45             return EXIT_FAILURE;
  46         }
  47         auto const host = argv[1];
  48         auto const port = argv[2];
  49         auto const target = argv[3];
  50         int version = argc == 5 && !std::strcmp("1.0", argv[4]) ? 10 : 11;
  51
  52         // The io_context is required for all I/O
  53         net::io_context ioc;
  54
  55         // These objects perform our I/O
  56         tcp::resolver resolver(ioc);
  57         beast::tcp_stream stream(ioc);
  58
  59         // Look up the domain name
  60         auto const results = resolver.resolve(host, port);
  61
  62         // Make the connection on the IP address we get from a lookup
  63         stream.connect(results);
  64
  65         // Set up an HTTP GET request message
  66         http::request<http::string_body> req{http::verb::get, target, version};
  67         req.set(http::field::host, host);
  68         req.set(http::field::user_agent, BOOST_BEAST_VERSION_STRING);
  69
  70         // Send the HTTP request to the remote host
  71         http::write(stream, req);
  72
  73         // This buffer is used for reading and must be persisted
  74         beast::flat_buffer buffer;
  75
  76         // Declare a container to hold the response
  77         http::response<http::dynamic_body> res;
  78
  79         // Receive the HTTP response
  80         http::read(stream, buffer, res);
  81
  82         // Write the message to standard out
  83         std::cout << res << std::endl;
  84
  85         // Gracefully close the socket
  86         beast::error_code ec;
  87         stream.socket().shutdown(tcp::socket::shutdown_both, ec);
  88
  89         // not_connected happens sometimes
  90         // so don't bother reporting it.
  91         //
  92         if(ec && ec != beast::errc::not_connected)
  93             throw beast::system_error{ec};
  94
  95         // If we get here then the connection is closed gracefully
  96     }
  97     catch(std::exception const& e)
  98     {
  99         std::cerr << "Error: " << e.what() << std::endl;
 100         return EXIT_FAILURE;
 101     }
 102     return EXIT_SUCCESS;
 103 }
 104
 105 //]