ceph/src/boost/libs/asio/example/cpp03/http/client/sync_client.cpp

   1 //
   2 // sync_client.cpp
   3 // ~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2016 Christopher M. Kohlhoff (chris at kohlhoff dot com)
   6 //
   7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   9 //
  10
  11 #include <iostream>
  12 #include <istream>
  13 #include <ostream>
  14 #include <string>
  15 #include <boost/asio.hpp>
  16
  17 using boost::asio::ip::tcp;
  18
  19 int main(int argc, char* argv[])
  20 {
  21   try
  22   {
  23     if (argc != 3)
  24     {
  25       std::cout << "Usage: sync_client <server> <path>\n";
  26       std::cout << "Example:\n";
  27       std::cout << "  sync_client www.boost.org /LICENSE_1_0.txt\n";
  28       return 1;
  29     }
  30
  31     boost::asio::io_service io_service;
  32
  33     // Get a list of endpoints corresponding to the server name.
  34     tcp::resolver resolver(io_service);
  35     tcp::resolver::query query(argv[1], "http");
  36     tcp::resolver::iterator endpoint_iterator = resolver.resolve(query);
  37
  38     // Try each endpoint until we successfully establish a connection.
  39     tcp::socket socket(io_service);
  40     boost::asio::connect(socket, endpoint_iterator);
  41
  42     // Form the request. We specify the "Connection: close" header so that the
  43     // server will close the socket after transmitting the response. This will
  44     // allow us to treat all data up until the EOF as the content.
  45     boost::asio::streambuf request;
  46     std::ostream request_stream(&request);
  47     request_stream << "GET " << argv[2] << " HTTP/1.0\r\n";
  48     request_stream << "Host: " << argv[1] << "\r\n";
  49     request_stream << "Accept: */*\r\n";
  50     request_stream << "Connection: close\r\n\r\n";
  51
  52     // Send the request.
  53     boost::asio::write(socket, request);
  54
  55     // Read the response status line. The response streambuf will automatically
  56     // grow to accommodate the entire line. The growth may be limited by passing
  57     // a maximum size to the streambuf constructor.
  58     boost::asio::streambuf response;
  59     boost::asio::read_until(socket, response, "\r\n");
  60
  61     // Check that response is OK.
  62     std::istream response_stream(&response);
  63     std::string http_version;
  64     response_stream >> http_version;
  65     unsigned int status_code;
  66     response_stream >> status_code;
  67     std::string status_message;
  68     std::getline(response_stream, status_message);
  69     if (!response_stream || http_version.substr(0, 5) != "HTTP/")
  70     {
  71       std::cout << "Invalid response\n";
  72       return 1;
  73     }
  74     if (status_code != 200)
  75     {
  76       std::cout << "Response returned with status code " << status_code << "\n";
  77       return 1;
  78     }
  79
  80     // Read the response headers, which are terminated by a blank line.
  81     boost::asio::read_until(socket, response, "\r\n\r\n");
  82
  83     // Process the response headers.
  84     std::string header;
  85     while (std::getline(response_stream, header) && header != "\r")
  86       std::cout << header << "\n";
  87     std::cout << "\n";
  88
  89     // Write whatever content we already have to output.
  90     if (response.size() > 0)
  91       std::cout << &response;
  92
  93     // Read until EOF, writing data to output as we go.
  94     boost::system::error_code error;
  95     while (boost::asio::read(socket, response,
  96           boost::asio::transfer_at_least(1), error))
  97       std::cout << &response;
  98     if (error != boost::asio::error::eof)
  99       throw boost::system::system_error(error);
 100   }
 101   catch (std::exception& e)
 102   {
 103     std::cout << "Exception: " << e.what() << "\n";
 104   }
 105
 106   return 0;
 107 }