| // |
| // sync_client.cpp |
| // ~~~~~~~~~~~~~~~ |
| // |
| // Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff 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) |
| // |
| |
| #include <iostream> |
| #include <istream> |
| #include <ostream> |
| #include <string> |
| #include <boost/asio.hpp> |
| |
| using boost::asio::ip::tcp; |
| |
| int main(int argc, char* argv[]) |
| { |
| try |
| { |
| if (argc != 3) |
| { |
| std::cout << "Usage: sync_client <server> <path>\n"; |
| std::cout << "Example:\n"; |
| std::cout << " sync_client www.boost.org /LICENSE_1_0.txt\n"; |
| return 1; |
| } |
| |
| boost::asio::io_service io_service; |
| |
| // Get a list of endpoints corresponding to the server name. |
| tcp::resolver resolver(io_service); |
| tcp::resolver::query query(argv[1], "http"); |
| tcp::resolver::iterator endpoint_iterator = resolver.resolve(query); |
| tcp::resolver::iterator end; |
| |
| // Try each endpoint until we successfully establish a connection. |
| tcp::socket socket(io_service); |
| boost::system::error_code error = boost::asio::error::host_not_found; |
| while (error && endpoint_iterator != end) |
| { |
| socket.close(); |
| socket.connect(*endpoint_iterator++, error); |
| } |
| if (error) |
| throw boost::system::system_error(error); |
| |
| // Form the request. We specify the "Connection: close" header so that the |
| // server will close the socket after transmitting the response. This will |
| // allow us to treat all data up until the EOF as the content. |
| boost::asio::streambuf request; |
| std::ostream request_stream(&request); |
| request_stream << "GET " << argv[2] << " HTTP/1.0\r\n"; |
| request_stream << "Host: " << argv[1] << "\r\n"; |
| request_stream << "Accept: */*\r\n"; |
| request_stream << "Connection: close\r\n\r\n"; |
| |
| // Send the request. |
| boost::asio::write(socket, request); |
| |
| // Read the response status line. The response streambuf will automatically |
| // grow to accommodate the entire line. The growth may be limited by passing |
| // a maximum size to the streambuf constructor. |
| boost::asio::streambuf response; |
| boost::asio::read_until(socket, response, "\r\n"); |
| |
| // Check that response is OK. |
| std::istream response_stream(&response); |
| std::string http_version; |
| response_stream >> http_version; |
| unsigned int status_code; |
| response_stream >> status_code; |
| std::string status_message; |
| std::getline(response_stream, status_message); |
| if (!response_stream || http_version.substr(0, 5) != "HTTP/") |
| { |
| std::cout << "Invalid response\n"; |
| return 1; |
| } |
| if (status_code != 200) |
| { |
| std::cout << "Response returned with status code " << status_code << "\n"; |
| return 1; |
| } |
| |
| // Read the response headers, which are terminated by a blank line. |
| boost::asio::read_until(socket, response, "\r\n\r\n"); |
| |
| // Process the response headers. |
| std::string header; |
| while (std::getline(response_stream, header) && header != "\r") |
| std::cout << header << "\n"; |
| std::cout << "\n"; |
| |
| // Write whatever content we already have to output. |
| if (response.size() > 0) |
| std::cout << &response; |
| |
| // Read until EOF, writing data to output as we go. |
| while (boost::asio::read(socket, response, |
| boost::asio::transfer_at_least(1), error)) |
| std::cout << &response; |
| if (error != boost::asio::error::eof) |
| throw boost::system::system_error(error); |
| } |
| catch (std::exception& e) |
| { |
| std::cout << "Exception: " << e.what() << "\n"; |
| } |
| |
| return 0; |
| } |