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- //
- // http_client.cpp
- // ~~~~~~~~~~~~~~~
- //
- // Copyright (c) 2003-2019 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/ip/tcp.hpp>
- using boost::asio::ip::tcp;
- int main(int argc, char* argv[])
- {
- try
- {
- if (argc != 3)
- {
- std::cout << "Usage: http_client <server> <path>\n";
- std::cout << "Example:\n";
- std::cout << " http_client www.boost.org /LICENSE_1_0.txt\n";
- return 1;
- }
- boost::asio::ip::tcp::iostream s;
- // The entire sequence of I/O operations must complete within 60 seconds.
- // If an expiry occurs, the socket is automatically closed and the stream
- // becomes bad.
- s.expires_after(boost::asio::chrono::seconds(60));
- // Establish a connection to the server.
- s.connect(argv[1], "http");
- if (!s)
- {
- std::cout << "Unable to connect: " << s.error().message() << "\n";
- return 1;
- }
- // Send 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.
- s << "GET " << argv[2] << " HTTP/1.0\r\n";
- s << "Host: " << argv[1] << "\r\n";
- s << "Accept: */*\r\n";
- s << "Connection: close\r\n\r\n";
- // By default, the stream is tied with itself. This means that the stream
- // automatically flush the buffered output before attempting a read. It is
- // not necessary not explicitly flush the stream at this point.
- // Check that response is OK.
- std::string http_version;
- s >> http_version;
- unsigned int status_code;
- s >> status_code;
- std::string status_message;
- std::getline(s, status_message);
- if (!s || 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;
- }
- // Process the response headers, which are terminated by a blank line.
- std::string header;
- while (std::getline(s, header) && header != "\r")
- std::cout << header << "\n";
- std::cout << "\n";
- // Write the remaining data to output.
- std::cout << s.rdbuf();
- }
- catch (std::exception& e)
- {
- std::cout << "Exception: " << e.what() << "\n";
- }
- return 0;
- }
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