92 lines
2.5 KiB
C++
92 lines
2.5 KiB
C++
//
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// http_client.cpp
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// ~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#include <iostream>
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#include <istream>
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#include <ostream>
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#include <string>
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#include <boost/asio/ip/tcp.hpp>
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using boost::asio::ip::tcp;
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int main(int argc, char* argv[])
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{
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try
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{
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if (argc != 3)
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{
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std::cout << "Usage: http_client <server> <path>\n";
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std::cout << "Example:\n";
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std::cout << " http_client www.boost.org /LICENSE_1_0.txt\n";
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return 1;
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}
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boost::asio::ip::tcp::iostream s;
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// The entire sequence of I/O operations must complete within 60 seconds.
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// If an expiry occurs, the socket is automatically closed and the stream
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// becomes bad.
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s.expires_after(boost::asio::chrono::seconds(60));
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// Establish a connection to the server.
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s.connect(argv[1], "http");
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if (!s)
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{
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std::cout << "Unable to connect: " << s.error().message() << "\n";
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return 1;
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}
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// Send the request. We specify the "Connection: close" header so that the
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// server will close the socket after transmitting the response. This will
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// allow us to treat all data up until the EOF as the content.
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s << "GET " << argv[2] << " HTTP/1.0\r\n";
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s << "Host: " << argv[1] << "\r\n";
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s << "Accept: */*\r\n";
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s << "Connection: close\r\n\r\n";
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// By default, the stream is tied with itself. This means that the stream
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// automatically flush the buffered output before attempting a read. It is
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// not necessary not explicitly flush the stream at this point.
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// Check that response is OK.
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std::string http_version;
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s >> http_version;
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unsigned int status_code;
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s >> status_code;
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std::string status_message;
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std::getline(s, status_message);
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if (!s || http_version.substr(0, 5) != "HTTP/")
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{
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std::cout << "Invalid response\n";
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return 1;
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}
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if (status_code != 200)
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{
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std::cout << "Response returned with status code " << status_code << "\n";
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return 1;
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}
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// Process the response headers, which are terminated by a blank line.
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std::string header;
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while (std::getline(s, header) && header != "\r")
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std::cout << header << "\n";
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std::cout << "\n";
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// Write the remaining data to output.
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std::cout << s.rdbuf();
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}
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catch (std::exception& e)
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{
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std::cout << "Exception: " << e.what() << "\n";
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}
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return 0;
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}
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