| // |
| // http_client.cpp |
| // ~~~~~~~~~~~~~~~ |
| // |
| // Copyright (c) 2003-2021 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 <asio/ts/internet.hpp> |
| |
| using 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; |
| } |
| |
| 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(std::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; |
| } |