基于boost.asio的HTTP客户端库(如libcurl)[关闭]

前几天有人推荐这个 another thread 以下内容:

http://cpp-netlib.github.com/

我认为这和你会发现的一样高层次,但我不确定它是否足够成熟(我会说这可能是因为他们已经提出了促进包容性)。

迟做总比不做好,这是一个旧问题的新答案。有一个新的开源库,叫做boost.beast,它使用boost.asio提供HTTP和WebSocket功能。它尽可能地模拟熟悉的ASIO接口,并获得大量文档。它基于clang、gcc和Visual Studio,使用bjam或cmake—您的选择!注意,我也是图书馆的作者。

https://github.com/boostorg/beast/

以下是检索网页的完整示例程序:

#include <boost/beast/core.hpp>
#include <boost/beast/http.hpp>
#include <boost/beast/version.hpp>
#include <boost/asio/connect.hpp>
#include <boost/asio/ip/tcp.hpp>
#include <cstdlib>
#include <iostream>
#include <string>

using tcp = boost::asio::ip::tcp;       // from <boost/asio/ip/tcp.hpp>
namespace http = boost::beast::http;    // from <boost/beast/http.hpp>

// Performs an HTTP GET and prints the response
int main(int argc, char** argv)
{
    try
    {
        // Check command line arguments.
        if(argc != 4 && argc != 5)
        {
            std::cerr <<
                "Usage: http-client-sync <host> <port> <target> [<HTTP version: 1.0 or 1.1(default)>]\n" <<
                "Example:\n" <<
                "    http-client-sync www.example.com 80 /\n" <<
                "    http-client-sync www.example.com 80 / 1.0\n";
            return EXIT_FAILURE;
        }
        auto const host = argv[1];
        auto const port = argv[2];
        auto const target = argv[3];
        int version = argc == 5 && !std::strcmp("1.0", argv[4]) ? 10 : 11;

        // The io_context is required for all I/O
        boost::asio::io_context ioc;

        // These objects perform our I/O
        tcp::resolver resolver{ioc};
        tcp::socket socket{ioc};

        // Look up the domain name
        auto const results = resolver.resolve(host, port);

        // Make the connection on the IP address we get from a lookup
        boost::asio::connect(socket, results.begin(), results.end());

        // Set up an HTTP GET request message
        http::request<http::string_body> req{http::verb::get, target, version};
        req.set(http::field::host, host);
        req.set(http::field::user_agent, BOOST_BEAST_VERSION_STRING);

        // Send the HTTP request to the remote host
        http::write(socket, req);

        // This buffer is used for reading and must be persisted
        boost::beast::flat_buffer buffer;

        // Declare a container to hold the response
        http::response<http::dynamic_body> res;

        // Receive the HTTP response
        http::read(socket, buffer, res);

        // Write the message to standard out
        std::cout << res << std::endl;

        // Gracefully close the socket
        boost::system::error_code ec;
        socket.shutdown(tcp::socket::shutdown_both, ec);

        // not_connected happens sometimes
        // so don't bother reporting it.
        //
        if(ec && ec != boost::system::errc::not_connected)
            throw boost::system::system_error{ec};

        // If we get here then the connection is closed gracefully
    }
    catch(std::exception const& e)
    {
        std::cerr << "Error: " << e.what() << std::endl;
        return EXIT_FAILURE;
    }
    return EXIT_SUCCESS;
}

ASIO作者实现:

• http://think-async.com/Urdl
• http://sourceforge.net/projects/urdl

您还应该查看PION网络库:

http://pion.org/projects/pion-network-library

boost.http-这里有一个新玩家: https://github.com/BoostGSoC14/boost.http 博士 http://boostgsoc14.github.io/boost.http/

有个项目试图“增强”libcurl: https://github.com/breese/trial.url

我将使用它作为design boost.http客户机API的参考。但是,我计划将重点放在高级抽象上,并尽量与beast.http作者协作。