基于Boost.ASIO的HTTP客户端库(如libcurl)

我正在寻找一个现代的C++ HTTP库,因为libcurl的缺点很难被C++包装器解决.基于Boost.ASIO的解决方案已成为事实上的C++ TCP库,因此是首选.

1> Manuel..：

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前几天有人在另一个帖子上推荐了这个:

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

我认为这是你所能找到的高级别,但我不确定它是否已经足够成熟(我想说它可能是因为他们已经提议它包含Boost).

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我花了相当多的时间才发现这一点只是为了发现HTTPS还不支持.如果有的话,这显然还不成熟.

2> Vinnie Falco..：

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迟到总比没有好,这是旧问题的新答案.这是一个名为Boost.Beast的新开源库,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,并且有大量的文档.它使用bjam或CMake构建于clang,gcc和Visual Studio之上 - 您的选择!注意,我也是图书馆的作者.

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

这是一个检索网页的完整示例程序:

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 

using tcp = boost::asio::ip::tcp;       // from 
namespace http = boost::beast::http;    // from 

// 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    []\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 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 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;
}

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我加了一条便条，解释说我是作者。

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也许值得更新注意到野兽虽然在撰写本文时仍处于测试阶段,但已被接受加入Boost？参看 http://www.boost.org/doc/libs/develop/libs/beast/doc/html/beast.html恭喜作者!

3> 小智..：

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asio作者实施:

http://think-async.com/Urdl

http://sourceforge.net/projects/urdl

4> 小智..：

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您还应该查看Pion网络库:

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