如何用asio创建一个httpfangkezstueducn6007apiWeChatSendWeChatMessage的HTTP POST请求并且接受返回的数据

以下是使用asio创建HTTP POST请求的示例代码：

#include <iostream>
#include <boost/asio.hpp>

using boost::asio::ip::tcp;

int main()
{
    boost::asio::io_service io_service;

    //建立socket连接
    tcp::resolver resolver(io_service);
    tcp::resolver::query query("fangke.zstu.edu.cn", "6007");
    tcp::resolver::iterator endpoint_iterator = resolver.resolve(query);
    tcp::socket socket(io_service);
    boost::asio::connect(socket, endpoint_iterator);

    //构建HTTP POST请求
    boost::asio::streambuf request;
    std::ostream request_stream(&request);
    request_stream << "POST /api/WeChat/SendWeChatMessage HTTP/1.1\r\n";
    request_stream << "Host: fangke.zstu.edu.cn:6007\r\n";
    request_stream << "Content-Type: application/json\r\n";
    request_stream << "Content-Length: " << json_message.length() << "\r\n";
    request_stream << "Connection: close\r\n\r\n";
    request_stream << json_message;

    //发送HTTP POST请求
    boost::asio::write(socket, request);

    //读取服务器返回的数据
    boost::asio::streambuf response;
    boost::asio::read_until(socket, response, "\r\n");

    //输出服务器返回的HTTP头信息
    std::istream response_stream(&response);
    std::string http_version;
    response_stream >> http_version;
    unsigned int status_code;
    response_stream >> status_code;
    std::string status_message;
    std::getline(response_stream, status_message);
    if (!response_stream || 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;
    }
    boost::asio::read_until(socket, response, "\r\n\r\n");

    //输出服务器返回的HTTP body信息
    std::string header;
    while (std::getline(response_stream, header) && header != "\r")
        std::cout << header << "\n";
    std::cout << "\n";
    if (response.size() > 0)
        std::cout << &response;

    return 0;
}

其中，json_message是需要发送到服务器的json格式数据，可以根据具体需求修改。在上述代码中，使用boost::asio::streambuf来构建HTTP请求，并且使用boost::asio::write()发送请求。在接收服务器返回的数据时，先读取HTTP头信息，然后再读取HTTP body信息。最后，将HTTP body信息输出到控制台。