boost socket 最直接有效地设定ip和port的代码……

tcp::endpoint end_p(boost::asio::ip::address_v4::from_string("127.0.0.1"), target_port);
        tcp::endpoint end_point(boost::asio::ip::address_v4::from_string("127.0.0.1"), 974);
        client_proxy_socket.open(end_point.protocol());
        client_proxy_socket.bind(end_point);
        client_proxy_socket.connect(end_p);
        boost::asio::write(client_proxy_socket, req.header_to_buffers());