C++ REST SDK(casablanca):如何获取连接到http_listener的客户端的地址？

Question

我有一个用Casablanca编写的小型HTTP服务器,我想获得发送请求的客户端的IP地址.我查看了http_request的成员,但找不到它.

web::http::experimental::listener::http_listener listener(U("http://*/http_server"));

listener.support(web::http::methods::POST, [](web::http::http_request const& request)
{
    std::cout << "client: " << "[ip address]" << " requested " << request << std::endl;
});