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HTTP 代理服务器检测 HTTP 客户端断开
原标题:HTTP proxy detecting HTTP client disconnection

I m new to HTTP, and developing an applicative proxy. I want to avoid defining timeouts for operations, and instead rely on the the client to close the connection. I m wondering if this is possible?

这里有一个非常哑哑的假代码

void handle_request(Request http_request, Response http_response)
{
   string modified_request = parse(http_request);
   response_from_server = remote_server->send_request(modified_request);
   while(true) {
     if(response_from_server ->wait_for_data(1000 /* milliseconds */)) {
       http_response->write_data(response_from_server->read_data());
       continue;
     }

     if(!http_response.check_if_the_client_connection_to_me_is_still_active()) // how to do this?
         return;
     }
   }
}

另一种问法是:

  1. in an HTTP proxy, can I use the timeouts from the remote cilent and the remote server without adding yet another timeout?
  2. how do I detect that either the remote server or remote client have timed-out?

顺便说一句,我在C++使用Poco开发。

最佳回答

不能在不使用超时的情况下写入一个严重的 TCP 应用程序 。 在某些情况下, 它们是唯一的方法, 您可以在读取时检测到一个已下降的连接 。 TCP 提供了以下方法来检测已下降的连接 :

  1. The various EOS conditions on read.
  2. Connection reset on write or occasionally read.
  3. Read timeout.

就是这样 已经没有了

您也应该让 TCP 保持自 己的状态, 但只有两个小时后才能恢复。

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