在服务端主动关闭连接的时候，会出现问题 || Problems may occur when the server actively closes the connection.

[poetic-edge]

在代理访问某些网站的时候，网站的服务端会主动关闭连接，就会导致页面刷新异常。
建议在这个文件里添加对HttpProxyServerHandler.java添加对getChannelFuture()主动断开的处理。

（为啥不主动提PR，因为java写的很少，怕给你添乱了）

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When the proxy accesses certain websites, the server of the website will actively close the connection, which will cause the page to refresh abnormally.
It is recommended to add [HttpProxyServerHandler.java](https://github.com/monkeyWie/proxyee/blob/master/src/main/java/com/github/monkeywie/proxyee/handler/HttpProxyServerHandler.java#L349 to this file ) Add processing for active disconnection of getChannelFuture().

(Why don't you take the initiative to submit a PR? Because I write very little Java, I'm afraid it will cause trouble for you)