代理使用Socket时有个小问题 || There is a small problem with the proxy using Socket

[ruyantingting]

当使用CONNECT要求打开一个连接时，会正常返回200，但连接没有打开，HttpProxyServerHandler里必须读到8个byte，当发送数据少于8个时会卡在那里，而且不是建立连接后再返回200的

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When using CONNECT to open a connection, it will return 200 normally, but the connection is not opened. 8 bytes must be read in HttpProxyServerHandler. When there are less than 8 data sent, it will be stuck there, and it will not return 200 after establishing the connection.