Hi,
Thanks for the reply!

So, if there is no error and the downstream/upstream didn't actively close the connection, the nginx won't timeout and close the tcp connection with the downstream or with the upstream at all? is that correct? and I suppose the SO_KEEPALIVE option is turn on by default on connection sockets, right?

The "session" refers to the ngx_stream_session_t in the source code, I want to know if the tcp load balance (select upstream) is triggered just once per "session" just like http does with ngx_http_request_t?


Regards,
Allen