nginx has problem sending request body to upstream

[allenhe]

I see. so in this case the request was completely sent in single write
without blocking that there is no need to schedule a write timer anymore,
otherwise it is necessary. 
Thanks for the explanations!

b.t.w, have you ever seen the work process is listening on the socket?

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,283735,283855#msg-283855