>>client prematurely closed connection
that means your client has closed the socket.

You can rebuilt the nginx to enable the detailed logging for debug
http://nginx.org/en/docs/debugging_log.html

2015-10-21 15:52 GMT+08:00 Pauls V <nginx-forum@nginx.us>:

> Had tried with reload and that didn't change output. Tried restarting Nginx
> and that actually enabled the logging.
>
> If someone is wondering then this is what I see in log now:
> ... client prematurely closed connection ...
>
> Thanks,
> Pauls
>
> Posted at Nginx Forum:
> https://forum.nginx.org/read.php?2,262308,262385#msg-262385
>
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