504 gateway timeouts

[Zhang Chao]

> The version that is on the ubuntu servers was 1.10.xx. I just updated it
to
>
> nginx version: nginx/1.13.8
>
> And I am still having the same issue.
>
> How do I "Try to flush out some output early on so that nginx will know
that Tomcat is alive."
>
> The nginx and tomcat connection is working fine for all
requests/responses that take less t

Maybe you can flush out the HTTP response headers quickly.
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