nginx uwsgi connection timeout

[Maxim Dounin]

Hello!

On Fri, Nov 07, 2014 at 05:52:31PM -0500, jpherbst wrote:

> Hello,
> 
> I have nginx 1.6.1 setup in front of uwsgi 2.0.7 using uwsgi_pass, which has
> been working very well for me except for one request.  When I make the
> failing request uwsgi processes the request and returns the response in less
> than a second, but nginx just sits there with an open connection to uwsgi
> eventually timing out after 60 seconds as if uwsgi did not send back a
> complete request.  I have many other pages hosted on this server all of
> which work just fine, both post and get requests.  The one difference I have
> noticed about this request is that the response is very small, 14 bytes of
> json.  I have tried using both chunked and not chunked (with content-length
> header) encoding, they both yield the same result.  I tried adding
> "uwsgi_buffering off;" to my configuration, this allowed the request to
> complete, but the next request hangs because nginx doesn't think the
> previous request is finished and I only have one uwsgi worker.
> 
> Does anyone have any ideas about what could cause this?

In the uwsgi protocol, end of a response is signalled by closing a 
connection.  Are connections properly closed by your backend?

See also here for some generic debugging hints:

http://wiki.nginx.org/Debugging

-- 
Maxim Dounin
http://nginx.org/