Re: haproxy / Python 'tornado' framework - digging into 502/504 errors

Sorry, I was being silly - you are right. Thank you for confirming!

On Wed, Sep 14, 2011 at 8:14 AM, Willy Tarreau <w#1wt.eu> wrote:

> On Wed, Sep 14, 2011 at 07:20:33AM +0100, Alex Davies wrote:
> > Hi Willy, Cyril,
> >
> > Thank you for your detailed analysis. I still notice 504 errors almost
> > immediately on a HAproxy start, and the PID matches the new process:
>
> Sorry, but this is not possible as it requires the timeout to be elapsed.
>
> > [root#frontend2 log]# tail -f haproxy.log | grep 504
> > Sep 14 07:16:14 localhost haproxy[21178]:
> > 94.197.40.185:3504[14/Sep/2011:07:16:08.216] main
> > python_8001/python_8001_fe1 80/0/0/-1/6449
> > 502 204 - - SH-- 3375/3375/950/950/0 0/0 "POST /xxx/chat/status/updates
> > HTTP/1.1"
> > Sep 14 07:16:15 localhost haproxy[21178]:
> > 118.101.95.88:49504[14/Sep/2011:07:16:10.298] main
> > python_9003/python_9003_fe1 22/0/0/-1/5088
> > 502 204 - - SH-- 3312/3312/386/386/0 0/0 "POST
> /xxx/chat/message/3/updates
> > HTTP/1.1"
>
> Look closely, those are 502 not 504.
>
> The most important are the termination flags. SH means connection aborted
> by the server ('S') while haproxy was waiting for it to emit response
> headers ('H').
>
> Regards,
> Willy
>
>

-- 
Alex Davies

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