Regarding keepalive and idempotency

[Maxim Dounin]

Hello!

On Tue, Jan 07, 2014 at 10:44:26PM +0530, Fasihullah Askiri wrote:

> Thanks a lot for the clarification. Is there a timeline on the future
> plan? Is it like a few releases or is it more like a long term plan?

No ETA, it's a long term plan.

> 
> On 1/7/14, Maxim Dounin <mdounin at mdounin.ru> wrote:
> > Hello!
> >
> > On Sat, Jan 04, 2014 at 05:14:51PM +0530, Fasih wrote:
> >
> >> Hi guys
> >>
> >> Hello guys
> >>
> >> Nginx keepalive seems to retry automatically on failure. However for
> >> non-idempotent requests, it is incorrect by RFC to retry automatically
> >> because the server could have changed its state before nginx detected the
> >> error.
> >>
> >> Is this a bug that would be fixed or did I not get it right?
> >
> > As of now, keepalive connection retries aren't aware of
> > idempotence, much like proxy_next_upstream.  Retries are only done
> > in case of early errors though, and this is expected to be good
> > enought in most cases.
> >
> > The future plan is to teach proxy_next_upstream and friends about
> > idempotent or not idempotent methods, and probably also splitting
> > "error" state into errors before we were theoretically able to
> > send at least some bytes of the request (that is, retries are for
> > sure safe even in case of non-idempotent methods), and errors
> > after that point.
> >
> > --
> > Maxim Dounin
> > http://nginx.org/
> >
> > _______________________________________________
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> > nginx-devel at nginx.org
> > http://mailman.nginx.org/mailman/listinfo/nginx-devel
> >
> 
> 
> -- 
> +Fasih
> 
> Life is 10% what happens to you and 90% how you react to it
> 
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-- 
Maxim Dounin
http://nginx.org/