Regarding keepalive and idempotency
mdounin at mdounin.ru
Thu Jan 9 13:21:07 UTC 2014
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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