retry on 400?

david.birdsong · 2014-08-26T07:16:38+00:00

Not large, but many operations. With 500 simultaneous requests (or per second) we have 500 file IO operations, which are blocking. Is this acceptable? And w...

retry on 400?

david.birdsong

Hello, we're trying to figure out a bug in our HTTP app server that causes unexplained 400's from time to time. It would be nice to lean on our proxy stack (both openresty + haproxy) to supply a band-aid solution in the mean time that resends any http 400 request a second time.

http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_next_upstream

..this would work fine, but http_400 is not available.

The request bodes are images, so I can't use a full location capture. Any ideas?

agentzh

Hello!

On Mon, Aug 25, 2014 at 4:16 PM, David Birdsong wrote:
> Hello, we're trying to figure out a bug in our HTTP app server that causes
> unexplained 400's from time to time. It would be nice to lean on our proxy
> stack (both openresty + haproxy) to supply a band-aid solution in the mean
> time that resends any http 400 request a second time.
>

400 means bad requests, like malformed request line or request
headers. Given that the request is incomplete and bad, I don't think
it makes much sense to proceed any further :)

Better fix your backend app server :)

Regards,
-agentzh

david.birdsong

On Mon, Aug 25, 2014 at 5:55 PM, Yichun Zhang (agentzh) <age...@gmail.com> wrote:

Hello!

On Mon, Aug 25, 2014 at 4:16 PM, David Birdsong wrote:
> Hello, we're trying to figure out a bug in our HTTP app server that causes
> unexplained 400's from time to time. It would be nice to lean on our proxy
> stack (both openresty + haproxy) to supply a band-aid solution in the mean
> time that resends any http 400 request a second time.
>

400 means bad requests, like malformed request line or request
headers. Given that the request is incomplete and bad, I don't think
it makes much sense to proceed any further :)

Better fix your backend app server :)

right, our backend app server has a bug that we're fixing. the same request retried will return a 200. i want to use nginx to buy us more time to find the bug and fix it.

Regards,
-agentzh
.