Varnish Retry is not happening for some user requests (/GET)

[Uday Kumar]

Hi Guillaume,
We could not replicate the issue on test environment for requests with body
version on test env: varnish-5.2.1 *[version on prod env: varnish-6.0.11]*

Can this be because of the version?

*Thanks & Regards,*
*Uday Kumar*


On Thu, Oct 10, 2024 at 7:27 PM Uday Kumar <uday.polu at indiamart.com> wrote:

> Hi guillaume,
>
> Thanks, will check this and get back to you
>
> On Thu, Oct 10, 2024, 17:37 Guillaume Quintard <
> guillaume.quintard at gmail.com> wrote:
>
>> Hi Uday,
>>
>> Check your logs, it will probably tell you that the body was already
>> consumed and for this reason it can't retry. If that's the case, check out
>> https://varnish-cache.org/docs/trunk/reference/vmod_std.html#std-cache-req-body
>>
>> If not, please send us the complete logs (varnish -g request ...) and
>> we'll look at it in greater details.
>>
>> Cheers,
>>
>> --
>> Guillaume Quintard
>>
>>
>> On Thu, Oct 10, 2024 at 7:31 PM Uday Kumar <uday.polu at indiamart.com>
>> wrote:
>>
>>> Hello All,
>>>
>>> We have configured varnish in such a way that if one of the backend
>>> returns *404 code*, varnish retries the request on another healthy
>>> backend.
>>> Varnish version: varnish-6.0.11
>>>
>>> *Sample Configuration (default.vcl):*
>>> sub *vcl_backend_response *{
>>> if (beresp.status == 404 {
>>>             return(retry);
>>>         }
>>> }
>>>
>>> But in some cases, varnish retry is not happening as expected.
>>>
>>> Upon analysis we have found the only difference in requests is *payload*
>>>
>>>
>>>
>>> *Examples:Request Pattern-1:*
>>> /GET
>>> Request URL
>>> HTTP Protocol
>>> Request Headers
>>>
>>> *Request-Pattern-2:*
>>> /GET
>>> Request URL
>>> HTTP Protocol
>>> Request Headers
>>> *payload*
>>>
>>> Please help us understand if there are any scenarios where varnish
>>> retries won't happen.
>>>
>>> *Thanks & Regards,*
>>> *Uday Kumar*
>>> _______________________________________________
>>> varnish-misc mailing list
>>> varnish-misc at varnish-cache.org
>>> https://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc
>>>
>>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://www.varnish-cache.org/lists/pipermail/varnish-misc/attachments/20241011/c98720df/attachment-0001.html>