varnish too fast for Captcha image with IIS backend

[Bedis 9]

Hi,

You can try to force a restart of the path of the captcha if the
beresp.status is 404.
But might be not slow enough...
Maybe adding a small INLINE C loop which waits for a few milliseconds
would help...

cheers



On Fri, May 28, 2010 at 9:32 PM, Caunter, Stefan <scaunter at topscms.com> wrote:
> Greetings:
>
>
>
> We have an email article pop-up with a captcha that works, when hit directly
> on a relatively slow IIS7 backend, since it has “time” to generate and get
> served as part of the pop-up.
>
>
>
> I observe that when we accelerate with varnish, the pop-up loads too
> quickly, and the captcha image is not built in time, so varnish serves a 404
> to the client, and the image is not there. Upon refresh it has been built
> and gets served. I am using client director and pipe (necessarily) to ensure
> we hit the same backend for the correct captcha and corresponding
> transactions.
>
>
>
> Is an individual 404 something to which we can introduce a small delay, or a
> restart?
>
>
>
> Can we potentially build a delay into vcl for the individual captcha
> requests to compensate for this slowness since these are not cacheable? Has
> anyone implemented a “patience” subroutine?
>
>
>
> Stefan Caunter :: Senior Systems Administrator :: TOPS
>
> e: scaunter at topscms.com  ::  m: (416) 561-4871
>
> www.thestar.com www.topscms.com
>
>
>
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>