Re: [squid-users] stale pages remain in cache

You might be bitten by an slightly obscure bug in Squid. When Squid
revalidates cached content it forgets to refresh the HTTP headers such
as Date or Expires, still giving out the old headers from the original
reply.

If you need to have this solved, contact me in private and we try to
arrange something.

Regards
Henrik Nordström
Squid Developer

Ryan Casey wrote:
>
> Our squid reverse cache server is not removing random stale pages from its
> cache. Some files it properly removes, but it will randomly serve files
> that should have expired. I haven't been able to determine a pattern to
> what files it keeps and which files it excludes.
>
> Here's a snippet of the header that squid is sending with the request:
>
> Date: Wed, 06 Mar 2002 10:25:57 GMT
> Content-Type: text/html
> Cache-Control: public
> Expires: Wed, 6-Mar-2002 10:30:57 GMT
> Age: 66146
> X-Cache: HIT from www.opensecrets.org
>
> This page should have expired an hour prior to this request.
>
> Our refresh patterns are:
> refresh_pattern -i \.asp 720 20% 720
> override-expire
> refresh_pattern . 720 20% 1440 override-expire
>
> Version: 2.4-Stable3 (rebuilt from RedHat's latest RPM package), using diskd.
>
> The store.log file shows the page being swapped out, and the access.log
> file shows a TCP_HIT for the request.
>
> I thought that it might have been a problem with the refresh_pattern(s) but
> I've seen at least one page stay in the cache for 3 weeks.
>
> Thanks,
> -Ryan Casey
Received on Tue Mar 26 2002 - 06:13:10 MST