Re: [squid-users] TCP_REFRESH_HIT instead of TCP_HIT?

>From: Robert Collins <robertc@squid-cache.org>
>To: Y Jones <yeattsj@hotmail.com>
>CC: Squid Users <squid-users@squid-cache.org>
>Subject: Re: [squid-users] TCP_REFRESH_HIT instead of TCP_HIT?
>Date: Thu, 6 Nov 2003 05:38:27 +0700
>
>On Thu, 2003-11-06 at 08:11, Y Jones wrote:
> > I am running 3.0-PRE3-20031002 in accelerator mode on port 80 with
>apache
>on
> > port 81.
> >
> > Here are the headers when fetching a page straight from apache:
> > HTTP/1.1 200 OK
> > Date: Wed, 05 Nov 2003 20:23:51 GMT
> > Server: Apache/1.3.28 (Unix)
> > Cache-Control: max-age=86400
> > Expires: Thu, 06 Nov 2003 20:23:51 GMT
> > Surrogate-Control: max-age=3600, content="ESI/1.0"
> > Last-Modified: Wed, 05 Nov 2003 20:20:23 GMT
> > Connection: close
> > Content-Type: text/html
> >
> > It looks to me like this page should get cached for 3600 seconds at
>least.
> >
> > Fetching the page from the squid on the same machine a few seconds later
> > gives these changes/additions:
> > Date: Wed, 05 Nov 2003 20:20:46 GMT (date is slightly older than
> > above)
> > Expires: Thu, 06 Nov 2003 20:20:46 GMT (date is slightly older than
> > above)
> > Last-Modified: Wed, 05 Nov 2003 20:20:23 GMT (date is the same as
> > above)
>
>Thats weird. Given that the processes are on the same machine. Could you
>file a bug please?

ok. done.

>
> > Age: 187
> > X-Cache: HIT from www.myserver.com
> > Via: 1.0 www.myserver.com (squid/3.0-PRE3-20031002)
> >
> > And access.log calls it a TCP_REFRESH_HIT, instead of a TCP_HIT.
> > And cache.log calls it STALE, with:
> > entry->timestamp: Wed, 05 Nov 2003 20:20:46 GMT
>
>It is stale - the expires has passed. the Surrogate Control header
>overrides this.

I'm sorry. I don't understand. It was Wednesday when I wrote this, and
the Expires for both the apache and squid responses said Thursday.
How do I need to set Surrogate-Control to
get TCP_HITs instead of TCP_REFRESH_HITs and how do I force
squid to reload this page, once I have?

>
> > I am using the default refresh_pattern. I am not using always_direct.
> >
> > Attempting to force a refresh of the object in the cache using:
> > squidclient -r -p80 -hwww.myserver.com
> > http://www.myserver.com/path/to/the/file.htm
> > ...yields a TCP_REFRESH_HIT and there is no change to "entry->timestamp"
>
>This is because the surrogate control overrides the browsers request for
>reloading. In a front-end scenario squid is authoritative for the
>content.
>
>Cheers,
>Rob
>--
>GPG key available at: <http://members.aardvark.net.au/lifeless/keys.txt>.

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Received on Thu Nov 06 2003 - 13:16:13 MST