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List:       squid-users
Subject:    Re: [SQU] HTTP header date
From:       Duane Wessels <wessels () squid-cache ! org>
Date:       2000-10-31 18:29:28
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On Tue, 31 Oct 2000, Marc Tardif wrote:

> > > Once a page is cached, does squid check the HTTP
> > > header date field of the website for each subsequent
> > > requests to make sure the cache is up to date? Where
> > > can I find details about this in the online docs?
> > 
> > Maybe the FAQ entry answers your question?
> > http://www.squid-cache.org/Doc/FAQ/FAQ-12.html#ss12.20
> > 
> Two more questions on the subject:
> - When refreshing a cached object, does Squid first
>   check the header of the URL and only download the
>   body if the HTTP Date reply header (OBJ_DATE) or
>   HTTP Last-Modified reply header (OBJ_LASTMOD) has
>   changed?

Squid does not use the HEAD method, if that is what you mean.

If Squid has the object cached, and the object has a last-modified
timestamp, then Squid sends an if-modified-since request.

Then the server doesn't send the whold body if the object didn't
change.

> 
> - If not, is there a way to have Squid simulate
>   this behavior and ALWAYS at least check the
>   header for each request even if the object is
>   cached?


Probably something like this would do what  you want:

	refresh_pattern 0 0 0 override-expires

Duane W.

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