Re: [squid-users] How to override expires, maxage, s-maxage on reverse proxy?

On Jul 29, 2007, at 2:52 PM, Michael Pye wrote:

> Ricardo Newbery wrote:
>> Again, I'm not sure refresh_pattern will solve my usecase since:
>> 1) The docs above don't explicitly say that any of the options will
>> override max-age and s-maxage, and
>> 2) It appears that refresh_pattern can only be applied to a
>> regex-matching URI, whereas I would like to apply it selectively
>> based
>> on the initial response headers
>
> I just setup a small test case with 2 squid servers -
> squid1) has only the default refresh patterns
> squid2) has an enforced minumum age on the refresh pattern that
> matches
> the domain I was requesting of 10 minutes.
>
> The 1st squid forwards to the 2nd squid which forwards to apache.
> apache
> is setting headers:
> Cache-Control: public, s-maxage=150, max-age=150
> Expires: Sun, 29 Jul 2007 21:31:23 GMT
>
> The minumum age is set to 10 minutes and it does indeed keep cached
> for
> 10 minutes on the 2nd squid, and the 1st squid expires it after 150
> seconds.
>
> You can then override cache-control headers if you want with
> refresh_pattern min setting if you want to cache longer, and probably
> max setting also if you wanted to cache for a shorter period of time.
>
> Regarding your 2nd point there is no way I know of to set refresh
> directives other than for matching a regex against a URI. It is
> something that would be useful if it were to be added to squid I
> believe, to set refresh directives based on an ACL rather than a
> regex.

Thanks for the info.

Alternately, is it possible to have Squid delete s-maxage from its
response? That way I can set an s-maxage that will be seen only by
the reverse-proxy.

Ric
Received on Sun Jul 29 2007 - 16:32:51 MDT