Peer cache behavior with expired objects

Apologies on the cross-post, but I've not been able to get my question
answered on the users list. I'm willing to look through the code for an
answer, but need some pointers on where to look. First the question:

>I'm experimenting with 2 Squid 3.1.3 instances in reverse proxy mode.
>They are configured to be peers of each other using ICP. I'm not using
>digests. When a cached resource has not yet expired, each instance
will
>successfully contact the other to retrieve the resource. However, when
>the resource is expired, no attempt is made to contact the peer. I'm
>trying to determine if that behavior can be changed.

>My question is, is there a way to configure Squid so that it will
>contact its peers when asked for an expired resource? I'm interested
in
>doing this to reduce the number of requests that make their way to the
>backend servers. If a peer has a fresh copy, I'd like that one to be
>used instead of sending the request to the backend.

Would anyone be able direct me to a location in the Squid source code
where I could try to find this myself? Or perhaps if there is
documentation on this that I missed I'd appreciate that as well.

Thanks,

Paul
Received on Thu May 06 2010 - 17:19:01 MDT