[squid-users] icap result caching in squid

Darren Breeze darren at ksn-systems.com
Mon Dec 2 23:17:11 UTC 2019

Thanks Alex.

That has given me the perspective I need.

I can modulate the response header Expires value via icap to get the job done when squid goes to cache it.

Darren B.

*Darren Breeze*
*KSN Systems NZ Limited*
**E: *darren at ksn-systems.com*
**M:* +64 274 666 017*
**S:* dbinhk*

On Sun, Dec 1, 2019, at 6:22 AM, Alex Rousskov wrote:
> On 11/29/19 12:20 PM, Darren Breeze wrote:
> > Some quick question about icap result caching in squid.
> > 
> > Does the returned Expires header control how long squid will cache the
> > result (for both a req and resp mod)?
> > 
> > Are the values that are cached keyed to the queried URL or is it cached
> > per user / url?
> Squid only supports pre-cache vectoring points. Thus, bugs
> notwithstanding, post-ICAP headers should be treated (for caching
> purposes) as if Squid received the same adjusted HTTP message directly
> from an HTTP agent, and there were no ICAP modifications at all.
> The above statement does not answer your question, but it changes that
> question from "How ICAP-set X affects caching?" to "How X affects
> caching?" -- a question that you may already know the answer to or, if
> you do not, a question that others on the list may be able to answer
> better or faster than I currently can.
> HTH,
> Alex.
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