[squid-users] icap result caching in squid

[Darren Breeze]

Hi Amos

I have done some digging into your suggestion, and it looks like a better way to go for what I need to do.

> Also, are you aware that current Squid versions can generate redirects
> (custom headers included) based on output from an external_acl_type helper?
>  A helper to lookup your permissions system plus a few extra squid.conf
> settings would be a lot simpler in terms of traffic processing and
> bandwidth consumption than sending everything through an external ICAP
> service.

Are you able to point me in the direction of some sample config fragments that show how this can be done please.

I am guessing that I would need to return some custom keyword / value pairs from the external_acl and set other acls based on the values.

What I am aiming at is to selectively bump or redirect (or both) based on the client status and the site being requested.

Thanks again.

Darren B.



On Wed, Dec 4, 2019, at 6:26 PM, Amos Jeffries wrote:
> On 4/12/19 6:05 am, Darren Breeze wrote:
> > Hi Amos
> > 
> > The Icap service is doing redirects based on client permissions (that may change). What I am doing is just setting the Expires value in the RESP_MOD response when I return a 307 redirect so I can control how long the caches (both Squid and the browser) hang on to it.
> > 
> 
> In that case you should be using Cache-Control:max-age=NN instead where
> the NN being your desired TTL in seconds. This is a *lot* simpler and
> faster to deliver than calculating the timestamps needed for valid
> Expires header.
> 
> Also, are you aware that current Squid versions can generate redirects
> (custom headers included) based on output from an external_acl_type helper?
>  A helper to lookup your permissions system plus a few extra squid.conf
> settings would be a lot simpler in terms of traffic processing and
> bandwidth consumption than sending everything through an external ICAP
> service.
> 
> 
> Amos
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