RE: [squid-users] What is the ICAP chain exactly?

On Thu, 2008-02-21 at 09:30 +0900, S.KOBAYASHI wrote:

> I almost clear "chain" now however I have a bit more questions.
> My thoughts "not only processing ICAP...." is as bellow.
> ICAP chain has only ability to connect to next service, or before go to next
> service, squid or previous service can control whether connect to next
> service or not (bypass).
> icap_service_1 ---> icap_service_2 --> and more. (only sequential process.)
> Or
> icap_service_1 ---> icap_service_3 --> .. (icap_service_1 can chose the next
> service.)
>
> Does that work for you?

I believe you are talking about "dynamic" chaining of ICAP services
(using previous ICAP response headers) as opposed to "static" chaining
(via squid.conf ACLs).

AFAIK, dynamic chaining is not supported by Squid2 ICAP patches. Its
Squid3 status is the same as general chaining support described below.
That is, developers are looking for those who need that kind of
functionality to provide patches or sponsorship.

HTH,

Alex.

> -----Original Message-----
> From: Alex Rousskov [mailto:rousskov@measurement-factory.com]
> Sent: Wednesday, February 20, 2008 3:38 PM
> To: S.KOBAYASHI
> Cc: 'Squid Users'
> Subject: Re: [squid-users] What is the ICAP chain exactly?
>
>
> On Wed, 2008-02-20 at 12:43 +0900, S.KOBAYASHI wrote:
>
> > I'v read some documents but I don't understand yet about ICAP chain how to
> > work and how to setup in the squid.cof.
> > I wonder if the squid can control sequence of connecting to some ICAP
> > service.
> > It's not only processing ICAP services in a row, but also controls
> sequence
> > of ICAP services.
> > Do my thoughts make sense? Or Is it possible?
>
> For a given HTTP message, Squid 3.0 can select zero or one ICAP service.
>
> Future Squid versions will probably be able to select a list of ICAP
> services for a given HTTP message. The services would then be applied
> one after another, in a chain- or pipe-like manner, where the output of
> the previous service becomes the input of the next one. Developers are
> looking for those who need that kind of functionality.
>
> Sorry, I do not know what you mean by "not only processing ICAP services
> in a row, but also controls sequence of ICAP services". An example might
> help.
>
> Thank you,
>
> Alex.
> P.S. Squid2 with some ICAP patches can support ICAP service chaining,
> but poorly.
>
>
Received on Mon Feb 25 2008 - 17:38:44 MST