Re: [squid-users] about the IMS request

From: Amos Jeffries <>
Date: Fri, 16 Dec 2011 19:08:27 +1300

On 16/12/2011 4:36 p.m., Jeff Pang wrote:
> Hello,
> if the site-arch is:
> original-server -> squid1 -> squid2 -> client

NOTE: this is a *reply* pathway. IMS is a *request*.

> When client send an IMS request to squid2, will squid2 pass it to
> squid1 then to original-server?
> Thanks.

The IMS effectively stops at squid2. Whether squid2 does a new IMS for
itself or a full fetch from squid1 depends on whether squid2 already has
a copy of that object, whether that copy is fresh or stale or newer than
the IMS date.

All those considerations are calculated, then a request is either
satisfied by squid2 or a request created from a combination of the
squid2 and client requirements is passed to squid1. squid1 then does
its own handling on the request sent by squid2.

Received on Fri Dec 16 2011 - 06:08:35 MST

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