Re: [squid-users] How get negative cache along with origin server error?

From: Chris Nighswonger <>
Date: Sat, 4 Oct 2008 12:55:15 -0400

Hi Dave,

On Tue, Sep 30, 2008 at 6:13 PM, Dave Dykstra <> wrote:
> I found out a little bit more by looking in the source code and the
> generated headers and setting a few breakpoints. The squid closest to
> the origin server that is down (the one at the top of the cache_peer
> parent hierarchy) never attempts to store the negative result. Worse,
> it sets an Expires: header that is equal to the current time. Squids
> further down the hierarchy do call storeNegativeCache() but they see
> an expiration time that is already past so it isn't of any use.
> Those things make it seem like squid is far from being able to
> effectively handle failing over from one origin server to another
> at the application level.
> - Dave
> On Tue, Sep 30, 2008 at 10:32:43AM -0500, Dave Dykstra wrote:
>> Do any of the squid experts have any answers for this?
>> - Dave
>> On Thu, Sep 25, 2008 at 02:04:09PM -0500, Dave Dykstra wrote:
>> > I am running squid on over a thousand computers that are filtering data
>> > coming out of one of the particle collision detectors on the Large
>> > Hadron Collider.

A bit off-topic here, but I'm wondering if these squids are being used
in CERN's new computing grid? I noticed Fermi was helping out with
this. (

Received on Sat Oct 04 2008 - 16:55:22 MDT

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