Re: [squid-users] Can squid detect a 404 from origin??

On 22/11/10 18:56, Chris Toft wrote:
> Hi,
>
> Can squid detect a 404 from the origin servers?
>
> OK scenario is such: 2 data centres with backend storage. The DR
> datacentre is between 3 and 5 mins lag on the storage being mirrored
> but want to run active active data centres.
>
> So if someone hits the DR datacentre after an image that was uploaded
> to primary say 2 mins after the upload when it goes to the DR
> datacentre origin servers they will send a 404 as the image hasn't
> yet sync'd across.
>
> When this happens is it possible to configure squid that if it gets a
> 404 from origin at DR it will then check the origin servers in the
> primary site for the object?

What you want seems to match with the case of configuring DR server as a
*sibling* type with originserver flags. These are tested before parent
types.

Amos

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