Handling 400's without saint mode

[maillists0 at gmail.com]

Using Varnish 3.x to retrieve objects from s3. Due to a release process
that is beyond my control, some items are occasionally unavailable for 3 to
5 minutes when they're being recreated. Saint mode doesn't seem to do what
I need here.

What I really want is to check the backend first and then serve from cache
on a 400 for each request to this backend. Is that possible with Saint
mode, or is there a better way to do this?
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