On Mon, Jul 21, 2014 at 04:35:25PM -0500, Kevin Day wrote:
> I’d like to get fancy with grace stored objects, but I’m not sure how to do
> this. Can I determine if there’s a grace object I could deliver? Basically I
> want my logic to be:
> 1) If the backend returns a 200, cache and deliver as normal.
> 2) If the backend returns anything other than a 200, and I have a stale
> object I could serve anyway, serve it.
> 3) If the backend returns anything other than a 200, restart to redirect to a
> final fallback.
> I know how to do #1 and #3, but I’m not sure where/how I can do #2. Is there
> a way of determining if I could fallback to a stale object? If so, any
> pointers?
You can do (2) with saint mode and a restart:
https://www.varnish-cache.org/docs/3.0/tutorial/handling_misbehaving_servers.html#saint-mode
If this fails, because you didn't have a stale object available, you can
do (3) via vcl_error automatically.
--
Lasse Karstensen
Varnish Software AS
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