I ended up using Varnish for this. I set a long TTL for the cache,
and then another long "grace" period for those expired objects. Then
I use a script to loop through all of my URLs and rewarm the cache
every few days.

https://www.varnish-cache.org/trac/wiki/VCLExampleHashAlwaysMiss

Seems to be working.

On Thu, Sep 22, 2011 at 1:03 PM, stonor <nginx-forum@nginx.us> wrote:
> I would love to see this too in Nginx.
>
> The pattern is described here: http://www.mnot.net/blog/2007/12/12/stale
>
>
> The only software I've seen this implemented in is Squid 2.7
> (stale-while-revalidate).
>
> From time to time I see backends taking 800ms+  to generate a page at
> low traffic. It would be nice to hide most of these requests to the end
> user.
>
> Posted at Nginx Forum: http://forum.nginx.org/read.php?2,214606,215654#msg-215654
>
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> http://mailman.nginx.org/mailman/listinfo/nginx
>

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