*_cache_revalidate directives

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Hello Roman,

Thanks for the explanation.
At which moment this revalidation is executed? When there's a new client
request or is it done automatically when a cache entry is about to expire?
The nginx's cache manager is deleting expiring cache file, so I'm not sure
to understand how it all works.

Best Regards

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,260148,260151#msg-260151