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proxy_cache expired files

Posted by dbradfield 
proxy_cache expired files
January 30, 2011 07:16PM
Hi
It seems that when a file expires from cache, it is deleted and then GETs it again from the backend even if the file on the backend hasn't actually changed. It would be much more efficient to issue a HEAD request beforehand to check if Last-Modified has changed.
Has anyone come across this before?. It would be a great option to have and would save a lot of wasted bandwidth.

Many thanks
Dave
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