if-none-match with proxy_cache : properly set headers

neoascetic nginx-forum at nginx.us
Sun Sep 29 05:47:37 UTC 2013

It is good to have `$request_method` in the cache key since HEAD and GET
methods may share same hash for content they point to

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,239689,243239#msg-243239

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