sarim Wrote:

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The middle tier needs to have gzip enabled, as well as the front-end tier. You will also need to enable gzip for HTTP 1.0 on the middle tier using "gzip_http_version 1.0;" This is because nginx uses HTTP 1.0 to talk with back-end servers (which in this case is nginx itself). Finally, consider normalizing the gzip headers and adding it to your proxy_cache_key at the frontmost layer, like so:

#normalize all incoming accept-encoding headers to just gzip or empty string #prevents caching of multiple versions of files based on differing browser accept-encoding headers set $myae ""; #use empty string if accept-encoding does not contain gzip if ($http_accept_encoding ~* gzip) { set $myae "gzip"; } location <whatever> { proxy_pass http://localhost:20080; #middle tier doing compression proxy_set_header Host $host; proxy_set_header Accept-Encoding $myae; proxy_cache zone1; proxy_cache_key "$request_uri $myae"; #use normalized accept encoding as part of cache key }

Posted at Nginx Forum:
http://forum.nginx.org/read.php?2,212423,213699#msg-213699