Does Apache's mod_cache, used with mod_deflate cache the gziped file or cache the source?

Question

does Apache (Http-Webserver), when used with mod_cache and mod_deflate, cache the uncompressed source file and (and the compress it for every request) or does it directly save the compressed result in the cache and is therefore able to safe a lot of CPU-Resources as the file is only compressed once, when inserting it into the cache?

Thank your very much!! Jan

Answer 1

The cache filter saves the response after it's been compressed with mod_deflate.

Unfortunately with the default config using mod_disk_cache, you may find one cached resource per user-agent due to the Vary headers suggested by the manual.