I configured W3 Total Cache and managed to speed up my blog considerably due to page cache and CDN. However, in spite of enabling the option, gzip compression and expires headers are not working. I found this with YSlow and confirmed it with http://analyze.websiteoptimization.com. (My blog is at http://www.bansuriflute.com)
When I do compatibility check, it says that following are not found. I checked with my hosting service (fatcow) and they say these are installed correctly on web server.
mod_mime: Not detected
mod_expires: Not detected
mod_deflate / mod_gzip: Not detected
mod_headers: Not detected
mod_env: Not detected
mod_setenvif: Not detected
mod_rewrite: Not detected
Any clues what might be going on?
The rest of the compatibility check is.
HP Version: 5.2.12
PHP Timezone: OK
Web Server: Apache
FTP functions: OK (required for Self-hosted (FTP) CDN support)
Multibyte String support: OK (required for Rackspace Cloud Files support)
cURL extension: OK (required for Amazon S3 support)
zlib extension: OK (required for compression support)
Opcode cache: Not installed
Memcache extension: Not installed
Mime type detection: Not installed
Hash function: hash (required for NetDNA purge support)
Safe mode: Off
Open basedir: Off
zlib output compression: Off
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