You’ve enabled mod_deflate either via apxs as a module, or by recompiling httpd as a whole, but alas, no compression.
The apache virtual host is configured:
Allow from all
BrowserMatch ^Mozilla gzip-only-text/html
BrowserMatch ^Mozilla/4\.0 no-gzip
BrowserMatch \bMSI[E] !no-gzip !gzip-only-text/html
SetEnvIfNoCase Request_URI \.(?:gif|jpe?g|png)$ no-gzip dont-vary
Header append Vary User-Agent env=!dont-vary
The httpd process has been refreshed via apachectl ..
Yet in the error log..
[Sat Mar 29 15:47:16 2014] [error] an unknown filter was not added: DEFLATE
The solution may be stopping apache completely to shake the ghosts out.
/sbin/service httpd stop ; sleep 10 ; /sbin/service httpd start
Does this work for you?