apache mod_deflate for css and js - php

Question

.htaccess
<ifmodule mod_deflate.c>
# compress the files
AddOutputFilterByType DEFLATE text/plain
AddOutputFilterByType DEFLATE text/html
AddOutputFilterByType DEFLATE text/xml
AddOutputFilterByType DEFLATE text/css
AddOutputFilterByType DEFLATE application/xml
AddOutputFilterByType DEFLATE application/xhtml+xml
AddOutputFilterByType DEFLATE application/rss+xml
AddOutputFilterByType DEFLATE application/javascript
AddOutputFilterByType DEFLATE application/x-javascript
# removes some bugs
BrowserMatch ^Mozilla/4 gzip-only-text/html
BrowserMatch ^Mozilla/4\.0[678] no-gzip
BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
Header append Vary User-Agent
</ifmodule>
And for the php files
<?php if (substr_count($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip'))
ob_start("ob_gzhandler"); else ob_start(); ?>
And for the php files everything is OK but no for css,js files. Any tips ?

Answer 1

To test that mod_deflate is ACTUALLY working, try putting this at the top of your httpd.conf file:
LoadModule deflate_module modules/mod_deflate.so
and in the bottom of your httpd.conf file:
##############################################
#Mod Deflate Config:
SetOutputFilter DEFLATE
BrowserMatch ^Mozilla/4 gzip-only-text/html
BrowserMatch ^Mozilla/4\.0[678] no-gzip
BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
DeflateFilterNote Input input_info
DeflateFilterNote Output output_info
DeflateFilterNote Ratio ratio_info
LogFormat '(%{ratio_info}n%%) "%r" %{output_info}n/%{input_info}n' deflate
CustomLog logs/compression.log deflate
###############################################
This will compress just about anything ONLY if the browser sends the gzip-ready header.
After you get some hits on your site, check "compression.log" in the apache logs folder.
Post the output.

Answer 2

In httpd.conf make sure this line is not commented
LoadModule deflate_module modules/mod_deflate.so
if it is then uncomment it and restart the apache service