The Apache mod_deflate module compresses output on your server before sending it to the client. All modern browsers support this feature, and it is an easy way to stretch your bandwidth a little farther. Depending on the content on your site, you can see bandwidth savings of up to 25%To enable, make sure that you have the Apache mod_deflate module installed (it is by default on most installations). Then simply put copy/paste these settings into your Apache config fileSometimes you want to deflate only text files. For that, comment out the SetEnvIfNoCase line and replace the "SetOutputFilter DEFLATE" line with the following:
Now, you can also add some extra logging to a virtual host to have the module save compression statistics about each request
Once you've made all of these changes to the Apache config, restart Apache to have them take effect.Once you've been serving compressed files for a little while, you can use a script like the one at 
http://prefetch.net/code/deflate-stats.pl to analyze the deflate_log and tell you how much bandwidth you have saved.You can also use this handy link to test your setup, and if your browser is sending the right Accept-Encoding:http://www.whatsmyip.org/mod_gzip_test/If your enabling mod_deflate because your site seems slow, and uses a lot of images or multimedia files, this link may be helpful:http://developer.yahoo.com/performance/rules.html
## Enable the module LoadModule deflate_module modules/mod_deflate.so# Create the output filter SetOutputFilter DEFLATE# Netscape 4.x has some problems… BrowserMatch ^Mozilla/4 gzip-only-text/html# Netscape 4.06-4.08 have some more problems BrowserMatch ^Mozilla/4.0[678] no-gzip# MSIE masquerades as Netscape, but it is fine BrowserMatch \bMSIE !no-gzip !gzip-only-text/html## Don't compress for IE5.0 BrowserMatch "MSIE 5.0" no-gzip# Don't compress images, flash, PDFs, or JavaScript # You might want to add more extensions to this list such as ogg|mp3|mov|avi SetEnvIfNoCase Request_URI.(?:gif|jpe?g|png|swf|js|pdf)$ no-gzip dont-vary# Make sure proxies don't deliver the wrong content Header append Vary User-Agent env=!dont-vary## Sset up some stuff for mod_deflate stats DeflateFilterNote Input instream DeflateFilterNote Output outstream DeflateFilterNote Ratio ratioLogFormat '"%r" %{outstream}n/%{instream}n (%{ratio}n%%)' deflate ## END mod_deflate configuration
AddOutputFilterByType DEFLATE text/css text/csv text/html text/plain application/xml application/xhtml+xml image/x-icon
CustomLog /var/logs/httpd/deflate.log deflate
http://prefetch.net/code/deflate-stats.pl to analyze the deflate_log and tell you how much bandwidth you have saved.You can also use this handy link to test your setup, and if your browser is sending the right Accept-Encoding:http://www.whatsmyip.org/mod_gzip_test/If your enabling mod_deflate because your site seems slow, and uses a lot of images or multimedia files, this link may be helpful:http://developer.yahoo.com/performance/rules.html
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