gzip compression in apache using mod_deflate

HTTP Compression is a very simple and effective way to save bandwidth and improve web applications performance over network.

Output compression is basically a process of compressing web servers response by using a loss-less compression algorithm called gzip.

This technique is fairly modern and almost all modern browsers honor it, however if a page is requested from a browser which does not send a header Accept-Encoding: gzip,deflate then the response comes back uncompressed.

In Apache under Ubuntu OS this is fairly simple.

Enable mod_deflate in Apache2 sudo a2enmod deflate

configure /etc/apache2/httpd.conf mod_deflate by adding content mentioned below.

# compress text, html, javascript, css, xml:
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
# Or, compress certain file types by extension:
<files *.html>
SetOutputFilter DEFLATE
</files>

Restart apache to anable the changes sudo apachectl graceful

There is another powerfull apache module called mod_gzip which can precompress output as well.

Hope this helps.

admin

gzip compression in apache using mod_deflate  by  admin