There are basically two modules available for output compression: mod_gzip and mod_gunzip. They are using different approaches to reach the the goal of bandwidth reduction.
mod_gunzip expects compressed file on the filesystem, and uncompress them if the browser cannot handle compressed data. The benefit is a low cpu-usage, because most browsers are capable to handle gzipped content. On the oder side, most of today's content is served dynamically i.e. PHP, and this content will be delivered uncompressed.
mod_gzip does not need compressed files on the system, all defined content will be compressed before delivery. The benefit is to have the dynamically generated content also compressed, the other side is a higher cpu-usage, because every request has to be compressed on-the-fly. Mod_gzip can handle already compressed data i.e. index.html.gz and send it as-is.
The conclusion: You carefully have to make a decision which of the two modules makes more sense for you. If you have to pay for every GB delivered and CPU-power does not matter, then mod_gzip is the choice for you. If response time matters (delay between request and delivery), and your bandwidth is cheap or unlimited, mod_gunzip matches your needs better.
A good page that helps you to make this decision is Martin Kiff's document about mod_gunzip http://www.innerjoin.org/apache-compression/howto.html
Origin-Site: http://prdownloads.sourceforge.net/mod-gzip/mod_gzip-1.3.26.1a.tgz?download
To successfully compile mod_gzip you need to edit the Makefile and provide the correct path to apxs
make make install |
Put the following in your /usr/local/apache/conf/httpd.conf:
Example 5. /usr/local/apache/conf/httpd.conf
mod_gzip_on Yes mod_gzip_can_negotiate Yes mod_gzip_dechunk Yes mod_gzip_minimum_file_size 600 mod_gzip_maximum_file_size 0 mod_gzip_maximum_inmem_size 100000 mod_gzip_keep_workfiles No mod_gzip_temp_dir /usr/local/apache/gzip mod_gzip_item_include file \.html$ mod_gzip_item_include file \.txt$ mod_gzip_item_include file \.jsp$ mod_gzip_item_include file \.php$ mod_gzip_item_include file \.pl$ mod_gzip_item_include mime ^text/.* mod_gzip_item_include mime ^application/x-httpd-php mod_gzip_item_include mime ^httpd/unix-directory$ mod_gzip_item_include handler ^perl-script$ mod_gzip_item_include handler ^server-status$ mod_gzip_item_include handler ^server-info$ mod_gzip_item_exclude file \.css$ mod_gzip_item_exclude file \.js$ mod_gzip_item_exclude mime ^image/.* |
You may whish to log the result of the compression to your accesslog. This can be done by changing the LogFormat directive in /usr/local/apache/conf/httpd.conf
LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\" mod_gzip: %{mod_gzip_compression_ratio}npct." combined |
tar -xvzf mod_gunzip.tar.gz cd mod_gunzip-2 /usr/local/apache/bin/apxs -i -a -c -lz mod_gunzip.c |
Put the following in your /usr/local/apache/conf/httpd.conf:
Example 6. /usr/local/apache/conf/httpd.conf
AddType text/html .htmz AddHandler send-gunzipped .htmz |
Now you can gzip your html files and rename them to i.e:
gzip index.html mv index.html.gz index.htmz |
Of course you have to change all links to htmz, i.e. <a href="page.htmz">Some page</a>