Joomla Tips #1 : Turning On Caching

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Is it better than accelerate component ?

Oops, posted the wrong date on the curl command, should be one year forward, not one year back.

While this was helpful, we were still a bit put off that there was no local caching going on. We were able to overcome this problem by hacking index.php a bit.

The first item of business is to get rid of the section near initGzip() that says:

header( 'Expires: Mon, 26 Jul 1997 05:00:00 GMT' );
header( 'Last-Modified: ' . gmdate( 'D, d M Y H:i:s' ) . ' GMT' );
header( 'Cache-Control: no-store, no-cache, must-revalidate' );
header( 'Cache-Control: post-check=0, pre-check=0', false );
header( 'Pragma: no-cache' );

This code ensures no browser will attempt to cache your site. This really affects bandwidth!

Next in line was to implement a check if any of the database tables have been updated (except jos_session). If the client sends an If-Modified-Since header that is prior to our maximum database modification, we can safely return a 304 - not modified.

Finally, we implemented a simple Caching class that saves each REQUEST_URI seperatly. Components search, and some of our custom ones were intentionally left out, for various reasons.

You can check out the result for yourself by going to http://www.redtreesystems.com. Click around a bit. Fast, yeah? But here's the real treat:

curl -H "If-Modified-Since: Fri, 07 Oct 2005 02:34:50 GMT" -i http://www.redtreesystems.com />
Returns:
HTTP/1.1 304 Not Modified
ate: Fri, 20 Oct 2006 00:15:32 GMT

Hope this is useful to somebody.