/*
 * Plugin for MODX CDN integration.
 * The plugin replaces source URLs of images, CSS and JS to CDN URLs. The plugin
 * replaces URL only if the corresponding CDN URL returns 200 response code.
 * To increase the performance the plugin does not replace (and test) URLs on the fly but
 * it creates an array of already successful replacement pairs and stores the array
 * in the local MODX cache. Please note that as a consequence of this  
 * to "reset the plugin" you need to flush the local MODX cache.
 * 
 * Please note that the plugin replaces only relative URLs, so for example
 * it will replace src="/photos/photo.jpg" but it will not replace src="http://domain.com/photos/photo.jpg"
 * 
 * To configure the plugin just adjust the $this->_cdnServiceUrl variable in the __construct function
 * 
 */

More details: http://cdnsun.com/knowledgebase/integrations/modx-cdn-integration