Does mootools in this list? 10.4.2.4. Detecting AJAX Requests
Zend_Controller_Request_Http has a rudimentary method for detecting AJAX requests: isXmlHttpRequest(). This method looks for an HTTP request header X-Requested-With with the value 'XMLHttpRequest'; if found, it returns true. Currently, this header is known to be passed by default with the following JS libraries: - Prototype/Scriptaculous (and libraries derived from Prototype) - Yahoo! UI Library - jQuery - MochiKit
