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The Request Handler component is used in CakePHP to obtain additional information about the HTTP requests that are made to your applications. You can use it to inform your controllers about Ajax as well as gain additional insight into content types that the client accepts and automatically changes to the appropriate layout when file extensions are enabled.

By default RequestHandler will automatically detect Ajax requests based on the HTTP-X-Requested-With header that many javascript libraries use. When used in conjunction with Router::parseExtensions() RequestHandler will automatically switch the layout and view files to those that match the requested type. Furthermore, if a helper with the same name as the requested extension exists, it will be added to the Controllers Helper array. Lastly, if XML data is POST'ed to your Controllers, it will be parsed into an XML object which is assigned to Controller::data, and can then be saved as model data. In order to make use of Request Handler it must be included in your $components array.

<?php
class WidgetController extends AppController {
    
	var $components = array('RequestHandler');
	
	//rest of controller
}
?>

1. <?php
2. class WidgetController extends AppController {
4. var $components = array('RequestHandler');
6. //rest of controller
7. }
8. ?>