gistfile1.php

// in bootstrap
Configure::write('Dispatcher.filters', array(
	'fb-prefix' => array(
		'callable' => function($event){

/*

if (isset($this->params['prefix']) && method_exists($controller, $this->params['prefix'] . '_' . $this->params['action'])) {
				$this->params['action'] = $this->params['prefix'] . '_' . $this->params['action'];
			} elseif (strpos($this->params['action'], '_') > 0) {
				list($prefix, $action) = explode('_', $this->params['action']);
				$privateAction = in_array($prefix, $prefixes);
			}

*/

			if (
				!empty($event->data['request']->params['prefix']) &&
				$event->data['request']->params['prefix'] == 'fb' &&
				//method_exists()
			) {

			}
		},
		'on' => 'before'

	)

));