Ouzo\Uri::isAjax PHP Method

    public static function isAjax()
    {
        return isset($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest';
    }

 private static function getViewPostfix($responseType)
 {
     $availableViewsMap = array('text/xml' => '.xml.phtml', 'application/json' => '.json.phtml', 'text/json' => '.json.phtml');
     $viewForType = Arrays::getValue($availableViewsMap, $responseType, false);
     if ($viewForType) {
         return $viewForType;
     }
     return Uri::isAjax() ? '.ajax.phtml' : '.phtml';
 }