public static function clearCache()
    {
        $expiryHandler = eZExpiryHandler::instance();
        if( $expiryHandler->hasTimestamp( ezpRestRouter::ROUTE_CACHE_KEY ) )
        {
            $expiryHandler->setTimestamp( ezpRestRouter::ROUTE_CACHE_KEY, 0 );
            $expiryHandler->store();
        }
    }