Roman Terekhin

$router = $di->getRouter(FALSE);
//$router = Phalcon\Mvc\Router(FALSE);
...
...
$router->notFound([
    'controller' => 'index',
    'action' => 'route404'
]);

...
class IndexController extends ControllerBase
{
   public function route404Action()
   {
        $this->view->disable();
        $this->response->setRawHeader('HTTP/1.1 404 Not Found');
        $this->response->setContent('<b>404, bratishka :(</b>');
        $this->response->send();
   }
}