public function handleError(\Jivoo\Http\ActionRequest $request, \Psr\Http\Message\ResponseInterface $response)
    {
        if (isset($this->errorHandler)) {
            return call_user_func($this->errorHandler, $request, $response);
        }
        return $response->withBody(new \Jivoo\Http\Message\StringStream('Asset not found'))
            ->withStatus(\Jivoo\Http\Message\Status::NOT_FOUND);
    }