public function handle($request, Closure $next, $options = [])
    {
        $response = $next($request);

        if (! $request->isMethodCacheable() || ! $response->getContent()) {
            return $response;
        }

        if (is_string($options)) {
            $options = $this->parseOptions($options);
        }

        if (isset($options['etag']) && $options['etag'] === true) {
            $options['etag'] = md5($response->getContent());
        }

        $response->setCache($options);
        $response->isNotModified($request);

        return $response;
    }