class ErrorController

class ErrorController {
    public function __construct(HttpKernelInterface $kernel, string|object|array|null $controller, ErrorRendererInterface $errorRenderer) {
    }
    public function __invoke(\Throwable $exception) : Response {
        $exception = $this->errorRenderer
            ->render($exception);
        return new Response($exception->getAsString(), $exception->getStatusCode(), $exception->getHeaders());
    }
    public function preview(Request $request, int $code) : Response {
        
        /*
         * This Request mimics the parameters set by
         * \Symfony\Component\HttpKernel\EventListener\ErrorListener::duplicateRequest, with
         * the additional "showException" flag.
         */
        $subRequest = $request->duplicate(null, null, [
            '_controller' => $this->controller,
            'exception' => new HttpException($code, 'This is a sample exception.'),
            'logger' => null,
            'showException' => false,
        ]);
        return $this->kernel
            ->handle($subRequest, HttpKernelInterface::SUB_REQUEST);
    }

}