startAuthentication example

return;
            }
        } while (null !== $exception = $exception->getPrevious());
    }

    private function handleAuthenticationException(ExceptionEvent $event, AuthenticationException $exception): void
    {
        $this->logger?->info('An AuthenticationException was thrown; redirecting to authentication entry point.', ['exception' => $exception]);

        try {
            $event->setResponse($this->startAuthentication($event->getRequest(), $exception));
            $event->allowCustomResponseCode();
        } catch (\Exception $e) {
            $event->setThrowable($e);
        }
    }

    private function handleAccessDeniedException(ExceptionEvent $event, AccessDeniedException $exception): void
    {
        $event->setThrowable(new AccessDeniedHttpException($exception->getMessage(), $exception));

        $token = $this->tokenStorage->getToken();