DynamicPageCacheSubscriber::$dynamicPageCacheRedirectRenderArray

protected $dynamicPageCacheRedirectRenderArray = [
  '#cache' => [
    'keys' => ['response'],
    'contexts' => [
      'route',
      // Some routes' controllers rely on the request format (they don't have
      // a separate route for each request format). Additionally, a controller
      // may be returning a domain object that a KernelEvents::VIEW subscriber
      // must turn into an actual response, but perhaps a format is being
      // requested that the subscriber does not support.
      // @see \Drupal\Core\EventSubscriber\AcceptNegotiation406::onViewDetect406()
      'request_format',
    ],
    'bin' => 'dynamic_page_cache',
  ],
];