All classes that implement OutboundRouteProcessorInterface in Drupal 9
- class \Drupal\Core\Access\RouteProcessorCsrf implements OutboundRouteProcessorInterface, TrustedCallbackInterface
- class \Drupal\Core\RouteProcessor\RouteProcessorCurrent implements OutboundRouteProcessorInterface
- class \Drupal\Core\RouteProcessor\RouteProcessorManager implements OutboundRouteProcessorInterface