efw *model.EnvoyFilterWrapper,
	efKeys []string,
) (*discovery.Resource, bool) {
	listenerPort, useSniffing, err := extractListenerPort(routeName)
	if err != nil && routeName != model.RDSHttpProxy && !strings.HasPrefix(routeName, model.UnixAddressPrefix) {
		// TODO: This is potentially one place where envoyFilter ADD operation can be helpful if the