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

	}
	if features.HTTP10 || enableHTTP10(node.Metadata.HTTP10) {
		httpOpts.AcceptHttp_10 = true
	}

	fcs := []*filterChainOpts{{
		httpOpts: &httpListenerOpts{
			rds:              model.RDSHttpProxy,
			useRemoteAddress: false,
			connectionManager: &hcm.HttpConnectionManager{
				HttpProtocolOptions:        httpOpts,
				ServerName:                 ph.ServerName,