final String[] values = configName.split("/");
            if (values.length == 2) {
                final String configIndex = values[0];
                final String configType = values[1];

                final boolean isFessIndex = "fess".equals(configIndex);
                final String indexName;
                if (isFessIndex) {

	filterConfig := MaybeBuildStatefulSessionFilterConfig(svc)
	if filterConfig == nil {
		return nil
	}

	return &hcm.HttpFilter{
		Name: StatefulSessionFilter,
		ConfigType: &hcm.HttpFilter_TypedConfig{
			TypedConfig: protoconv.MessageToAny(filterConfig),
		},
	}
}

func MaybeBuildStatefulSessionFilterConfig(svc *model.Service) *statefulsession.StatefulSession {

			}
			opt.httpOpts.port = opts.port
			httpConnectionManagers[i] = builder.buildHTTPConnectionManager(opt.httpOpts)
			filter := &listener.Filter{
				Name:       wellknown.HTTPConnectionManager,
				ConfigType: &listener.Filter_TypedConfig{TypedConfig: protoconv.MessageToAny(httpConnectionManagers[i])},
			}
			filterChain.Filters = append(filterChain.Filters, filter)

			oldestService = s
		}
	}
	return oldestService
}

func getFilterConfig(filter *listener.Filter, out proto.Message) error {
	switch c := filter.ConfigType.(type) {
	case *listener.Filter_TypedConfig:
		if err := c.TypedConfig.UnmarshalTo(out); err != nil {
			return err
		}
	}
	return nil
}