func getHTTPConnectionManager(filter *listener.Filter) *hcm.HttpConnectionManager {
	cm := &hcm.HttpConnectionManager{}
	if err := getFilterConfig(filter, cm); err != nil {
		log.Errorf("failed to get HTTP connection manager config: %s", err)
		return nil
	}
	return cm
}

func getHTTPFilterConfig(filter *hcm.HttpFilter, out proto.Message) error {
	switch c := filter.ConfigType.(type) {
	case *hcm.HttpFilter_TypedConfig: