return nil, err
	}
	if err := updateAuthHdrs(ctx, uri, "gcp", c.gcpCreds, ret, "authorization"); err != nil {
		return nil, err
	}
	return ret, nil
}

func (*meshAuthCredentials) RequireTransportSecurity() bool {
	return true
}

func updateAuthHdrs(ctx context.Context, uri []string, kind string, creds credentials.PerRPCCredentials, dst map[string]string, dstHdr string) error {