etcdserver/etcdserverpb/gw/rpc.pb.gw.go
func RegisterClusterHandler(ctx context.Context, mux *runtime.ServeMux, conn *grpc.ClientConn) error {
	return RegisterClusterHandlerClient(ctx, mux, etcdserverpb.NewClusterClient(conn))
}
func RegisterClusterHandler(ctx context.Context, mux *runtime.ServeMux, conn *grpc.ClientConn) error {
	return RegisterClusterHandlerClient(ctx, mux, etcdserverpb.NewClusterClient(conn))
}
// RegisterClusterHandler registers the http handlers for service Cluster to "mux".
// The handlers forward requests to the grpc endpoint over "conn".