diff --git a/go/vendor/google.golang.org/grpc/resolver/dns/pre_go19.go b/go/vendor/google.golang.org/grpc/resolver/dns/pre_go19.go
new file mode 100644
index 0000000..7042811
--- /dev/null
+++ b/go/vendor/google.golang.org/grpc/resolver/dns/pre_go19.go
@@ -0,0 +1,51 @@
+// +build go1.6, !go1.9
+
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package dns
+
+import (
+	"fmt"
+	"net"
+
+	"golang.org/x/net/context"
+)
+
+var (
+	defaultResolver netResolver = &preGo19Resolver{}
+)
+
+type preGo19Resolver struct {
+}
+
+func (*preGo19Resolver) LookupHost(ctx context.Context, host string) ([]string, error) {
+	return net.LookupHost(host)
+}
+
+func (*preGo19Resolver) LookupSRV(ctx context.Context, service, proto, name string) (string, []*net.SRV, error) {
+	return net.LookupSRV(service, proto, name)
+}
+
+func (*preGo19Resolver) LookupTXT(ctx context.Context, name string) ([]string, error) {
+	return net.LookupTXT(name)
+}
+
+var customAuthorityResolver = func(authority string) (netResolver, error) {
+	return nil, fmt.Errorf("Default DNS resolver does not support custom DNS server with go < 1.9")
+}