diff --git a/go.mod b/go.mod
index 758f2f8e3..5fabfadc3 100644
--- a/go.mod
+++ b/go.mod
@@ -14,6 +14,7 @@ require (
 	go.opentelemetry.io/otel v1.0.0-RC3
 	go.opentelemetry.io/otel/sdk v1.0.0-RC3
 	go.opentelemetry.io/otel/trace v1.0.0-RC3
+	golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4
 	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
 	google.golang.org/genproto v0.0.0-20210805201207-89edb61ffb67
 	google.golang.org/grpc v1.39.1
diff --git a/transport/http/binding/test.pb.go b/internal/testdata/binding/test.pb.go
similarity index 99%
rename from transport/http/binding/test.pb.go
rename to internal/testdata/binding/test.pb.go
index b4bd28681..5f2318c7a 100644
--- a/transport/http/binding/test.pb.go
+++ b/internal/testdata/binding/test.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.27.1-devel
-// 	protoc        v3.17.2
+// 	protoc-gen-go v1.27.1
+// 	protoc        v3.17.3
 // source: test.proto
 
 package binding
diff --git a/transport/http/binding/test.proto b/internal/testdata/binding/test.proto
similarity index 100%
rename from transport/http/binding/test.proto
rename to internal/testdata/binding/test.proto
diff --git a/transport/http/binding/encode_test.go b/transport/http/binding/encode_test.go
index bf2ee291e..9cba7bc9f 100644
--- a/transport/http/binding/encode_test.go
+++ b/transport/http/binding/encode_test.go
@@ -3,34 +3,36 @@ package binding
 import (
 	"fmt"
 	"testing"
+
+	"github.com/go-kratos/kratos/v2/internal/testdata/binding"
 )
 
 func TestProtoPath(t *testing.T) {
-	url := EncodeURL("http://helloworld.Greeter/helloworld/{name}/sub/{sub.name}", &HelloRequest{Name: "test", Sub: &Sub{Name: "2233!!!"}}, false)
+	url := EncodeURL("http://helloworld.Greeter/helloworld/{name}/sub/{sub.name}", &binding.HelloRequest{Name: "test", Sub: &binding.Sub{Name: "2233!!!"}}, false)
 	fmt.Println(url)
 	if url != `http://helloworld.Greeter/helloworld/test/sub/2233!!!` {
 		t.Fatalf("proto path not expected!actual: %s ", url)
 	}
 
-	url = EncodeURL("http://helloworld.Greeter/helloworld/{name}/sub/{sub.naming}", &HelloRequest{Name: "test", Sub: &Sub{Name: "5566!!!"}}, false)
+	url = EncodeURL("http://helloworld.Greeter/helloworld/{name}/sub/{sub.naming}", &binding.HelloRequest{Name: "test", Sub: &binding.Sub{Name: "5566!!!"}}, false)
 	fmt.Println(url)
 	if url != `http://helloworld.Greeter/helloworld/test/sub/5566!!!` {
 		t.Fatalf("proto path not expected!actual: %s ", url)
 	}
 
-	url = EncodeURL("http://helloworld.Greeter/helloworld/sub", &HelloRequest{Name: "test", Sub: &Sub{Name: "2233!!!"}}, false)
+	url = EncodeURL("http://helloworld.Greeter/helloworld/sub", &binding.HelloRequest{Name: "test", Sub: &binding.Sub{Name: "2233!!!"}}, false)
 	fmt.Println(url)
 	if url != `http://helloworld.Greeter/helloworld/sub` {
 		t.Fatalf("proto path not expected!actual: %s ", url)
 	}
 
-	url = EncodeURL("http://helloworld.Greeter/helloworld/{name}/sub/{sub.name}", &HelloRequest{Name: "test"}, false)
+	url = EncodeURL("http://helloworld.Greeter/helloworld/{name}/sub/{sub.name}", &binding.HelloRequest{Name: "test"}, false)
 	fmt.Println(url)
 	if url != `http://helloworld.Greeter/helloworld/test/sub/` {
 		t.Fatalf("proto path not expected!actual: %s ", url)
 	}
 
-	url = EncodeURL("http://helloworld.Greeter/helloworld/{name}/sub/{sub.name33}", &HelloRequest{Name: "test"}, false)
+	url = EncodeURL("http://helloworld.Greeter/helloworld/{name}/sub/{sub.name33}", &binding.HelloRequest{Name: "test"}, false)
 	fmt.Println(url)
 	if url != `http://helloworld.Greeter/helloworld/test/sub/{sub.name33}` {
 		t.Fatalf("proto path not expected!actual: %s ", url)
diff --git a/transport/http/resolver_test.go b/transport/http/resolver_test.go
index 641fdfdc5..115982371 100644
--- a/transport/http/resolver_test.go
+++ b/transport/http/resolver_test.go
@@ -1,8 +1,12 @@
 package http
 
 import (
+	"context"
+	"errors"
 	"testing"
 
+	"github.com/go-kratos/kratos/v2/registry"
+	"github.com/go-kratos/kratos/v2/selector"
 	"github.com/stretchr/testify/assert"
 )
 
@@ -27,3 +31,52 @@ func TestParseTarget(t *testing.T) {
 	assert.Nil(t, err)
 	assert.Equal(t, &Target{Scheme: "https", Authority: "127.0.0.1:8000"}, target)
 }
+
+type mockRebalancer struct{}
+
+func (m *mockRebalancer) Apply(nodes []selector.Node) {}
+
+type mockDiscoverys struct{}
+
+func (*mockDiscoverys) GetService(ctx context.Context, serviceName string) ([]*registry.ServiceInstance, error) {
+	return nil, nil
+}
+
+func (*mockDiscoverys) Watch(ctx context.Context, serviceName string) (registry.Watcher, error) {
+	return &mockWatch{}, nil
+}
+
+type mockWatch struct {
+	count int
+}
+
+func (m *mockWatch) Next() ([]*registry.ServiceInstance, error) {
+	if m.count == 0 {
+		m.count++
+		return nil, errors.New("mock test error")
+	}
+	instance := &registry.ServiceInstance{
+		ID:        "1",
+		Name:      "kratos",
+		Version:   "v1",
+		Metadata:  map[string]string{},
+		Endpoints: []string{},
+	}
+	return []*registry.ServiceInstance{instance}, nil
+}
+
+func (m *mockWatch) Stop() error {
+	return nil
+}
+
+func TestResolver(t *testing.T) {
+	ta := &Target{
+		Scheme:    "http",
+		Authority: "",
+		Endpoint:  "http://127.0.0.1:9001",
+	}
+	_, err := newResolver(context.Background(), &mockDiscoverys{}, ta, &mockRebalancer{}, false, false)
+	assert.Nil(t, err)
+	_, err = newResolver(context.Background(), &mockDiscoverys{}, ta, &mockRebalancer{}, true, false)
+	assert.Nil(t, err)
+}