diff --git a/dtmgrpc/dtmgimp/grpc_clients.go b/dtmgrpc/dtmgimp/grpc_clients.go
index fb7caa0..917f322 100644
--- a/dtmgrpc/dtmgimp/grpc_clients.go
+++ b/dtmgrpc/dtmgimp/grpc_clients.go
@@ -7,10 +7,10 @@
 package dtmgimp
 
 import (
-	sync "sync"
-
+	"fmt"
 	"github.com/yedf/dtm/dtmcli/dtmimp"
 	grpc "google.golang.org/grpc"
+	"sync"
 )
 
 type rawCodec struct{}
@@ -20,9 +20,10 @@ func (cb rawCodec) Marshal(v interface{}) ([]byte, error) {
 }
 
 func (cb rawCodec) Unmarshal(data []byte, v interface{}) error {
-	ba, _ := v.([]byte)
-	for index, byte := range data {
-		ba[index] = byte
+	ba, ok := v.(*[]byte)
+	dtmimp.PanicIf(!ok, fmt.Errorf("please pass in *[]byte"))
+	for _, byte := range data {
+		*ba = append(*ba, byte)
 	}
 	return nil
 }
diff --git a/dtmsvr/trans_status.go b/dtmsvr/trans_status.go
index 5dac5f8..e646f5d 100644
--- a/dtmsvr/trans_status.go
+++ b/dtmsvr/trans_status.go
@@ -91,7 +91,7 @@ func (t *TransGlobal) getURLResult(url string, branchID, op string, branchPayloa
 		}
 		conn := dtmgimp.MustGetGrpcConn(server, true)
 		ctx := dtmgimp.TransInfo2Ctx(t.Gid, t.TransType, branchID, op, "")
-		err = conn.Invoke(ctx, method, branchPayload, []byte{})
+		err = conn.Invoke(ctx, method, branchPayload, &[]byte{})
 		if err == nil {
 			return dtmcli.ResultSuccess, nil
 		}
diff --git a/examples/base_grpc.go b/examples/base_grpc.go
index 793cba9..91546a5 100644
--- a/examples/base_grpc.go
+++ b/examples/base_grpc.go
@@ -77,9 +77,9 @@ type busiServer struct {
 	UnimplementedBusiServer
 }
 
-func (s *busiServer) CanSubmit(ctx context.Context, in *BusiReq) (*emptypb.Empty, error) {
+func (s *busiServer) CanSubmit(ctx context.Context, in *BusiReq) (*BusiReply, error) {
 	res := MainSwitch.CanSubmitResult.Fetch()
-	return &emptypb.Empty{}, dtmgimp.Result2Error(res, nil)
+	return &BusiReply{Message: "a sample"}, dtmgimp.Result2Error(res, nil)
 }
 
 func (s *busiServer) TransIn(ctx context.Context, in *BusiReq) (*emptypb.Empty, error) {
diff --git a/examples/busi.pb.go b/examples/busi.pb.go
index 64df1a7..7746311 100644
--- a/examples/busi.pb.go
+++ b/examples/busi.pb.go
@@ -1,9 +1,3 @@
-/*
- * Copyright (c) 2021 yedf. All rights reserved.
- * Use of this source code is governed by a BSD-style
- * license that can be found in the LICENSE file.
- */
-
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.27.1
@@ -91,6 +85,53 @@ func (x *BusiReq) GetTransInResult() string {
 	return ""
 }
 
+type BusiReply struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Message string `protobuf:"bytes,1,opt,name=message,proto3" json:"message,omitempty"`
+}
+
+func (x *BusiReply) Reset() {
+	*x = BusiReply{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_examples_busi_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *BusiReply) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*BusiReply) ProtoMessage() {}
+
+func (x *BusiReply) ProtoReflect() protoreflect.Message {
+	mi := &file_examples_busi_proto_msgTypes[1]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use BusiReply.ProtoReflect.Descriptor instead.
+func (*BusiReply) Descriptor() ([]byte, []int) {
+	return file_examples_busi_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *BusiReply) GetMessage() string {
+	if x != nil {
+		return x.Message
+	}
+	return ""
+}
+
 var File_examples_busi_proto protoreflect.FileDescriptor
 
 var file_examples_busi_proto_rawDesc = []byte{
@@ -104,74 +145,77 @@ var file_examples_busi_proto_rawDesc = []byte{
 	0x74, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x0e, 0x54, 0x72, 0x61, 0x6e, 0x73, 0x4f, 0x75,
 	0x74, 0x52, 0x65, 0x73, 0x75, 0x6c, 0x74, 0x12, 0x24, 0x0a, 0x0d, 0x54, 0x72, 0x61, 0x6e, 0x73,
 	0x49, 0x6e, 0x52, 0x65, 0x73, 0x75, 0x6c, 0x74, 0x18, 0x03, 0x20, 0x01, 0x28, 0x09, 0x52, 0x0d,
-	0x54, 0x72, 0x61, 0x6e, 0x73, 0x49, 0x6e, 0x52, 0x65, 0x73, 0x75, 0x6c, 0x74, 0x32, 0x9a, 0x08,
-	0x0a, 0x04, 0x42, 0x75, 0x73, 0x69, 0x12, 0x38, 0x0a, 0x09, 0x43, 0x61, 0x6e, 0x53, 0x75, 0x62,
-	0x6d, 0x69, 0x74, 0x12, 0x11, 0x2e, 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x73, 0x2e, 0x42,
-	0x75, 0x73, 0x69, 0x52, 0x65, 0x71, 0x1a, 0x16, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e,
-	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x22, 0x00,
-	0x12, 0x36, 0x0a, 0x07, 0x54, 0x72, 0x61, 0x6e, 0x73, 0x49, 0x6e, 0x12, 0x11, 0x2e, 0x65, 0x78,
-	0x61, 0x6d, 0x70, 0x6c, 0x65, 0x73, 0x2e, 0x42, 0x75, 0x73, 0x69, 0x52, 0x65, 0x71, 0x1a, 0x16,
-	0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66,
-	0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x22, 0x00, 0x12, 0x37, 0x0a, 0x08, 0x54, 0x72, 0x61, 0x6e,
-	0x73, 0x4f, 0x75, 0x74, 0x12, 0x11, 0x2e, 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x73, 0x2e,
+	0x54, 0x72, 0x61, 0x6e, 0x73, 0x49, 0x6e, 0x52, 0x65, 0x73, 0x75, 0x6c, 0x74, 0x22, 0x25, 0x0a,
+	0x09, 0x42, 0x75, 0x73, 0x69, 0x52, 0x65, 0x70, 0x6c, 0x79, 0x12, 0x18, 0x0a, 0x07, 0x6d, 0x65,
+	0x73, 0x73, 0x61, 0x67, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x07, 0x6d, 0x65, 0x73,
+	0x73, 0x61, 0x67, 0x65, 0x32, 0x97, 0x08, 0x0a, 0x04, 0x42, 0x75, 0x73, 0x69, 0x12, 0x35, 0x0a,
+	0x09, 0x43, 0x61, 0x6e, 0x53, 0x75, 0x62, 0x6d, 0x69, 0x74, 0x12, 0x11, 0x2e, 0x65, 0x78, 0x61,
+	0x6d, 0x70, 0x6c, 0x65, 0x73, 0x2e, 0x42, 0x75, 0x73, 0x69, 0x52, 0x65, 0x71, 0x1a, 0x13, 0x2e,
+	0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x73, 0x2e, 0x42, 0x75, 0x73, 0x69, 0x52, 0x65, 0x70,
+	0x6c, 0x79, 0x22, 0x00, 0x12, 0x36, 0x0a, 0x07, 0x54, 0x72, 0x61, 0x6e, 0x73, 0x49, 0x6e, 0x12,
+	0x11, 0x2e, 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x73, 0x2e, 0x42, 0x75, 0x73, 0x69, 0x52,
+	0x65, 0x71, 0x1a, 0x16, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74,
+	0x6f, 0x62, 0x75, 0x66, 0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x22, 0x00, 0x12, 0x37, 0x0a, 0x08,
+	0x54, 0x72, 0x61, 0x6e, 0x73, 0x4f, 0x75, 0x74, 0x12, 0x11, 0x2e, 0x65, 0x78, 0x61, 0x6d, 0x70,
+	0x6c, 0x65, 0x73, 0x2e, 0x42, 0x75, 0x73, 0x69, 0x52, 0x65, 0x71, 0x1a, 0x16, 0x2e, 0x67, 0x6f,
+	0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e, 0x45, 0x6d,
+	0x70, 0x74, 0x79, 0x22, 0x00, 0x12, 0x3c, 0x0a, 0x0d, 0x54, 0x72, 0x61, 0x6e, 0x73, 0x49, 0x6e,
+	0x52, 0x65, 0x76, 0x65, 0x72, 0x74, 0x12, 0x11, 0x2e, 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65,
+	0x73, 0x2e, 0x42, 0x75, 0x73, 0x69, 0x52, 0x65, 0x71, 0x1a, 0x16, 0x2e, 0x67, 0x6f, 0x6f, 0x67,
+	0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e, 0x45, 0x6d, 0x70, 0x74,
+	0x79, 0x22, 0x00, 0x12, 0x3d, 0x0a, 0x0e, 0x54, 0x72, 0x61, 0x6e, 0x73, 0x4f, 0x75, 0x74, 0x52,
+	0x65, 0x76, 0x65, 0x72, 0x74, 0x12, 0x11, 0x2e, 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x73,
+	0x2e, 0x42, 0x75, 0x73, 0x69, 0x52, 0x65, 0x71, 0x1a, 0x16, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c,
+	0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79,
+	0x22, 0x00, 0x12, 0x3d, 0x0a, 0x0e, 0x54, 0x72, 0x61, 0x6e, 0x73, 0x49, 0x6e, 0x43, 0x6f, 0x6e,
+	0x66, 0x69, 0x72, 0x6d, 0x12, 0x11, 0x2e, 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x73, 0x2e,
 	0x42, 0x75, 0x73, 0x69, 0x52, 0x65, 0x71, 0x1a, 0x16, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65,
 	0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x22,
-	0x00, 0x12, 0x3c, 0x0a, 0x0d, 0x54, 0x72, 0x61, 0x6e, 0x73, 0x49, 0x6e, 0x52, 0x65, 0x76, 0x65,
-	0x72, 0x74, 0x12, 0x11, 0x2e, 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x73, 0x2e, 0x42, 0x75,
+	0x00, 0x12, 0x3e, 0x0a, 0x0f, 0x54, 0x72, 0x61, 0x6e, 0x73, 0x4f, 0x75, 0x74, 0x43, 0x6f, 0x6e,
+	0x66, 0x69, 0x72, 0x6d, 0x12, 0x11, 0x2e, 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x73, 0x2e,
+	0x42, 0x75, 0x73, 0x69, 0x52, 0x65, 0x71, 0x1a, 0x16, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65,
+	0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x22,
+	0x00, 0x12, 0x3c, 0x0a, 0x08, 0x58, 0x61, 0x4e, 0x6f, 0x74, 0x69, 0x66, 0x79, 0x12, 0x16, 0x2e,
+	0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e,
+	0x45, 0x6d, 0x70, 0x74, 0x79, 0x1a, 0x16, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70,
+	0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x22, 0x00, 0x12,
+	0x38, 0x0a, 0x09, 0x54, 0x72, 0x61, 0x6e, 0x73, 0x49, 0x6e, 0x58, 0x61, 0x12, 0x11, 0x2e, 0x65,
+	0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x73, 0x2e, 0x42, 0x75, 0x73, 0x69, 0x52, 0x65, 0x71, 0x1a,
+	0x16, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75,
+	0x66, 0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x22, 0x00, 0x12, 0x39, 0x0a, 0x0a, 0x54, 0x72, 0x61,
+	0x6e, 0x73, 0x4f, 0x75, 0x74, 0x58, 0x61, 0x12, 0x11, 0x2e, 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c,
+	0x65, 0x73, 0x2e, 0x42, 0x75, 0x73, 0x69, 0x52, 0x65, 0x71, 0x1a, 0x16, 0x2e, 0x67, 0x6f, 0x6f,
+	0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e, 0x45, 0x6d, 0x70,
+	0x74, 0x79, 0x22, 0x00, 0x12, 0x39, 0x0a, 0x0a, 0x54, 0x72, 0x61, 0x6e, 0x73, 0x49, 0x6e, 0x54,
+	0x63, 0x63, 0x12, 0x11, 0x2e, 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x73, 0x2e, 0x42, 0x75,
 	0x73, 0x69, 0x52, 0x65, 0x71, 0x1a, 0x16, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70,
 	0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x22, 0x00, 0x12,
-	0x3d, 0x0a, 0x0e, 0x54, 0x72, 0x61, 0x6e, 0x73, 0x4f, 0x75, 0x74, 0x52, 0x65, 0x76, 0x65, 0x72,
-	0x74, 0x12, 0x11, 0x2e, 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x73, 0x2e, 0x42, 0x75, 0x73,
-	0x69, 0x52, 0x65, 0x71, 0x1a, 0x16, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72,
-	0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x22, 0x00, 0x12, 0x3d,
-	0x0a, 0x0e, 0x54, 0x72, 0x61, 0x6e, 0x73, 0x49, 0x6e, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x72, 0x6d,
-	0x12, 0x11, 0x2e, 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x73, 0x2e, 0x42, 0x75, 0x73, 0x69,
-	0x52, 0x65, 0x71, 0x1a, 0x16, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f,
-	0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x22, 0x00, 0x12, 0x3e, 0x0a,
-	0x0f, 0x54, 0x72, 0x61, 0x6e, 0x73, 0x4f, 0x75, 0x74, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x72, 0x6d,
-	0x12, 0x11, 0x2e, 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x73, 0x2e, 0x42, 0x75, 0x73, 0x69,
-	0x52, 0x65, 0x71, 0x1a, 0x16, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f,
-	0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x22, 0x00, 0x12, 0x3c, 0x0a,
-	0x08, 0x58, 0x61, 0x4e, 0x6f, 0x74, 0x69, 0x66, 0x79, 0x12, 0x16, 0x2e, 0x67, 0x6f, 0x6f, 0x67,
-	0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e, 0x45, 0x6d, 0x70, 0x74,
-	0x79, 0x1a, 0x16, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f,
-	0x62, 0x75, 0x66, 0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x22, 0x00, 0x12, 0x38, 0x0a, 0x09, 0x54,
-	0x72, 0x61, 0x6e, 0x73, 0x49, 0x6e, 0x58, 0x61, 0x12, 0x11, 0x2e, 0x65, 0x78, 0x61, 0x6d, 0x70,
-	0x6c, 0x65, 0x73, 0x2e, 0x42, 0x75, 0x73, 0x69, 0x52, 0x65, 0x71, 0x1a, 0x16, 0x2e, 0x67, 0x6f,
-	0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e, 0x45, 0x6d,
-	0x70, 0x74, 0x79, 0x22, 0x00, 0x12, 0x39, 0x0a, 0x0a, 0x54, 0x72, 0x61, 0x6e, 0x73, 0x4f, 0x75,
-	0x74, 0x58, 0x61, 0x12, 0x11, 0x2e, 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x73, 0x2e, 0x42,
-	0x75, 0x73, 0x69, 0x52, 0x65, 0x71, 0x1a, 0x16, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e,
-	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x22, 0x00,
-	0x12, 0x39, 0x0a, 0x0a, 0x54, 0x72, 0x61, 0x6e, 0x73, 0x49, 0x6e, 0x54, 0x63, 0x63, 0x12, 0x11,
+	0x3a, 0x0a, 0x0b, 0x54, 0x72, 0x61, 0x6e, 0x73, 0x4f, 0x75, 0x74, 0x54, 0x63, 0x63, 0x12, 0x11,
 	0x2e, 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x73, 0x2e, 0x42, 0x75, 0x73, 0x69, 0x52, 0x65,
 	0x71, 0x1a, 0x16, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f,
-	0x62, 0x75, 0x66, 0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x22, 0x00, 0x12, 0x3a, 0x0a, 0x0b, 0x54,
-	0x72, 0x61, 0x6e, 0x73, 0x4f, 0x75, 0x74, 0x54, 0x63, 0x63, 0x12, 0x11, 0x2e, 0x65, 0x78, 0x61,
+	0x62, 0x75, 0x66, 0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x22, 0x00, 0x12, 0x3f, 0x0a, 0x10, 0x54,
+	0x72, 0x61, 0x6e, 0x73, 0x49, 0x6e, 0x54, 0x63, 0x63, 0x4e, 0x65, 0x73, 0x74, 0x65, 0x64, 0x12,
+	0x11, 0x2e, 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x73, 0x2e, 0x42, 0x75, 0x73, 0x69, 0x52,
+	0x65, 0x71, 0x1a, 0x16, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74,
+	0x6f, 0x62, 0x75, 0x66, 0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x22, 0x00, 0x12, 0x3b, 0x0a, 0x0c,
+	0x54, 0x72, 0x61, 0x6e, 0x73, 0x49, 0x6e, 0x42, 0x53, 0x61, 0x67, 0x61, 0x12, 0x11, 0x2e, 0x65,
+	0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x73, 0x2e, 0x42, 0x75, 0x73, 0x69, 0x52, 0x65, 0x71, 0x1a,
+	0x16, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75,
+	0x66, 0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x22, 0x00, 0x12, 0x3c, 0x0a, 0x0d, 0x54, 0x72, 0x61,
+	0x6e, 0x73, 0x4f, 0x75, 0x74, 0x42, 0x53, 0x61, 0x67, 0x61, 0x12, 0x11, 0x2e, 0x65, 0x78, 0x61,
 	0x6d, 0x70, 0x6c, 0x65, 0x73, 0x2e, 0x42, 0x75, 0x73, 0x69, 0x52, 0x65, 0x71, 0x1a, 0x16, 0x2e,
 	0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e,
-	0x45, 0x6d, 0x70, 0x74, 0x79, 0x22, 0x00, 0x12, 0x3f, 0x0a, 0x10, 0x54, 0x72, 0x61, 0x6e, 0x73,
-	0x49, 0x6e, 0x54, 0x63, 0x63, 0x4e, 0x65, 0x73, 0x74, 0x65, 0x64, 0x12, 0x11, 0x2e, 0x65, 0x78,
-	0x61, 0x6d, 0x70, 0x6c, 0x65, 0x73, 0x2e, 0x42, 0x75, 0x73, 0x69, 0x52, 0x65, 0x71, 0x1a, 0x16,
-	0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66,
-	0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x22, 0x00, 0x12, 0x3b, 0x0a, 0x0c, 0x54, 0x72, 0x61, 0x6e,
-	0x73, 0x49, 0x6e, 0x42, 0x53, 0x61, 0x67, 0x61, 0x12, 0x11, 0x2e, 0x65, 0x78, 0x61, 0x6d, 0x70,
-	0x6c, 0x65, 0x73, 0x2e, 0x42, 0x75, 0x73, 0x69, 0x52, 0x65, 0x71, 0x1a, 0x16, 0x2e, 0x67, 0x6f,
-	0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e, 0x45, 0x6d,
-	0x70, 0x74, 0x79, 0x22, 0x00, 0x12, 0x3c, 0x0a, 0x0d, 0x54, 0x72, 0x61, 0x6e, 0x73, 0x4f, 0x75,
-	0x74, 0x42, 0x53, 0x61, 0x67, 0x61, 0x12, 0x11, 0x2e, 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65,
-	0x73, 0x2e, 0x42, 0x75, 0x73, 0x69, 0x52, 0x65, 0x71, 0x1a, 0x16, 0x2e, 0x67, 0x6f, 0x6f, 0x67,
-	0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e, 0x45, 0x6d, 0x70, 0x74,
-	0x79, 0x22, 0x00, 0x12, 0x41, 0x0a, 0x12, 0x54, 0x72, 0x61, 0x6e, 0x73, 0x49, 0x6e, 0x52, 0x65,
-	0x76, 0x65, 0x72, 0x74, 0x42, 0x53, 0x61, 0x67, 0x61, 0x12, 0x11, 0x2e, 0x65, 0x78, 0x61, 0x6d,
-	0x70, 0x6c, 0x65, 0x73, 0x2e, 0x42, 0x75, 0x73, 0x69, 0x52, 0x65, 0x71, 0x1a, 0x16, 0x2e, 0x67,
-	0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e, 0x45,
-	0x6d, 0x70, 0x74, 0x79, 0x22, 0x00, 0x12, 0x42, 0x0a, 0x13, 0x54, 0x72, 0x61, 0x6e, 0x73, 0x4f,
-	0x75, 0x74, 0x52, 0x65, 0x76, 0x65, 0x72, 0x74, 0x42, 0x53, 0x61, 0x67, 0x61, 0x12, 0x11, 0x2e,
+	0x45, 0x6d, 0x70, 0x74, 0x79, 0x22, 0x00, 0x12, 0x41, 0x0a, 0x12, 0x54, 0x72, 0x61, 0x6e, 0x73,
+	0x49, 0x6e, 0x52, 0x65, 0x76, 0x65, 0x72, 0x74, 0x42, 0x53, 0x61, 0x67, 0x61, 0x12, 0x11, 0x2e,
 	0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x73, 0x2e, 0x42, 0x75, 0x73, 0x69, 0x52, 0x65, 0x71,
 	0x1a, 0x16, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62,
-	0x75, 0x66, 0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x22, 0x00, 0x42, 0x0c, 0x5a, 0x0a, 0x2e, 0x2f,
-	0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x73, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+	0x75, 0x66, 0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x22, 0x00, 0x12, 0x42, 0x0a, 0x13, 0x54, 0x72,
+	0x61, 0x6e, 0x73, 0x4f, 0x75, 0x74, 0x52, 0x65, 0x76, 0x65, 0x72, 0x74, 0x42, 0x53, 0x61, 0x67,
+	0x61, 0x12, 0x11, 0x2e, 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x73, 0x2e, 0x42, 0x75, 0x73,
+	0x69, 0x52, 0x65, 0x71, 0x1a, 0x16, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72,
+	0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x22, 0x00, 0x42, 0x0c,
+	0x5a, 0x0a, 0x2e, 0x2f, 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x73, 0x62, 0x06, 0x70, 0x72,
+	0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -186,10 +230,11 @@ func file_examples_busi_proto_rawDescGZIP() []byte {
 	return file_examples_busi_proto_rawDescData
 }
 
-var file_examples_busi_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_examples_busi_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
 var file_examples_busi_proto_goTypes = []interface{}{
 	(*BusiReq)(nil),       // 0: examples.BusiReq
-	(*emptypb.Empty)(nil), // 1: google.protobuf.Empty
+	(*BusiReply)(nil),     // 1: examples.BusiReply
+	(*emptypb.Empty)(nil), // 2: google.protobuf.Empty
 }
 var file_examples_busi_proto_depIdxs = []int32{
 	0,  // 0: examples.Busi.CanSubmit:input_type -> examples.BusiReq
@@ -199,7 +244,7 @@ var file_examples_busi_proto_depIdxs = []int32{
 	0,  // 4: examples.Busi.TransOutRevert:input_type -> examples.BusiReq
 	0,  // 5: examples.Busi.TransInConfirm:input_type -> examples.BusiReq
 	0,  // 6: examples.Busi.TransOutConfirm:input_type -> examples.BusiReq
-	1,  // 7: examples.Busi.XaNotify:input_type -> google.protobuf.Empty
+	2,  // 7: examples.Busi.XaNotify:input_type -> google.protobuf.Empty
 	0,  // 8: examples.Busi.TransInXa:input_type -> examples.BusiReq
 	0,  // 9: examples.Busi.TransOutXa:input_type -> examples.BusiReq
 	0,  // 10: examples.Busi.TransInTcc:input_type -> examples.BusiReq
@@ -209,23 +254,23 @@ var file_examples_busi_proto_depIdxs = []int32{
 	0,  // 14: examples.Busi.TransOutBSaga:input_type -> examples.BusiReq
 	0,  // 15: examples.Busi.TransInRevertBSaga:input_type -> examples.BusiReq
 	0,  // 16: examples.Busi.TransOutRevertBSaga:input_type -> examples.BusiReq
-	1,  // 17: examples.Busi.CanSubmit:output_type -> google.protobuf.Empty
-	1,  // 18: examples.Busi.TransIn:output_type -> google.protobuf.Empty
-	1,  // 19: examples.Busi.TransOut:output_type -> google.protobuf.Empty
-	1,  // 20: examples.Busi.TransInRevert:output_type -> google.protobuf.Empty
-	1,  // 21: examples.Busi.TransOutRevert:output_type -> google.protobuf.Empty
-	1,  // 22: examples.Busi.TransInConfirm:output_type -> google.protobuf.Empty
-	1,  // 23: examples.Busi.TransOutConfirm:output_type -> google.protobuf.Empty
-	1,  // 24: examples.Busi.XaNotify:output_type -> google.protobuf.Empty
-	1,  // 25: examples.Busi.TransInXa:output_type -> google.protobuf.Empty
-	1,  // 26: examples.Busi.TransOutXa:output_type -> google.protobuf.Empty
-	1,  // 27: examples.Busi.TransInTcc:output_type -> google.protobuf.Empty
-	1,  // 28: examples.Busi.TransOutTcc:output_type -> google.protobuf.Empty
-	1,  // 29: examples.Busi.TransInTccNested:output_type -> google.protobuf.Empty
-	1,  // 30: examples.Busi.TransInBSaga:output_type -> google.protobuf.Empty
-	1,  // 31: examples.Busi.TransOutBSaga:output_type -> google.protobuf.Empty
-	1,  // 32: examples.Busi.TransInRevertBSaga:output_type -> google.protobuf.Empty
-	1,  // 33: examples.Busi.TransOutRevertBSaga:output_type -> google.protobuf.Empty
+	1,  // 17: examples.Busi.CanSubmit:output_type -> examples.BusiReply
+	2,  // 18: examples.Busi.TransIn:output_type -> google.protobuf.Empty
+	2,  // 19: examples.Busi.TransOut:output_type -> google.protobuf.Empty
+	2,  // 20: examples.Busi.TransInRevert:output_type -> google.protobuf.Empty
+	2,  // 21: examples.Busi.TransOutRevert:output_type -> google.protobuf.Empty
+	2,  // 22: examples.Busi.TransInConfirm:output_type -> google.protobuf.Empty
+	2,  // 23: examples.Busi.TransOutConfirm:output_type -> google.protobuf.Empty
+	2,  // 24: examples.Busi.XaNotify:output_type -> google.protobuf.Empty
+	2,  // 25: examples.Busi.TransInXa:output_type -> google.protobuf.Empty
+	2,  // 26: examples.Busi.TransOutXa:output_type -> google.protobuf.Empty
+	2,  // 27: examples.Busi.TransInTcc:output_type -> google.protobuf.Empty
+	2,  // 28: examples.Busi.TransOutTcc:output_type -> google.protobuf.Empty
+	2,  // 29: examples.Busi.TransInTccNested:output_type -> google.protobuf.Empty
+	2,  // 30: examples.Busi.TransInBSaga:output_type -> google.protobuf.Empty
+	2,  // 31: examples.Busi.TransOutBSaga:output_type -> google.protobuf.Empty
+	2,  // 32: examples.Busi.TransInRevertBSaga:output_type -> google.protobuf.Empty
+	2,  // 33: examples.Busi.TransOutRevertBSaga:output_type -> google.protobuf.Empty
 	17, // [17:34] is the sub-list for method output_type
 	0,  // [0:17] is the sub-list for method input_type
 	0,  // [0:0] is the sub-list for extension type_name
@@ -251,6 +296,18 @@ func file_examples_busi_proto_init() {
 				return nil
 			}
 		}
+		file_examples_busi_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*BusiReply); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
 	}
 	type x struct{}
 	out := protoimpl.TypeBuilder{
@@ -258,7 +315,7 @@ func file_examples_busi_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_examples_busi_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   1,
+			NumMessages:   2,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
diff --git a/examples/busi.proto b/examples/busi.proto
index 9ae5f1c..8e34fa8 100644
--- a/examples/busi.proto
+++ b/examples/busi.proto
@@ -12,9 +12,12 @@ message BusiReq {
   string TransInResult = 3;
 }
 
+message BusiReply {
+  string message = 1;
+}
 // The dtm service definition.
 service Busi {
-  rpc CanSubmit(BusiReq) returns (google.protobuf.Empty) {}
+  rpc CanSubmit(BusiReq) returns (BusiReply) {}
   rpc TransIn(BusiReq) returns (google.protobuf.Empty) {}
   rpc TransOut(BusiReq) returns (google.protobuf.Empty) {}
   rpc TransInRevert(BusiReq) returns (google.protobuf.Empty) {}
diff --git a/examples/busi_grpc.pb.go b/examples/busi_grpc.pb.go
index eb67476..f9e9427 100644
--- a/examples/busi_grpc.pb.go
+++ b/examples/busi_grpc.pb.go
@@ -1,9 +1,3 @@
-/*
- * Copyright (c) 2021 yedf. All rights reserved.
- * Use of this source code is governed by a BSD-style
- * license that can be found in the LICENSE file.
- */
-
 // Code generated by protoc-gen-go-grpc. DO NOT EDIT.
 
 package examples
@@ -25,7 +19,7 @@ const _ = grpc.SupportPackageIsVersion7
 //
 // For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
 type BusiClient interface {
-	CanSubmit(ctx context.Context, in *BusiReq, opts ...grpc.CallOption) (*emptypb.Empty, error)
+	CanSubmit(ctx context.Context, in *BusiReq, opts ...grpc.CallOption) (*BusiReply, error)
 	TransIn(ctx context.Context, in *BusiReq, opts ...grpc.CallOption) (*emptypb.Empty, error)
 	TransOut(ctx context.Context, in *BusiReq, opts ...grpc.CallOption) (*emptypb.Empty, error)
 	TransInRevert(ctx context.Context, in *BusiReq, opts ...grpc.CallOption) (*emptypb.Empty, error)
@@ -52,8 +46,8 @@ func NewBusiClient(cc grpc.ClientConnInterface) BusiClient {
 	return &busiClient{cc}
 }
 
-func (c *busiClient) CanSubmit(ctx context.Context, in *BusiReq, opts ...grpc.CallOption) (*emptypb.Empty, error) {
-	out := new(emptypb.Empty)
+func (c *busiClient) CanSubmit(ctx context.Context, in *BusiReq, opts ...grpc.CallOption) (*BusiReply, error) {
+	out := new(BusiReply)
 	err := c.cc.Invoke(ctx, "/examples.Busi/CanSubmit", in, out, opts...)
 	if err != nil {
 		return nil, err
@@ -209,7 +203,7 @@ func (c *busiClient) TransOutRevertBSaga(ctx context.Context, in *BusiReq, opts
 // All implementations must embed UnimplementedBusiServer
 // for forward compatibility
 type BusiServer interface {
-	CanSubmit(context.Context, *BusiReq) (*emptypb.Empty, error)
+	CanSubmit(context.Context, *BusiReq) (*BusiReply, error)
 	TransIn(context.Context, *BusiReq) (*emptypb.Empty, error)
 	TransOut(context.Context, *BusiReq) (*emptypb.Empty, error)
 	TransInRevert(context.Context, *BusiReq) (*emptypb.Empty, error)
@@ -233,7 +227,7 @@ type BusiServer interface {
 type UnimplementedBusiServer struct {
 }
 
-func (UnimplementedBusiServer) CanSubmit(context.Context, *BusiReq) (*emptypb.Empty, error) {
+func (UnimplementedBusiServer) CanSubmit(context.Context, *BusiReq) (*BusiReply, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method CanSubmit not implemented")
 }
 func (UnimplementedBusiServer) TransIn(context.Context, *BusiReq) (*emptypb.Empty, error) {