diff --git a/example/shorturl/api/etc/shorturl-api.yaml b/example/shorturl/api/etc/shorturl-api.yaml
new file mode 100644
index 00000000..b0ff569b
--- /dev/null
+++ b/example/shorturl/api/etc/shorturl-api.yaml
@@ -0,0 +1,3 @@
+Name: shorturl-api
+Host: 0.0.0.0
+Port: 8888
diff --git a/example/shorturl/api/internal/config/config.go b/example/shorturl/api/internal/config/config.go
new file mode 100644
index 00000000..5dc7bd76
--- /dev/null
+++ b/example/shorturl/api/internal/config/config.go
@@ -0,0 +1,7 @@
+package config
+
+import "github.com/tal-tech/go-zero/rest"
+
+type Config struct {
+	rest.RestConf
+}
diff --git a/example/shorturl/api/internal/handler/expandhandler.go b/example/shorturl/api/internal/handler/expandhandler.go
new file mode 100644
index 00000000..d42b2d75
--- /dev/null
+++ b/example/shorturl/api/internal/handler/expandhandler.go
@@ -0,0 +1,29 @@
+package handler
+
+import (
+	"net/http"
+
+	"shorturl/api/internal/logic"
+	"shorturl/api/internal/svc"
+	"shorturl/api/internal/types"
+
+	"github.com/tal-tech/go-zero/rest/httpx"
+)
+
+func expandHandler(ctx *svc.ServiceContext) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		var req types.ExpandReq
+		if err := httpx.Parse(r, &req); err != nil {
+			httpx.Error(w, err)
+			return
+		}
+
+		l := logic.NewExpandLogic(r.Context(), ctx)
+		resp, err := l.Expand(req)
+		if err != nil {
+			httpx.Error(w, err)
+		} else {
+			httpx.WriteJson(w, http.StatusOK, resp)
+		}
+	}
+}
diff --git a/example/shorturl/api/internal/handler/routes.go b/example/shorturl/api/internal/handler/routes.go
new file mode 100644
index 00000000..8fb94695
--- /dev/null
+++ b/example/shorturl/api/internal/handler/routes.go
@@ -0,0 +1,25 @@
+// DO NOT EDIT, generated by goctl
+package handler
+
+import (
+	"net/http"
+
+	"shorturl/api/internal/svc"
+
+	"github.com/tal-tech/go-zero/rest"
+)
+
+func RegisterHandlers(engine *rest.Server, serverCtx *svc.ServiceContext) {
+	engine.AddRoutes([]rest.Route{
+		{
+			Method:  http.MethodGet,
+			Path:    "/shorten",
+			Handler: shortenHandler(serverCtx),
+		},
+		{
+			Method:  http.MethodGet,
+			Path:    "/expand",
+			Handler: expandHandler(serverCtx),
+		},
+	})
+}
diff --git a/example/shorturl/api/internal/handler/shortenhandler.go b/example/shorturl/api/internal/handler/shortenhandler.go
new file mode 100644
index 00000000..81197005
--- /dev/null
+++ b/example/shorturl/api/internal/handler/shortenhandler.go
@@ -0,0 +1,29 @@
+package handler
+
+import (
+	"net/http"
+
+	"shorturl/api/internal/logic"
+	"shorturl/api/internal/svc"
+	"shorturl/api/internal/types"
+
+	"github.com/tal-tech/go-zero/rest/httpx"
+)
+
+func shortenHandler(ctx *svc.ServiceContext) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		var req types.ShortenReq
+		if err := httpx.Parse(r, &req); err != nil {
+			httpx.Error(w, err)
+			return
+		}
+
+		l := logic.NewShortenLogic(r.Context(), ctx)
+		resp, err := l.Shorten(req)
+		if err != nil {
+			httpx.Error(w, err)
+		} else {
+			httpx.WriteJson(w, http.StatusOK, resp)
+		}
+	}
+}
diff --git a/example/shorturl/api/internal/logic/expandlogic.go b/example/shorturl/api/internal/logic/expandlogic.go
new file mode 100644
index 00000000..071f1cd7
--- /dev/null
+++ b/example/shorturl/api/internal/logic/expandlogic.go
@@ -0,0 +1,26 @@
+package logic
+
+import (
+	"context"
+
+	"shorturl/api/internal/svc"
+	"shorturl/api/internal/types"
+
+	"github.com/tal-tech/go-zero/core/logx"
+)
+
+type ExpandLogic struct {
+	ctx context.Context
+	logx.Logger
+}
+
+func NewExpandLogic(ctx context.Context, svcCtx *svc.ServiceContext) ExpandLogic {
+	return ExpandLogic{
+		ctx:    ctx,
+		Logger: logx.WithContext(ctx),
+	}
+}
+
+func (l *ExpandLogic) Expand(req types.ExpandReq) (*types.ExpandResp, error) {
+	return &types.ExpandResp{}, nil
+}
diff --git a/example/shorturl/api/internal/logic/shortenlogic.go b/example/shorturl/api/internal/logic/shortenlogic.go
new file mode 100644
index 00000000..e386b373
--- /dev/null
+++ b/example/shorturl/api/internal/logic/shortenlogic.go
@@ -0,0 +1,26 @@
+package logic
+
+import (
+	"context"
+
+	"shorturl/api/internal/svc"
+	"shorturl/api/internal/types"
+
+	"github.com/tal-tech/go-zero/core/logx"
+)
+
+type ShortenLogic struct {
+	ctx context.Context
+	logx.Logger
+}
+
+func NewShortenLogic(ctx context.Context, svcCtx *svc.ServiceContext) ShortenLogic {
+	return ShortenLogic{
+		ctx:    ctx,
+		Logger: logx.WithContext(ctx),
+	}
+}
+
+func (l *ShortenLogic) Shorten(req types.ShortenReq) (*types.ShortenResp, error) {
+	return &types.ShortenResp{}, nil
+}
diff --git a/example/shorturl/api/internal/svc/servicecontext.go b/example/shorturl/api/internal/svc/servicecontext.go
new file mode 100644
index 00000000..e42c0efe
--- /dev/null
+++ b/example/shorturl/api/internal/svc/servicecontext.go
@@ -0,0 +1,11 @@
+package svc
+
+import "shorturl/api/internal/config"
+
+type ServiceContext struct {
+	Config config.Config
+}
+
+func NewServiceContext(c config.Config) *ServiceContext {
+	return &ServiceContext{Config: c}
+}
diff --git a/example/shorturl/api/internal/types/types.go b/example/shorturl/api/internal/types/types.go
new file mode 100644
index 00000000..47bf216e
--- /dev/null
+++ b/example/shorturl/api/internal/types/types.go
@@ -0,0 +1,18 @@
+// DO NOT EDIT, generated by goctl
+package types
+
+type ExpandReq struct {
+	Shorten string `form:"shorten"`
+}
+
+type ExpandResp struct {
+	Url string `json:"url"`
+}
+
+type ShortenReq struct {
+	Url string `form:"url"`
+}
+
+type ShortenResp struct {
+	Shorten string `json:"shorten"`
+}
diff --git a/example/shorturl/api/shorturl.api b/example/shorturl/api/shorturl.api
new file mode 100644
index 00000000..7112f5f8
--- /dev/null
+++ b/example/shorturl/api/shorturl.api
@@ -0,0 +1,33 @@
+
+
+type (
+	expandReq struct {
+		shorten string `form:"shorten"`
+	}
+
+	expandResp struct {
+		url string `json:"url"`
+	}
+)
+
+type (
+	shortenReq struct {
+		url string `form:"url"`
+	}
+
+	shortenResp struct {
+		shorten string `json:"shorten"`
+	}
+)
+
+service shorturl-api {
+	@server(
+		handler: ShortenHandler
+	)
+	get /shorten(shortenReq) returns(shortenResp)
+
+	@server(
+		handler: ExpandHandler
+	)
+	get /expand(expandReq) returns(expandResp)
+}
\ No newline at end of file
diff --git a/example/shorturl/api/shorturl.go b/example/shorturl/api/shorturl.go
new file mode 100644
index 00000000..9f857758
--- /dev/null
+++ b/example/shorturl/api/shorturl.go
@@ -0,0 +1,28 @@
+package main
+
+import (
+	"flag"
+
+	"shorturl/api/internal/config"
+	"shorturl/api/internal/handler"
+	"shorturl/api/internal/svc"
+
+	"github.com/tal-tech/go-zero/core/conf"
+	"github.com/tal-tech/go-zero/rest"
+)
+
+var configFile = flag.String("f", "etc/shorturl-api.yaml", "the config file")
+
+func main() {
+	flag.Parse()
+
+	var c config.Config
+	conf.MustLoad(*configFile, &c)
+
+	ctx := svc.NewServiceContext(c)
+	server := rest.MustNewServer(c.RestConf)
+	defer server.Stop()
+
+	handler.RegisterHandlers(server, ctx)
+	server.Start()
+}
diff --git a/example/shorturl/go.mod b/example/shorturl/go.mod
new file mode 100644
index 00000000..beebf1d4
--- /dev/null
+++ b/example/shorturl/go.mod
@@ -0,0 +1,11 @@
+module shorturl
+
+go 1.15
+
+require (
+	github.com/golang/mock v1.4.3
+	github.com/golang/protobuf v1.4.2
+	github.com/tal-tech/go-zero v1.0.7
+	golang.org/x/net v0.0.0-20200707034311-ab3426394381
+	google.golang.org/grpc v1.29.1
+)
diff --git a/example/shorturl/go.sum b/example/shorturl/go.sum
new file mode 100644
index 00000000..6b2c2ea6
--- /dev/null
+++ b/example/shorturl/go.sum
@@ -0,0 +1,360 @@
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diff --git a/example/shorturl/rpc/transform/etc/transform.yaml b/example/shorturl/rpc/transform/etc/transform.yaml
new file mode 100755
index 00000000..ff855c7c
--- /dev/null
+++ b/example/shorturl/rpc/transform/etc/transform.yaml
@@ -0,0 +1,12 @@
+Name: transform.rpc
+Log:
+  Mode: console
+ListenOn: 127.0.0.1:8081
+Etcd:
+  Hosts:
+  - 127.0.0.1:2379
+  Key: transform.rpc
+DataSource: root:@tcp(localhost:3306)/gozero
+Table: shorturl
+Cache:
+  - Host: localhost:6379
diff --git a/example/shorturl/rpc/transform/internal/config/config.go b/example/shorturl/rpc/transform/internal/config/config.go
new file mode 100755
index 00000000..84d795de
--- /dev/null
+++ b/example/shorturl/rpc/transform/internal/config/config.go
@@ -0,0 +1,13 @@
+package config
+
+import (
+	"github.com/tal-tech/go-zero/core/stores/cache"
+	"github.com/tal-tech/go-zero/rpcx"
+)
+
+type Config struct {
+	rpcx.RpcServerConf
+	DataSource string
+	Table      string
+	Cache      cache.CacheConf
+}
diff --git a/example/shorturl/rpc/transform/internal/logic/expandlogic.go b/example/shorturl/rpc/transform/internal/logic/expandlogic.go
new file mode 100755
index 00000000..870e307c
--- /dev/null
+++ b/example/shorturl/rpc/transform/internal/logic/expandlogic.go
@@ -0,0 +1,35 @@
+package logic
+
+import (
+	"context"
+
+	"shorturl/rpc/transform/internal/svc"
+	transform "shorturl/rpc/transform/pb"
+
+	"github.com/tal-tech/go-zero/core/logx"
+)
+
+type ExpandLogic struct {
+	ctx    context.Context
+	svcCtx *svc.ServiceContext
+	logx.Logger
+}
+
+func NewExpandLogic(ctx context.Context, svcCtx *svc.ServiceContext) *ExpandLogic {
+	return &ExpandLogic{
+		ctx:    ctx,
+		svcCtx: svcCtx,
+		Logger: logx.WithContext(ctx),
+	}
+}
+
+func (l *ExpandLogic) Expand(in *transform.ExpandReq) (*transform.ExpandResp, error) {
+	res, err := l.svcCtx.Model.FindOne(in.Shorten)
+	if err != nil {
+		return nil, err
+	}
+
+	return &transform.ExpandResp{
+		Url: res.Url,
+	}, nil
+}
diff --git a/example/shorturl/rpc/transform/internal/logic/shortenlogic.go b/example/shorturl/rpc/transform/internal/logic/shortenlogic.go
new file mode 100755
index 00000000..2da00849
--- /dev/null
+++ b/example/shorturl/rpc/transform/internal/logic/shortenlogic.go
@@ -0,0 +1,41 @@
+package logic
+
+import (
+	"context"
+
+	"shorturl/rpc/transform/internal/svc"
+	"shorturl/rpc/transform/model"
+	transform "shorturl/rpc/transform/pb"
+
+	"github.com/tal-tech/go-zero/core/hash"
+	"github.com/tal-tech/go-zero/core/logx"
+)
+
+type ShortenLogic struct {
+	ctx    context.Context
+	svcCtx *svc.ServiceContext
+	logx.Logger
+}
+
+func NewShortenLogic(ctx context.Context, svcCtx *svc.ServiceContext) *ShortenLogic {
+	return &ShortenLogic{
+		ctx:    ctx,
+		svcCtx: svcCtx,
+		Logger: logx.WithContext(ctx),
+	}
+}
+
+func (l *ShortenLogic) Shorten(in *transform.ShortenReq) (*transform.ShortenResp, error) {
+	key := hash.Md5Hex([]byte(in.Url))[:6]
+	_, err := l.svcCtx.Model.Insert(model.Shorturl{
+		Shorten: key,
+		Url:     in.Url,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	return &transform.ShortenResp{
+		Shorten: key,
+	}, nil
+}
diff --git a/example/shorturl/rpc/transform/internal/server/transformerserver.go b/example/shorturl/rpc/transform/internal/server/transformerserver.go
new file mode 100755
index 00000000..c06e365a
--- /dev/null
+++ b/example/shorturl/rpc/transform/internal/server/transformerserver.go
@@ -0,0 +1,32 @@
+// Code generated by goctl. DO NOT EDIT!
+// Source: transform.proto
+
+package server
+
+import (
+	"context"
+
+	"shorturl/rpc/transform/internal/logic"
+	"shorturl/rpc/transform/internal/svc"
+	transform "shorturl/rpc/transform/pb"
+)
+
+type TransformerServer struct {
+	svcCtx *svc.ServiceContext
+}
+
+func NewTransformerServer(svcCtx *svc.ServiceContext) *TransformerServer {
+	return &TransformerServer{
+		svcCtx: svcCtx,
+	}
+}
+
+func (s *TransformerServer) Expand(ctx context.Context, in *transform.ExpandReq) (*transform.ExpandResp, error) {
+	l := logic.NewExpandLogic(ctx, s.svcCtx)
+	return l.Expand(in)
+}
+
+func (s *TransformerServer) Shorten(ctx context.Context, in *transform.ShortenReq) (*transform.ShortenResp, error) {
+	l := logic.NewShortenLogic(ctx, s.svcCtx)
+	return l.Shorten(in)
+}
diff --git a/example/shorturl/rpc/transform/internal/svc/servicecontext.go b/example/shorturl/rpc/transform/internal/svc/servicecontext.go
new file mode 100755
index 00000000..995fba79
--- /dev/null
+++ b/example/shorturl/rpc/transform/internal/svc/servicecontext.go
@@ -0,0 +1,20 @@
+package svc
+
+import (
+	"shorturl/rpc/transform/internal/config"
+	"shorturl/rpc/transform/model"
+
+	"github.com/tal-tech/go-zero/core/stores/sqlx"
+)
+
+type ServiceContext struct {
+	c     config.Config
+	Model *model.ShorturlModel
+}
+
+func NewServiceContext(c config.Config) *ServiceContext {
+	return &ServiceContext{
+		c:     c,
+		Model: model.NewShorturlModel(sqlx.NewMysql(c.DataSource), c.Cache, c.Table),
+	}
+}
diff --git a/example/shorturl/rpc/transform/model/shorturl.sql b/example/shorturl/rpc/transform/model/shorturl.sql
new file mode 100644
index 00000000..8c50e9cf
--- /dev/null
+++ b/example/shorturl/rpc/transform/model/shorturl.sql
@@ -0,0 +1,6 @@
+CREATE TABLE `shorturl`
+(
+  `shorten` varchar(255) NOT NULL COMMENT 'shorten key',
+  `url` varchar(255) NOT NULL COMMENT 'original url',
+  PRIMARY KEY(`shorten`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
diff --git a/example/shorturl/rpc/transform/model/shorturlmodel.go b/example/shorturl/rpc/transform/model/shorturlmodel.go
new file mode 100755
index 00000000..d20f8366
--- /dev/null
+++ b/example/shorturl/rpc/transform/model/shorturlmodel.go
@@ -0,0 +1,86 @@
+package model
+
+import (
+	"database/sql"
+	"fmt"
+	"strings"
+
+	"github.com/tal-tech/go-zero/core/stores/cache"
+	"github.com/tal-tech/go-zero/core/stores/sqlc"
+	"github.com/tal-tech/go-zero/core/stores/sqlx"
+	"github.com/tal-tech/go-zero/core/stringx"
+	"github.com/tal-tech/go-zero/tools/goctl/model/sql/builderx"
+)
+
+var (
+	shorturlFieldNames          = builderx.FieldNames(&Shorturl{})
+	shorturlRows                = strings.Join(shorturlFieldNames, ",")
+	shorturlRowsExpectAutoSet   = strings.Join(stringx.Remove(shorturlFieldNames, "create_time", "update_time"), ",")
+	shorturlRowsWithPlaceHolder = strings.Join(stringx.Remove(shorturlFieldNames, "shorten", "create_time", "update_time"), "=?,") + "=?"
+
+	cacheShorturlShortenPrefix = "cache#Shorturl#shorten#"
+)
+
+type (
+	ShorturlModel struct {
+		sqlc.CachedConn
+		table string
+	}
+
+	Shorturl struct {
+		Shorten string `db:"shorten"` // shorten key
+		Url     string `db:"url"`     // original url
+	}
+)
+
+func NewShorturlModel(conn sqlx.SqlConn, c cache.CacheConf, table string) *ShorturlModel {
+	return &ShorturlModel{
+		CachedConn: sqlc.NewConn(conn, c),
+		table:      table,
+	}
+}
+
+func (m *ShorturlModel) Insert(data Shorturl) (sql.Result, error) {
+	query := `insert into ` + m.table + ` (` + shorturlRowsExpectAutoSet + `) values (?, ?)`
+	return m.ExecNoCache(query, data.Shorten, data.Url)
+}
+
+func (m *ShorturlModel) FindOne(shorten string) (*Shorturl, error) {
+	shorturlShortenKey := fmt.Sprintf("%s%v", cacheShorturlShortenPrefix, shorten)
+	var resp Shorturl
+	err := m.QueryRow(&resp, shorturlShortenKey, func(conn sqlx.SqlConn, v interface{}) error {
+		query := `select ` + shorturlRows + ` from ` + m.table + ` where shorten = ? limit 1`
+		return conn.QueryRow(v, query, shorten)
+	})
+	switch err {
+	case nil:
+		return &resp, nil
+	case sqlc.ErrNotFound:
+		return nil, ErrNotFound
+	default:
+		return nil, err
+	}
+}
+
+func (m *ShorturlModel) Update(data Shorturl) error {
+	shorturlShortenKey := fmt.Sprintf("%s%v", cacheShorturlShortenPrefix, data.Shorten)
+	_, err := m.Exec(func(conn sqlx.SqlConn) (result sql.Result, err error) {
+		query := `update ` + m.table + ` set ` + shorturlRowsWithPlaceHolder + ` where shorten = ?`
+		return conn.Exec(query, data.Url, data.Shorten)
+	}, shorturlShortenKey)
+	return err
+}
+
+func (m *ShorturlModel) Delete(shorten string) error {
+	_, err := m.FindOne(shorten)
+	if err != nil {
+		return err
+	}
+
+	shorturlShortenKey := fmt.Sprintf("%s%v", cacheShorturlShortenPrefix, shorten)
+	_, err = m.Exec(func(conn sqlx.SqlConn) (result sql.Result, err error) {
+		query := `delete from ` + m.table + ` where shorten = ?`
+		return conn.Exec(query, shorten)
+	}, shorturlShortenKey)
+	return err
+}
diff --git a/example/shorturl/rpc/transform/model/vars.go b/example/shorturl/rpc/transform/model/vars.go
new file mode 100755
index 00000000..b7a5e88f
--- /dev/null
+++ b/example/shorturl/rpc/transform/model/vars.go
@@ -0,0 +1,5 @@
+package model
+
+import "github.com/tal-tech/go-zero/core/stores/sqlx"
+
+var ErrNotFound = sqlx.ErrNotFound
diff --git a/example/shorturl/rpc/transform/pb/transform.pb.go b/example/shorturl/rpc/transform/pb/transform.pb.go
new file mode 100644
index 00000000..f9b5edf1
--- /dev/null
+++ b/example/shorturl/rpc/transform/pb/transform.pb.go
@@ -0,0 +1,230 @@
+// Code generated by protoc-gen-go.
+// source: transform.proto
+// DO NOT EDIT!
+
+/*
+Package transform is a generated protocol buffer package.
+
+It is generated from these files:
+	transform.proto
+
+It has these top-level messages:
+	ExpandReq
+	ExpandResp
+	ShortenReq
+	ShortenResp
+*/
+package transform
+
+import proto "github.com/golang/protobuf/proto"
+import fmt "fmt"
+import math "math"
+
+import (
+	context "golang.org/x/net/context"
+	grpc "google.golang.org/grpc"
+)
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.ProtoPackageIsVersion2 // please upgrade the proto package
+
+type ExpandReq struct {
+	Shorten string `protobuf:"bytes,1,opt,name=shorten" json:"shorten,omitempty"`
+}
+
+func (m *ExpandReq) Reset()                    { *m = ExpandReq{} }
+func (m *ExpandReq) String() string            { return proto.CompactTextString(m) }
+func (*ExpandReq) ProtoMessage()               {}
+func (*ExpandReq) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{0} }
+
+func (m *ExpandReq) GetShorten() string {
+	if m != nil {
+		return m.Shorten
+	}
+	return ""
+}
+
+type ExpandResp struct {
+	Url string `protobuf:"bytes,1,opt,name=url" json:"url,omitempty"`
+}
+
+func (m *ExpandResp) Reset()                    { *m = ExpandResp{} }
+func (m *ExpandResp) String() string            { return proto.CompactTextString(m) }
+func (*ExpandResp) ProtoMessage()               {}
+func (*ExpandResp) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{1} }
+
+func (m *ExpandResp) GetUrl() string {
+	if m != nil {
+		return m.Url
+	}
+	return ""
+}
+
+type ShortenReq struct {
+	Url string `protobuf:"bytes,1,opt,name=url" json:"url,omitempty"`
+}
+
+func (m *ShortenReq) Reset()                    { *m = ShortenReq{} }
+func (m *ShortenReq) String() string            { return proto.CompactTextString(m) }
+func (*ShortenReq) ProtoMessage()               {}
+func (*ShortenReq) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{2} }
+
+func (m *ShortenReq) GetUrl() string {
+	if m != nil {
+		return m.Url
+	}
+	return ""
+}
+
+type ShortenResp struct {
+	Shorten string `protobuf:"bytes,1,opt,name=shorten" json:"shorten,omitempty"`
+}
+
+func (m *ShortenResp) Reset()                    { *m = ShortenResp{} }
+func (m *ShortenResp) String() string            { return proto.CompactTextString(m) }
+func (*ShortenResp) ProtoMessage()               {}
+func (*ShortenResp) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{3} }
+
+func (m *ShortenResp) GetShorten() string {
+	if m != nil {
+		return m.Shorten
+	}
+	return ""
+}
+
+func init() {
+	proto.RegisterType((*ExpandReq)(nil), "transform.expandReq")
+	proto.RegisterType((*ExpandResp)(nil), "transform.expandResp")
+	proto.RegisterType((*ShortenReq)(nil), "transform.shortenReq")
+	proto.RegisterType((*ShortenResp)(nil), "transform.shortenResp")
+}
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ context.Context
+var _ grpc.ClientConn
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+const _ = grpc.SupportPackageIsVersion4
+
+// Client API for Transformer service
+
+type TransformerClient interface {
+	Expand(ctx context.Context, in *ExpandReq, opts ...grpc.CallOption) (*ExpandResp, error)
+	Shorten(ctx context.Context, in *ShortenReq, opts ...grpc.CallOption) (*ShortenResp, error)
+}
+
+type transformerClient struct {
+	cc *grpc.ClientConn
+}
+
+func NewTransformerClient(cc *grpc.ClientConn) TransformerClient {
+	return &transformerClient{cc}
+}
+
+func (c *transformerClient) Expand(ctx context.Context, in *ExpandReq, opts ...grpc.CallOption) (*ExpandResp, error) {
+	out := new(ExpandResp)
+	err := grpc.Invoke(ctx, "/transform.transformer/expand", in, out, c.cc, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *transformerClient) Shorten(ctx context.Context, in *ShortenReq, opts ...grpc.CallOption) (*ShortenResp, error) {
+	out := new(ShortenResp)
+	err := grpc.Invoke(ctx, "/transform.transformer/shorten", in, out, c.cc, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// Server API for Transformer service
+
+type TransformerServer interface {
+	Expand(context.Context, *ExpandReq) (*ExpandResp, error)
+	Shorten(context.Context, *ShortenReq) (*ShortenResp, error)
+}
+
+func RegisterTransformerServer(s *grpc.Server, srv TransformerServer) {
+	s.RegisterService(&_Transformer_serviceDesc, srv)
+}
+
+func _Transformer_Expand_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(ExpandReq)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(TransformerServer).Expand(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/transform.transformer/Expand",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(TransformerServer).Expand(ctx, req.(*ExpandReq))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _Transformer_Shorten_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(ShortenReq)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(TransformerServer).Shorten(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/transform.transformer/Shorten",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(TransformerServer).Shorten(ctx, req.(*ShortenReq))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+var _Transformer_serviceDesc = grpc.ServiceDesc{
+	ServiceName: "transform.transformer",
+	HandlerType: (*TransformerServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "expand",
+			Handler:    _Transformer_Expand_Handler,
+		},
+		{
+			MethodName: "shorten",
+			Handler:    _Transformer_Shorten_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "transform.proto",
+}
+
+func init() { proto.RegisterFile("transform.proto", fileDescriptor0) }
+
+var fileDescriptor0 = []byte{
+	// 163 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0xe2, 0xe2, 0x2f, 0x29, 0x4a, 0xcc,
+	0x2b, 0x4e, 0xcb, 0x2f, 0xca, 0xd5, 0x2b, 0x28, 0xca, 0x2f, 0xc9, 0x17, 0xe2, 0x84, 0x0b, 0x28,
+	0xa9, 0x72, 0x71, 0xa6, 0x56, 0x14, 0x24, 0xe6, 0xa5, 0x04, 0xa5, 0x16, 0x0a, 0x49, 0x70, 0xb1,
+	0x17, 0x67, 0xe4, 0x17, 0x95, 0xa4, 0xe6, 0x49, 0x30, 0x2a, 0x30, 0x6a, 0x70, 0x06, 0xc1, 0xb8,
+	0x4a, 0x72, 0x5c, 0x5c, 0x30, 0x65, 0xc5, 0x05, 0x42, 0x02, 0x5c, 0xcc, 0xa5, 0x45, 0x39, 0x50,
+	0x35, 0x20, 0x26, 0x48, 0x1e, 0xaa, 0x14, 0x64, 0x0e, 0xa6, 0xbc, 0x3a, 0x17, 0x37, 0x5c, 0xbe,
+	0xb8, 0x00, 0xb7, 0x45, 0x46, 0x75, 0x5c, 0xdc, 0x70, 0xc7, 0xa5, 0x16, 0x09, 0x99, 0x72, 0xb1,
+	0x41, 0xec, 0x15, 0x12, 0xd1, 0x43, 0xf8, 0x02, 0xee, 0x62, 0x29, 0x51, 0x2c, 0xa2, 0xc5, 0x05,
+	0x42, 0x16, 0x70, 0xf3, 0x85, 0x90, 0x55, 0x20, 0x9c, 0x28, 0x25, 0x86, 0x4d, 0xb8, 0xb8, 0x20,
+	0x89, 0x0d, 0x1c, 0x42, 0xc6, 0x80, 0x00, 0x00, 0x00, 0xff, 0xff, 0x8a, 0x27, 0x78, 0x05, 0x34,
+	0x01, 0x00, 0x00,
+}
diff --git a/example/shorturl/rpc/transform/transform.go b/example/shorturl/rpc/transform/transform.go
new file mode 100755
index 00000000..b928739d
--- /dev/null
+++ b/example/shorturl/rpc/transform/transform.go
@@ -0,0 +1,40 @@
+// Code generated by goctl. DO NOT EDIT!
+// Source: transform.proto
+
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+
+	"shorturl/rpc/transform/internal/config"
+	"shorturl/rpc/transform/internal/server"
+	"shorturl/rpc/transform/internal/svc"
+	transform "shorturl/rpc/transform/pb"
+
+	"github.com/tal-tech/go-zero/core/conf"
+	"github.com/tal-tech/go-zero/rpcx"
+	"google.golang.org/grpc"
+)
+
+var configFile = flag.String("f", "etc/transform.yaml", "the config file")
+
+func main() {
+	flag.Parse()
+
+	var c config.Config
+	conf.MustLoad(*configFile, &c)
+	ctx := svc.NewServiceContext(c)
+	transformerSrv := server.NewTransformerServer(ctx)
+
+	s, err := rpcx.NewServer(c.RpcServerConf, func(grpcServer *grpc.Server) {
+		transform.RegisterTransformerServer(grpcServer, transformerSrv)
+	})
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	fmt.Printf("Starting rpc server at %s...\n", c.ListenOn)
+	s.Start()
+}
diff --git a/example/shorturl/rpc/transform/transform.proto b/example/shorturl/rpc/transform/transform.proto
new file mode 100644
index 00000000..58ee66f1
--- /dev/null
+++ b/example/shorturl/rpc/transform/transform.proto
@@ -0,0 +1,24 @@
+syntax = "proto3";
+
+package transform;
+
+message expandReq {
+    string shorten = 1;
+}
+
+message expandResp {
+    string url = 1;
+}
+
+message shortenReq {
+    string url = 1;
+}
+
+message shortenResp {
+    string shorten = 1;
+}
+
+service transformer {
+    rpc expand(expandReq) returns(expandResp);
+    rpc shorten(shortenReq) returns(shortenResp);
+}
diff --git a/example/shorturl/rpc/transform/transformer/transformer.go b/example/shorturl/rpc/transform/transformer/transformer.go
new file mode 100755
index 00000000..c97650dc
--- /dev/null
+++ b/example/shorturl/rpc/transform/transformer/transformer.go
@@ -0,0 +1,96 @@
+// Code generated by goctl. DO NOT EDIT!
+// Source: transform.proto
+
+//go:generate mockgen -destination ./transformer_mock.go -package transformer -source $GOFILE
+
+package transformer
+
+import (
+	"context"
+
+	transform "shorturl/rpc/transform/pb"
+
+	"github.com/tal-tech/go-zero/core/jsonx"
+	"github.com/tal-tech/go-zero/rpcx"
+)
+
+type (
+	Transformer interface {
+		Expand(ctx context.Context, in *ExpandReq) (*ExpandResp, error)
+		Shorten(ctx context.Context, in *ShortenReq) (*ShortenResp, error)
+	}
+
+	defaultTransformer struct {
+		cli rpcx.Client
+	}
+)
+
+func NewTransformer(cli rpcx.Client) Transformer {
+	return &defaultTransformer{
+		cli: cli,
+	}
+}
+
+func (m *defaultTransformer) Expand(ctx context.Context, in *ExpandReq) (*ExpandResp, error) {
+	var request transform.ExpandReq
+	bts, err := jsonx.Marshal(in)
+	if err != nil {
+		return nil, errJsonConvert
+	}
+
+	err = jsonx.Unmarshal(bts, &request)
+	if err != nil {
+		return nil, errJsonConvert
+	}
+
+	client := transform.NewTransformerClient(m.cli.Conn())
+	resp, err := client.Expand(ctx, &request)
+	if err != nil {
+		return nil, err
+	}
+
+	var ret ExpandResp
+	bts, err = jsonx.Marshal(resp)
+	if err != nil {
+		return nil, errJsonConvert
+	}
+
+	err = jsonx.Unmarshal(bts, &ret)
+	if err != nil {
+		return nil, errJsonConvert
+	}
+
+	return &ret, nil
+}
+
+func (m *defaultTransformer) Shorten(ctx context.Context, in *ShortenReq) (*ShortenResp, error) {
+	var request transform.ShortenReq
+	bts, err := jsonx.Marshal(in)
+	if err != nil {
+		return nil, errJsonConvert
+	}
+
+	err = jsonx.Unmarshal(bts, &request)
+	if err != nil {
+		return nil, errJsonConvert
+	}
+
+	client := transform.NewTransformerClient(m.cli.Conn())
+	resp, err := client.Shorten(ctx, &request)
+	if err != nil {
+		return nil, err
+	}
+
+	var ret ShortenResp
+	bts, err = jsonx.Marshal(resp)
+	if err != nil {
+		return nil, errJsonConvert
+	}
+
+	err = jsonx.Unmarshal(bts, &ret)
+	if err != nil {
+		return nil, errJsonConvert
+	}
+
+	return &ret, nil
+}
diff --git a/example/shorturl/rpc/transform/transformer/transformer_mock.go b/example/shorturl/rpc/transform/transformer/transformer_mock.go
new file mode 100644
index 00000000..48e18d06
--- /dev/null
+++ b/example/shorturl/rpc/transform/transformer/transformer_mock.go
@@ -0,0 +1,64 @@
+// Code generated by MockGen. DO NOT EDIT.
+// Source: transformer.go
+
+// Package transformer is a generated GoMock package.
+package transformer
+
+import (
+	context "context"
+	gomock "github.com/golang/mock/gomock"
+	reflect "reflect"
+)
+
+// MockTransformer is a mock of Transformer interface
+type MockTransformer struct {
+	ctrl     *gomock.Controller
+	recorder *MockTransformerMockRecorder
+}
+
+// MockTransformerMockRecorder is the mock recorder for MockTransformer
+type MockTransformerMockRecorder struct {
+	mock *MockTransformer
+}
+
+// NewMockTransformer creates a new mock instance
+func NewMockTransformer(ctrl *gomock.Controller) *MockTransformer {
+	mock := &MockTransformer{ctrl: ctrl}
+	mock.recorder = &MockTransformerMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use
+func (m *MockTransformer) EXPECT() *MockTransformerMockRecorder {
+	return m.recorder
+}
+
+// Expand mocks base method
+func (m *MockTransformer) Expand(ctx context.Context, in *ExpandReq) (*ExpandResp, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Expand", ctx, in)
+	ret0, _ := ret[0].(*ExpandResp)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// Expand indicates an expected call of Expand
+func (mr *MockTransformerMockRecorder) Expand(ctx, in interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Expand", reflect.TypeOf((*MockTransformer)(nil).Expand), ctx, in)
+}
+
+// Shorten mocks base method
+func (m *MockTransformer) Shorten(ctx context.Context, in *ShortenReq) (*ShortenResp, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Shorten", ctx, in)
+	ret0, _ := ret[0].(*ShortenResp)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// Shorten indicates an expected call of Shorten
+func (mr *MockTransformerMockRecorder) Shorten(ctx, in interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Shorten", reflect.TypeOf((*MockTransformer)(nil).Shorten), ctx, in)
+}
diff --git a/example/shorturl/rpc/transform/transformer/types.go b/example/shorturl/rpc/transform/transformer/types.go
new file mode 100755
index 00000000..e8052e17
--- /dev/null
+++ b/example/shorturl/rpc/transform/transformer/types.go
@@ -0,0 +1,26 @@
+// Code generated by goctl. DO NOT EDIT!
+// Source: transform.proto
+
+package transformer
+
+import "errors"
+
+var errJsonConvert = errors.New("json convert error")
+
+type (
+	ExpandReq struct {
+		Shorten string `json:"shorten,omitempty"`
+	}
+
+	ExpandResp struct {
+		Url string `json:"url,omitempty"`
+	}
+
+	ShortenReq struct {
+		Url string `json:"url,omitempty"`
+	}
+
+	ShortenResp struct {
+		Shorten string `json:"shorten,omitempty"`
+	}
+)