diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 502f1f92ff..69cba21154 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -6,7 +6,7 @@ jobs:
   unit-benchmark-test:
     strategy:
       matrix:
-        go: [ 1.17, 1.18, 1.19 ]
+        go: [ 1.15, 1.17, 1.18, 1.19 ]
         os: [ X64, ARM64 ]
     runs-on: ${{ matrix.os }}
     steps:
@@ -34,7 +34,7 @@ jobs:
   scenario-test:
     strategy:
       matrix:
-        go: [ 1.17, 1.18 ]
+        go: [ 1.15, 1.18 ]
     runs-on: [ self-hosted, X64 ]
     steps:
       - uses: actions/checkout@v3
diff --git a/.licenserc.yaml b/.licenserc.yaml
index 487bc8f3aa..99498ea88d 100644
--- a/.licenserc.yaml
+++ b/.licenserc.yaml
@@ -4,11 +4,14 @@ header:
     copyright-owner: CloudWeGo Authors
 
   paths:
-    - '**/*.go'
-    - '**/*.s'
+    - "**/*.go"
+    - "**/*.s"
 
   paths-ignore:
     - internal/mocks/thrift/test.go
+    - pkg/remote/codec/thrift/thrift_frugal.go
+    - pkg/remote/codec/thrift/thrift_frugal_test.go
+    - pkg/remote/codec/thrift/thrift_others.go
     - pkg/remote/trans/nphttp2/codes/codes.go
     - pkg/remote/trans/nphttp2/grpc/grpcframe/
     - pkg/remote/trans/nphttp2/grpc/bdp_estimator.go
diff --git a/go.mod b/go.mod
index b1147f9b43..859280e193 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/cloudwego/kitex
 
-go 1.16
+go 1.13
 
 require (
 	github.com/apache/thrift v0.13.0
@@ -9,7 +9,7 @@ require (
 	github.com/cloudwego/fastpb v0.0.2
 	github.com/cloudwego/frugal v0.1.3
 	github.com/cloudwego/netpoll v0.2.6
-	github.com/cloudwego/thriftgo v0.2.0
+	github.com/cloudwego/thriftgo v0.2.1
 	github.com/golang/mock v1.6.0
 	github.com/jhump/protoreflect v1.8.2
 	github.com/json-iterator/go v1.1.12
diff --git a/go.sum b/go.sum
index f827665689..b084f54895 100644
--- a/go.sum
+++ b/go.sum
@@ -23,8 +23,8 @@ github.com/cloudwego/netpoll v0.2.4/go.mod h1:1T2WVuQ+MQw6h6DpE45MohSvDTKdy2DlzC
 github.com/cloudwego/netpoll v0.2.6 h1:vzN8cyayoa9RdCOG87tqkYO/j2hA4SMLC+vkcNUq6uI=
 github.com/cloudwego/netpoll v0.2.6/go.mod h1:1T2WVuQ+MQw6h6DpE45MohSvDTKdy2DlzCx2KsnPI4E=
 github.com/cloudwego/thriftgo v0.1.2/go.mod h1:LzeafuLSiHA9JTiWC8TIMIq64iadeObgRUhmVG1OC/w=
-github.com/cloudwego/thriftgo v0.2.0 h1:gDNxU1CmNkwwe/I9UfuCTIc1DXu5FVFa2cMWwT61e50=
-github.com/cloudwego/thriftgo v0.2.0/go.mod h1:aZxiVX7KJdonZwwnapZEMDAAGUGk9WCIkNU3YoVjbpg=
+github.com/cloudwego/thriftgo v0.2.1 h1:pKEZDDND14+kG4ILPCq0sqv3gidjxOnf/wLjOwxzBks=
+github.com/cloudwego/thriftgo v0.2.1/go.mod h1:8i9AF5uDdWHGqzUhXDlubCjx4MEfKvWXGQlMWyR0tM4=
 github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
diff --git a/pkg/generic/httppbthrift_codec.go b/pkg/generic/httppbthrift_codec.go
index f598c3e1de..919b548b4f 100644
--- a/pkg/generic/httppbthrift_codec.go
+++ b/pkg/generic/httppbthrift_codec.go
@@ -21,6 +21,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"io/ioutil"
 	"net/http"
 	"strings"
 	"sync/atomic"
@@ -168,7 +169,7 @@ func FromHTTPPbRequest(req *http.Request) (*HTTPRequest, error) {
 		// body == nil if from Get request
 		return customReq, nil
 	}
-	if customReq.RawBody, err = io.ReadAll(b); err != nil {
+	if customReq.RawBody, err = ioutil.ReadAll(b); err != nil {
 		return nil, err
 	}
 	if len(customReq.RawBody) == 0 {
diff --git a/pkg/generic/httpthrift_codec.go b/pkg/generic/httpthrift_codec.go
index c704e8f69f..593c341bba 100644
--- a/pkg/generic/httpthrift_codec.go
+++ b/pkg/generic/httpthrift_codec.go
@@ -21,6 +21,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"io/ioutil"
 	"net/http"
 	"sync/atomic"
 
@@ -154,7 +155,7 @@ func FromHTTPRequest(req *http.Request) (*HTTPRequest, error) {
 		// body == nil if from Get request
 		return customReq, nil
 	}
-	if customReq.RawBody, err = io.ReadAll(b); err != nil {
+	if customReq.RawBody, err = ioutil.ReadAll(b); err != nil {
 		return nil, err
 	}
 	if len(customReq.RawBody) == 0 {
diff --git a/pkg/remote/codec/thrift/thrift.go b/pkg/remote/codec/thrift/thrift.go
index 3ee6aa08fe..38c8275b08 100644
--- a/pkg/remote/codec/thrift/thrift.go
+++ b/pkg/remote/codec/thrift/thrift.go
@@ -172,7 +172,7 @@ func (c thriftCodec) Unmarshal(ctx context.Context, message remote.Message, in r
 	data := message.Data()
 
 	// decode with hyper unmarshal
-	if c.hyperMarshalEnabled() && hyperMessageUnmarshalAvailable(data, message) {
+	if c.hyperMessageUnmarshalEnabled() && hyperMessageUnmarshalAvailable(data, message) {
 		msgBeginLen := bthrift.Binary.MessageBeginLength(methodName, msgType, seqID)
 		ri := message.RPCInfo()
 		internal_stats.Record(ctx, ri, stats.WaitReadStart, nil)
diff --git a/pkg/remote/codec/thrift/thrift_frugal.go b/pkg/remote/codec/thrift/thrift_frugal.go
index e3964776e4..c9c114baee 100644
--- a/pkg/remote/codec/thrift/thrift_frugal.go
+++ b/pkg/remote/codec/thrift/thrift_frugal.go
@@ -1,5 +1,5 @@
-//go:build amd64 && !windows
-// +build amd64,!windows
+//go:build amd64 && !windows && !go1.13 && !go.14
+// +build amd64,!windows,!go1.13,!go.14
 
 /*
  * Copyright 2021 CloudWeGo Authors
diff --git a/pkg/remote/codec/thrift/thrift_frugal_test.go b/pkg/remote/codec/thrift/thrift_frugal_test.go
index 92c73e14cf..a5794bf0fa 100644
--- a/pkg/remote/codec/thrift/thrift_frugal_test.go
+++ b/pkg/remote/codec/thrift/thrift_frugal_test.go
@@ -1,5 +1,5 @@
-//go:build amd64 && !windows
-// +build amd64,!windows
+//go:build amd64 && !windows && !go1.13 && !go.14
+// +build amd64,!windows,!go1.13,!go.14
 
 // Copyright 2022 ByteDance Inc.
 //
diff --git a/pkg/remote/codec/thrift/thrift_others.go b/pkg/remote/codec/thrift/thrift_others.go
index 487995b83d..8309aad6b6 100644
--- a/pkg/remote/codec/thrift/thrift_others.go
+++ b/pkg/remote/codec/thrift/thrift_others.go
@@ -1,5 +1,5 @@
-//go:build !amd64 || windows
-// +build !amd64 windows
+//go:build !amd64 || windows || go1.13 || go1.14
+// +build !amd64 windows go1.13 go1.14
 
 /*
  * Copyright 2021 CloudWeGo Authors
diff --git a/pkg/remote/trans/gonet/conn_extension.go b/pkg/remote/trans/gonet/conn_extension.go
index b239b3dbab..db8ffd338e 100644
--- a/pkg/remote/trans/gonet/conn_extension.go
+++ b/pkg/remote/trans/gonet/conn_extension.go
@@ -21,6 +21,7 @@ import (
 	"errors"
 	"io"
 	"net"
+	"strings"
 	"syscall"
 
 	"github.com/cloudwego/netpoll"
@@ -75,8 +76,10 @@ func (e *gonetConnExtension) IsRemoteClosedErr(err error) bool {
 	if err == nil {
 		return false
 	}
-	return errors.Is(err, net.ErrClosed) ||
-		errors.Is(err, netpoll.ErrConnClosed) ||
+	// strings.Contains(err.Error(), "closed network connection") change to errors.Is(err, net.ErrClosed)
+	// when support go version >= 1.16
+	return errors.Is(err, netpoll.ErrConnClosed) ||
 		errors.Is(err, io.EOF) ||
-		errors.Is(err, syscall.EPIPE)
+		errors.Is(err, syscall.EPIPE) ||
+		strings.Contains(err.Error(), "closed network connection")
 }
diff --git a/pkg/remote/trans/netpoll/http_client_handler.go b/pkg/remote/trans/netpoll/http_client_handler.go
index 6fc6712df8..593b81c334 100644
--- a/pkg/remote/trans/netpoll/http_client_handler.go
+++ b/pkg/remote/trans/netpoll/http_client_handler.go
@@ -21,7 +21,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"io"
+	"io/ioutil"
 	"net"
 	"net/http"
 	"path"
@@ -279,7 +279,7 @@ func getBodyBufReader(buf remote.ByteBuffer) (remote.ByteBuffer, error) {
 	if hr.StatusCode != http.StatusOK {
 		return nil, fmt.Errorf("http response not OK, StatusCode: %d", hr.StatusCode)
 	}
-	b, err := io.ReadAll(hr.Body)
+	b, err := ioutil.ReadAll(hr.Body)
 	hr.Body.Close()
 	if err != nil {
 		return nil, fmt.Errorf("read http response body error:%w", err)
diff --git a/pkg/utils/yaml.go b/pkg/utils/yaml.go
index 16f8b80deb..61946128b1 100644
--- a/pkg/utils/yaml.go
+++ b/pkg/utils/yaml.go
@@ -17,7 +17,7 @@
 package utils
 
 import (
-	"io"
+	"io/ioutil"
 	"os"
 	"time"
 
@@ -45,7 +45,7 @@ func ReadYamlConfigFile(yamlFile string) (*YamlConfig, error) {
 	}
 	defer fd.Close()
 
-	b, err := io.ReadAll(fd)
+	b, err := ioutil.ReadAll(fd)
 	if err != nil {
 		return nil, err
 	}
diff --git a/tool/internal_pkg/pluginmode/protoc/protoc.go b/tool/internal_pkg/pluginmode/protoc/protoc.go
index da031940e0..f729cf0553 100644
--- a/tool/internal_pkg/pluginmode/protoc/protoc.go
+++ b/tool/internal_pkg/pluginmode/protoc/protoc.go
@@ -17,7 +17,7 @@ package protoc
 import (
 	"errors"
 	"fmt"
-	"io"
+	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strings"
@@ -44,7 +44,7 @@ func Run() int {
 
 func run(opts protogen.Options) error {
 	// unmarshal request from stdin
-	in, err := io.ReadAll(os.Stdin)
+	in, err := ioutil.ReadAll(os.Stdin)
 	if err != nil {
 		return err
 	}
diff --git a/tool/internal_pkg/pluginmode/thriftgo/convertor.go b/tool/internal_pkg/pluginmode/thriftgo/convertor.go
index 66543233ef..5e42fa7448 100644
--- a/tool/internal_pkg/pluginmode/thriftgo/convertor.go
+++ b/tool/internal_pkg/pluginmode/thriftgo/convertor.go
@@ -18,6 +18,7 @@ import (
 	"fmt"
 	"go/format"
 	"io"
+	"io/ioutil"
 	"os"
 	"path/filepath"
 	"regexp"
@@ -467,7 +468,7 @@ func (c *converter) persist(res *plugin.Response) error {
 		if err := os.MkdirAll(path, 0o755); err != nil && !os.IsExist(err) {
 			return fmt.Errorf("failed to create path '%s': %w", path, err)
 		}
-		if err := os.WriteFile(full, content, 0o644); err != nil {
+		if err := ioutil.WriteFile(full, content, 0o644); err != nil {
 			return fmt.Errorf("failed to write file '%s': %w", full, err)
 		}
 	}
diff --git a/tool/internal_pkg/pluginmode/thriftgo/patcher.go b/tool/internal_pkg/pluginmode/thriftgo/patcher.go
index e49ad95f7a..b7102a4151 100644
--- a/tool/internal_pkg/pluginmode/thriftgo/patcher.go
+++ b/tool/internal_pkg/pluginmode/thriftgo/patcher.go
@@ -16,7 +16,7 @@ package thriftgo
 
 import (
 	"fmt"
-	"os"
+	"io/ioutil"
 	"path/filepath"
 	"reflect"
 	"sort"
@@ -205,7 +205,7 @@ func (p *patcher) patch(req *plugin.Request) (patches []*plugin.Generated, err e
 		})
 
 		if p.copyIDL {
-			content, err := os.ReadFile(ast.Filename)
+			content, err := ioutil.ReadFile(ast.Filename)
 			if err != nil {
 				return nil, fmt.Errorf("read %q: %w", ast.Filename, err)
 			}
diff --git a/tool/internal_pkg/pluginmode/thriftgo/plugin.go b/tool/internal_pkg/pluginmode/thriftgo/plugin.go
index 965579ddae..653a157a3f 100644
--- a/tool/internal_pkg/pluginmode/thriftgo/plugin.go
+++ b/tool/internal_pkg/pluginmode/thriftgo/plugin.go
@@ -17,7 +17,7 @@ package thriftgo
 import (
 	"errors"
 	"fmt"
-	"io"
+	"io/ioutil"
 	"os"
 
 	"github.com/cloudwego/thriftgo/plugin"
@@ -34,7 +34,7 @@ const TheUseOptionMessage = "kitex_gen is not generated due to the -use option"
 // Run is an entry of the plugin mode of kitex for thriftgo.
 // It reads a plugin request from the standard input and writes out a response.
 func Run() int {
-	data, err := io.ReadAll(os.Stdin)
+	data, err := ioutil.ReadAll(os.Stdin)
 	if err != nil {
 		println("Failed to get input:", err.Error())
 		return 1
diff --git a/tool/internal_pkg/tpl/bootstrap.sh.go b/tool/internal_pkg/tpl/bootstrap.sh.go
new file mode 100644
index 0000000000..1a8f2d2667
--- /dev/null
+++ b/tool/internal_pkg/tpl/bootstrap.sh.go
@@ -0,0 +1,39 @@
+// Copyright 2022 CloudWeGo 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 tpl
+
+// BootstrapTpl is the template for generating bootstrap.sh.
+var BootstrapTpl string = `#! /usr/bin/env bash
+CURDIR=$(cd $(dirname $0); pwd)
+
+if [ "X$1" != "X" ]; then
+    RUNTIME_ROOT=$1
+else
+    RUNTIME_ROOT=${CURDIR}
+fi
+
+export KITEX_RUNTIME_ROOT=$RUNTIME_ROOT
+export KITEX_LOG_DIR="$RUNTIME_ROOT/log"
+
+if [ ! -d "$KITEX_LOG_DIR/app" ]; then
+    mkdir -p "$KITEX_LOG_DIR/app"
+fi
+
+if [ ! -d "$KITEX_LOG_DIR/rpc" ]; then
+    mkdir -p "$KITEX_LOG_DIR/rpc"
+fi
+
+exec "$CURDIR/bin/{{.RealServiceName}}"
+`
diff --git a/tool/internal_pkg/tpl/bootstrap.sh.tmpl b/tool/internal_pkg/tpl/bootstrap.sh.tmpl
deleted file mode 100644
index a915fa84b0..0000000000
--- a/tool/internal_pkg/tpl/bootstrap.sh.tmpl
+++ /dev/null
@@ -1,21 +0,0 @@
-#! /usr/bin/env bash
-CURDIR=$(cd $(dirname $0); pwd)
-
-if [ "X$1" != "X" ]; then
-    RUNTIME_ROOT=$1
-else
-    RUNTIME_ROOT=${CURDIR}
-fi
-
-export KITEX_RUNTIME_ROOT=$RUNTIME_ROOT
-export KITEX_LOG_DIR="$RUNTIME_ROOT/log"
-
-if [ ! -d "$KITEX_LOG_DIR/app" ]; then
-    mkdir -p "$KITEX_LOG_DIR/app"
-fi
-
-if [ ! -d "$KITEX_LOG_DIR/rpc" ]; then
-    mkdir -p "$KITEX_LOG_DIR/rpc"
-fi
-
-exec "$CURDIR/bin/{{.RealServiceName}}"
diff --git a/tool/internal_pkg/tpl/build.sh.go b/tool/internal_pkg/tpl/build.sh.go
new file mode 100644
index 0000000000..83804e8084
--- /dev/null
+++ b/tool/internal_pkg/tpl/build.sh.go
@@ -0,0 +1,30 @@
+// Copyright 2022 CloudWeGo Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package tpl
+
+// BuildTpl is the template for generating build.sh.
+var BuildTpl string = `#!/usr/bin/env bash
+RUN_NAME="{{.RealServiceName}}"
+
+mkdir -p output/bin
+cp script/* output/
+chmod +x output/bootstrap.sh
+
+if [ "$IS_SYSTEM_TEST_ENV" != "1" ]; then
+    go build -o output/bin/${RUN_NAME}
+else
+    go test -c -covermode=set -o output/bin/${RUN_NAME} -coverpkg=./...
+fi
+`
diff --git a/tool/internal_pkg/tpl/build.sh.tmpl b/tool/internal_pkg/tpl/build.sh.tmpl
deleted file mode 100644
index 26ab9f2a1a..0000000000
--- a/tool/internal_pkg/tpl/build.sh.tmpl
+++ /dev/null
@@ -1,12 +0,0 @@
-#!/usr/bin/env bash
-RUN_NAME="{{.RealServiceName}}"
-
-mkdir -p output/bin
-cp script/* output/
-chmod +x output/bootstrap.sh
-
-if [ "$IS_SYSTEM_TEST_ENV" != "1" ]; then
-    go build -o output/bin/${RUN_NAME}
-else
-    go test -c -covermode=set -o output/bin/${RUN_NAME} -coverpkg=./...
-fi
diff --git a/tool/internal_pkg/tpl/client.go.tmpl b/tool/internal_pkg/tpl/client.go
similarity index 79%
rename from tool/internal_pkg/tpl/client.go.tmpl
rename to tool/internal_pkg/tpl/client.go
index 7661e317c2..9d86784761 100644
--- a/tool/internal_pkg/tpl/client.go.tmpl
+++ b/tool/internal_pkg/tpl/client.go
@@ -1,4 +1,21 @@
-// Code generated by Kitex {{.Version}}. DO NOT EDIT.
+// Copyright 2022 CloudWeGo 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 tpl
+
+// ClientTpl is the template for generating client.go.
+var ClientTpl string = `// Code generated by Kitex {{.Version}}. DO NOT EDIT.
 
 package {{ToLower .ServiceName}}
 import (
@@ -77,3 +94,4 @@ func (p *k{{$.ServiceName}}Client) {{.Name}}(ctx context.Context {{range .Args}}
 {{- end}}
 {{end}}
 {{template "@client.go-EOF" .}}
+`
diff --git a/tool/internal_pkg/tpl/handler.go b/tool/internal_pkg/tpl/handler.go
new file mode 100644
index 0000000000..7227e301f3
--- /dev/null
+++ b/tool/internal_pkg/tpl/handler.go
@@ -0,0 +1,29 @@
+// Copyright 2022 CloudWeGo 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 tpl
+
+// HandlerTpl is the template for generating handler.go.
+var HandlerTpl string = `package main
+
+import (
+	{{- range $path, $alias := .Imports}}
+	{{$alias }}"{{$path}}"
+	{{- end}}
+)
+
+// {{.ServiceName}}Impl implements the last service interface defined in the IDL.
+type {{.ServiceName}}Impl struct{}
+{{template "HandlerMethod" .}}
+`
diff --git a/tool/internal_pkg/tpl/handler.go.tmpl b/tool/internal_pkg/tpl/handler.go.tmpl
deleted file mode 100644
index 03c439f151..0000000000
--- a/tool/internal_pkg/tpl/handler.go.tmpl
+++ /dev/null
@@ -1,11 +0,0 @@
-package main
-
-import (
-	{{- range $path, $alias := .Imports}}
-	{{$alias }}"{{$path}}"
-	{{- end}}
-)
-
-// {{.ServiceName}}Impl implements the last service interface defined in the IDL.
-type {{.ServiceName}}Impl struct{}
-{{template "HandlerMethod" .}}
diff --git a/tool/internal_pkg/tpl/handler.method.tmpl b/tool/internal_pkg/tpl/handler.method.go
similarity index 54%
rename from tool/internal_pkg/tpl/handler.method.tmpl
rename to tool/internal_pkg/tpl/handler.method.go
index cddb51f0f2..8cf009de9a 100644
--- a/tool/internal_pkg/tpl/handler.method.tmpl
+++ b/tool/internal_pkg/tpl/handler.method.go
@@ -1,4 +1,21 @@
-{{define "HandlerMethod"}}
+// Copyright 2022 CloudWeGo Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package tpl
+
+// HandlerMethodTpl is the template for generating methods in handler.go.
+var HandlerMethodsTpl string = `{{define "HandlerMethod"}}
 {{range .AllMethods}}
 {{- if or .ClientStreaming .ServerStreaming}}
 func (s *{{$.ServiceName}}Impl) {{.Name}}({{if not .ClientStreaming}}{{range .Args}}{{LowerFirst .Name}} {{.Type}}, {{end}}{{end}}stream {{.PkgRefName}}.{{.ServiceName}}_{{.RawName}}Server) (err error) {	
@@ -22,3 +39,4 @@ func (s *{{$.ServiceName}}Impl) {{.Name}}(ctx context.Context {{range .Args}}, {
 {{end}}
 {{end}}
 {{end}}{{/* define "HandlerMethod" */}}
+`
diff --git a/tool/internal_pkg/tpl/invoker.go b/tool/internal_pkg/tpl/invoker.go
new file mode 100644
index 0000000000..6cd9b2ccba
--- /dev/null
+++ b/tool/internal_pkg/tpl/invoker.go
@@ -0,0 +1,44 @@
+// Copyright 2022 CloudWeGo 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 tpl
+
+// InvokerTpl is the template for generating invoker.go.
+var InvokerTpl string = `// Code generated by Kitex {{.Version}}. DO NOT EDIT.
+
+package {{ToLower .ServiceName}}
+
+import (
+	{{- range $path, $alias := .Imports}}
+	{{$alias }}"{{$path}}"
+	{{- end}}
+)
+
+// NewInvoker creates a server.Invoker with the given handler and options.
+func NewInvoker(handler {{call .ServiceTypeName}}, opts ...server.Option) server.Invoker {
+	var options []server.Option
+    {{template "@invoker.go-NewInvoker-option" .}}
+	options = append(options, opts...)
+
+    s := server.NewInvoker(options...)
+    if err := s.RegisterService(serviceInfo(), handler); err != nil {
+            panic(err)
+	}
+	if err := s.Init(); err != nil {
+		panic(err)
+	}
+    return s
+}
+{{template "@invoker.go-EOF" .}}
+`
diff --git a/tool/internal_pkg/tpl/invoker.go.tmpl b/tool/internal_pkg/tpl/invoker.go.tmpl
deleted file mode 100644
index 37f262c86d..0000000000
--- a/tool/internal_pkg/tpl/invoker.go.tmpl
+++ /dev/null
@@ -1,26 +0,0 @@
-// Code generated by Kitex {{.Version}}. DO NOT EDIT.
-
-package {{ToLower .ServiceName}}
-
-import (
-	{{- range $path, $alias := .Imports}}
-	{{$alias }}"{{$path}}"
-	{{- end}}
-)
-
-// NewInvoker creates a server.Invoker with the given handler and options.
-func NewInvoker(handler {{call .ServiceTypeName}}, opts ...server.Option) server.Invoker {
-	var options []server.Option
-    {{template "@invoker.go-NewInvoker-option" .}}
-	options = append(options, opts...)
-
-    s := server.NewInvoker(options...)
-    if err := s.RegisterService(serviceInfo(), handler); err != nil {
-            panic(err)
-	}
-	if err := s.Init(); err != nil {
-		panic(err)
-	}
-    return s
-}
-{{template "@invoker.go-EOF" .}}
diff --git a/tool/internal_pkg/tpl/main.go b/tool/internal_pkg/tpl/main.go
new file mode 100644
index 0000000000..347eef630d
--- /dev/null
+++ b/tool/internal_pkg/tpl/main.go
@@ -0,0 +1,35 @@
+// Copyright 2022 CloudWeGo 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 tpl
+
+// MainTpl is the template for generating main.go
+var MainTpl string = `package main
+
+import (
+	{{- range $path, $alias := .Imports}}
+	{{$alias }}"{{$path}}"
+	{{- end}}
+)
+
+func main() {
+    svr := {{.PkgRefName}}.NewServer(new({{.ServiceName}}Impl))
+
+    err := svr.Run()
+
+    if err != nil {
+        log.Println(err.Error())
+    }
+}
+`
diff --git a/tool/internal_pkg/tpl/main.go.tmpl b/tool/internal_pkg/tpl/main.go.tmpl
deleted file mode 100644
index c8203daec9..0000000000
--- a/tool/internal_pkg/tpl/main.go.tmpl
+++ /dev/null
@@ -1,17 +0,0 @@
-package main
-
-import (
-	{{- range $path, $alias := .Imports}}
-	{{$alias }}"{{$path}}"
-	{{- end}}
-)
-
-func main() {
-    svr := {{.PkgRefName}}.NewServer(new({{.ServiceName}}Impl))
-
-    err := svr.Run()
-
-    if err != nil {
-        log.Println(err.Error())
-    }
-}
diff --git a/tool/internal_pkg/tpl/server.go b/tool/internal_pkg/tpl/server.go
new file mode 100644
index 0000000000..6f1a5474ef
--- /dev/null
+++ b/tool/internal_pkg/tpl/server.go
@@ -0,0 +1,40 @@
+// Copyright 2022 CloudWeGo 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 tpl
+
+// ServerTpl is the template for generating server.go.
+var ServerTpl string = `// Code generated by Kitex {{.Version}}. DO NOT EDIT.
+package {{ToLower .ServiceName}}
+
+import (
+    {{- range $path, $alias := .Imports}}
+    {{$alias }}"{{$path}}"
+    {{- end}}
+)
+
+// NewServer creates a server.Server with the given handler and options.
+func NewServer(handler {{call .ServiceTypeName}}, opts ...server.Option) server.Server {
+    var options []server.Option
+    {{template "@server.go-NewServer-option" .}}
+    options = append(options, opts...)
+
+    svr := server.NewServer(options...)
+    if err := svr.RegisterService(serviceInfo(), handler); err != nil {
+            panic(err)
+    }
+    return svr
+}
+{{template "@server.go-EOF" .}}
+`
diff --git a/tool/internal_pkg/tpl/server.go.tmpl b/tool/internal_pkg/tpl/server.go.tmpl
deleted file mode 100644
index 398d355e40..0000000000
--- a/tool/internal_pkg/tpl/server.go.tmpl
+++ /dev/null
@@ -1,22 +0,0 @@
-// Code generated by Kitex {{.Version}}. DO NOT EDIT.
-package {{ToLower .ServiceName}}
-
-import (
-    {{- range $path, $alias := .Imports}}
-    {{$alias }}"{{$path}}"
-    {{- end}}
-)
-
-// NewServer creates a server.Server with the given handler and options.
-func NewServer(handler {{call .ServiceTypeName}}, opts ...server.Option) server.Server {
-    var options []server.Option
-    {{template "@server.go-NewServer-option" .}}
-    options = append(options, opts...)
-
-    svr := server.NewServer(options...)
-    if err := svr.RegisterService(serviceInfo(), handler); err != nil {
-            panic(err)
-    }
-    return svr
-}
-{{template "@server.go-EOF" .}}
diff --git a/tool/internal_pkg/tpl/service.go.tmpl b/tool/internal_pkg/tpl/service.go
similarity index 93%
rename from tool/internal_pkg/tpl/service.go.tmpl
rename to tool/internal_pkg/tpl/service.go
index 5db87095d9..652c50a891 100644
--- a/tool/internal_pkg/tpl/service.go.tmpl
+++ b/tool/internal_pkg/tpl/service.go
@@ -1,4 +1,21 @@
-// Code generated by Kitex {{.Version}}. DO NOT EDIT.
+// Copyright 2022 CloudWeGo 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 tpl
+
+// ServiceTpl is the template for generating the servicename.go source.
+var ServiceTpl string = `// Code generated by Kitex {{.Version}}. DO NOT EDIT.
 
 package {{ToLower .ServiceName}}
 
@@ -386,3 +403,4 @@ func (p *kClient) {{.Name}}(ctx context.Context {{range .Args}}, {{.RawName}} {{
 }
 {{- end}}
 {{end}}
+`
diff --git a/tool/internal_pkg/tpl/templates.go b/tool/internal_pkg/tpl/templates.go
deleted file mode 100644
index fbe7a2c565..0000000000
--- a/tool/internal_pkg/tpl/templates.go
+++ /dev/null
@@ -1,62 +0,0 @@
-// Copyright 2022 CloudWeGo 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 tpl
-
-import _ "embed"
-
-// BootstrapTpl is the template for generating bootstrap.sh.
-//
-//go:embed bootstrap.sh.tmpl
-var BootstrapTpl string
-
-// BuildTpl is the template for generating build.sh.
-//
-//go:embed build.sh.tmpl
-var BuildTpl string
-
-// ClientTpl is the template for generating client.go.
-//
-//go:embed client.go.tmpl
-var ClientTpl string
-
-// HandlerTpl is the template for generating handler.go.
-//
-//go:embed handler.go.tmpl
-var HandlerTpl string
-
-// HandlerMethodTpl is the template for generating methods in handler.go.
-//
-//go:embed handler.method.tmpl
-var HandlerMethodsTpl string
-
-// InvokerTpl is the template for generating invoker.go.
-//
-//go:embed invoker.go.tmpl
-var InvokerTpl string
-
-// MainTpl is the template for generating main.go.
-//
-//go:embed main.go.tmpl
-var MainTpl string
-
-// ServerTpl is the template for generating server.go.
-//
-//go:embed server.go.tmpl
-var ServerTpl string
-
-// ServiceTpl is the template for generating the servicename.go source.
-//
-//go:embed service.go.tmpl
-var ServiceTpl string
diff --git a/tool/internal_pkg/util/util.go b/tool/internal_pkg/util/util.go
index e034cb1e74..c4da49667c 100644
--- a/tool/internal_pkg/util/util.go
+++ b/tool/internal_pkg/util/util.go
@@ -18,6 +18,7 @@ import (
 	"fmt"
 	"go/build"
 	"go/format"
+	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -110,7 +111,7 @@ func NotPtr(s string) string {
 func SearchGoMod(cwd string) (moduleName, path string, found bool) {
 	for {
 		path = filepath.Join(cwd, "go.mod")
-		data, err := os.ReadFile(path)
+		data, err := ioutil.ReadFile(path)
 		if err == nil {
 			re := regexp.MustCompile(`^\s*module\s+(\S+)\s*`)
 			for _, line := range strings.Split(string(data), "\n") {
diff --git a/version.go b/version.go
index 5dd5e99900..82252ac06b 100644
--- a/version.go
+++ b/version.go
@@ -19,5 +19,5 @@ package kitex
 // Name and Version info of this framework, used for statistics and debug
 const (
 	Name    = "Kitex"
-	Version = "v0.4.1"
+	Version = "v0.4.2"
 )