diff --git a/README.md b/README.md
index 9948469..5bf5084 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 <br/>
 
 ![Go version](https://img.shields.io/badge/go-%3E%3D1.16<recommend>-9cf)
-[![Release](https://img.shields.io/badge/release-1.2.4-green.svg)](https://github.com/duke-git/lancet/releases)
+[![Release](https://img.shields.io/badge/release-1.2.5-green.svg)](https://github.com/duke-git/lancet/releases)
 [![GoDoc](https://godoc.org/github.com//duke-git/lancet?status.svg)](https://pkg.go.dev/github.com/duke-git/lancet)
 [![Go Report Card](https://goreportcard.com/badge/github.com/duke-git/lancet)](https://goreportcard.com/report/github.com/duke-git/lancet)
 [![test](https://github.com/duke-git/lancet/actions/workflows/codecov.yml/badge.svg?branch=main&event=push)](https://github.com/duke-git/lancet/actions/workflows/codecov.yml)
@@ -192,7 +192,6 @@ import "github.com/duke-git/lancet/function"
 - [Compose](https://github.com/duke-git/lancet/blob/main/docs/function.md#Compose)
 - [Debounced](https://github.com/duke-git/lancet/blob/main/docs/function.md#Debounced)
 - [Delay](https://github.com/duke-git/lancet/blob/main/docs/function.md#Delay)
-- [Delay](https://github.com/duke-git/lancet/blob/main/docs/function.md#Delay)
 - [Watcher](https://github.com/duke-git/lancet/blob/main/docs/function.md#Watcher)
 
 ### Netutil package contains functions to get net information and send http request.
@@ -225,6 +224,7 @@ import "github.com/duke-git/lancet/random"
 - [RandBytes](https://github.com/duke-git/lancet/blob/main/docs/random.md#RandBytes)
 - [RandInt](https://github.com/duke-git/lancet/blob/main/docs/random.md#RandInt)
 - [RandString](https://github.com/duke-git/lancet/blob/main/docs/random.md#RandString)
+- [UUIdV4](https://github.com/duke-git/lancet/blob/main/docs/random.md#UUIdV4)
 
 ### Retry package is for executing a function repeatedly until it was successful or canceled by the context.
 
diff --git a/README_zh-CN.md b/README_zh-CN.md
index b0b32da..d3748cc 100644
--- a/README_zh-CN.md
+++ b/README_zh-CN.md
@@ -4,7 +4,7 @@
 <br/>
 
 ![Go version](https://img.shields.io/badge/go-%3E%3D1.16<recommend>-9cf)
-[![Release](https://img.shields.io/badge/release-1.2.4-green.svg)](https://github.com/duke-git/lancet/releases)
+[![Release](https://img.shields.io/badge/release-1.2.5-green.svg)](https://github.com/duke-git/lancet/releases)
 [![GoDoc](https://godoc.org/github.com//duke-git/lancet?status.svg)](https://pkg.go.dev/github.com/duke-git/lancet)
 [![Go Report Card](https://goreportcard.com/badge/github.com/duke-git/lancet)](https://goreportcard.com/report/github.com/duke-git/lancet)
 [![test](https://github.com/duke-git/lancet/actions/workflows/codecov.yml/badge.svg?branch=main&event=push)](https://github.com/duke-git/lancet/actions/workflows/codecov.yml)
@@ -193,7 +193,6 @@ import "github.com/duke-git/lancet/function"
 - [Compose](https://github.com/duke-git/lancet/blob/main/docs/function_zh-CN.md#Compose)
 - [Debounced](https://github.com/duke-git/lancet/blob/main/docs/function_zh-CN.md#Debounced)
 - [Delay](https://github.com/duke-git/lancet/blob/main/docs/function_zh-CN.md#Delay)
-- [Delay](https://github.com/duke-git/lancet/blob/main/docs/function_zh-CN.md#Delay)
 - [Watcher](https://github.com/duke-git/lancet/blob/main/docs/function_zh-CN.md#Watcher)
 
 
@@ -227,7 +226,7 @@ import "github.com/duke-git/lancet/random"
 - [RandBytes](https://github.com/duke-git/lancet/blob/main/docs/random_zh-CN.md#RandBytes)
 - [RandInt](https://github.com/duke-git/lancet/blob/main/docs/random_zh-CN.md#RandInt)
 - [RandString](https://github.com/duke-git/lancet/blob/main/docs/random_zh-CN.md#RandString)
-
+- [UUIdV4](https://github.com/duke-git/lancet/blob/main/docs/random.md#UUIdV4)
 ### retry重试执行函数直到函数运行成功或被context cancel。
 
 ```go
diff --git a/function/function.go b/function/function.go
index bdabb62..6e2cddb 100644
--- a/function/function.go
+++ b/function/function.go
@@ -13,7 +13,7 @@ import (
 func After(n int, fn interface{}) func(args ...interface{}) []reflect.Value {
 	// Catch programming error while constructing the closure
 	mustBeFunction(fn)
-	
+
 	return func(args ...interface{}) []reflect.Value {
 		n--
 		if n < 1 {
diff --git a/netutil/net_internal.go b/netutil/net_internal.go
index de98f49..f796091 100644
--- a/netutil/net_internal.go
+++ b/netutil/net_internal.go
@@ -157,16 +157,13 @@ func setQueryParam(req *http.Request, reqUrl string, queryParam interface{}) err
 
 func setBodyByte(req *http.Request, body interface{}) error {
 	if body != nil {
-		var bodyByte []byte
-		if body != nil {
-			switch v := body.(type) {
-			case []byte:
-				bodyByte = v
-			default:
-				return errors.New("body type should be []byte")
-			}
+		switch b := body.(type) {
+		case []byte:
+			req.Body = ioutil.NopCloser(bytes.NewReader(b))
+			req.ContentLength = int64(len(b))
+		default:
+			return errors.New("body type should be []byte")
 		}
-		req.Body = ioutil.NopCloser(bytes.NewReader(bodyByte))
 	}
 	return nil
 }