diff --git a/README.md b/README.md
index d0997fd..93d3f8b 100644
--- a/README.md
+++ b/README.md
@@ -179,10 +179,10 @@ Function:
 Example:  
 
 Client Request Example:
-./http_bench -c 1 -n 1 "https://127.0.0.1:18090?data={{ randomDate \"YMD\"}}" -verbose 0
+./http_bench -c 1 -n 1 "https://127.0.0.1:18090?data={{ randomDate 'YMD' }}" -verbose 0
 
 Body Request Example:
-./http_bench -c 1 -n 1 "https://127.0.0.1:18090" -body "data={{ randomDate \"YMD\" }}" -verbose 0
+./http_bench -c 1 -n 1 "https://127.0.0.1:18090" -body "data={{ randomDate 'YMD' }}" -verbose 0
 ```
 
 **(4) randomString**  
@@ -221,10 +221,10 @@ Function:
 Example:  
 
 Client Request Example:
-./http_bench -c 1 -n 1 "https://127.0.0.1:18090?data={{ date \"YMD\" }}" -verbose 0
+./http_bench -c 1 -n 1 "https://127.0.0.1:18090?data={{ date 'YMD' }}" -verbose 0
 
 Body Request Example:
-./http_bench -c 1 -n 1 "https://127.0.0.1:18090" -body "data={{ date \"YMD\" }}" -verbose 0
+./http_bench -c 1 -n 1 "https://127.0.0.1:18090" -body "data={{ date 'YMD' }}" -verbose 0
 ```
 
 **(7) UUID**  
diff --git a/README_CN.md b/README_CN.md
index 2b4f403..dbbf264 100644
--- a/README_CN.md
+++ b/README_CN.md
@@ -170,10 +170,10 @@ Function:
 Example:  
 
 Client Request Example:
-./http_bench -c 1 -n 1 "https://127.0.0.1:18090?data={{ randomDate \"YMD\"}}" -verbose 0
+./http_bench -c 1 -n 1 "https://127.0.0.1:18090?data={{ randomDate 'YMD' }}" -verbose 0
 
 Body Request Example:
-./http_bench -c 1 -n 1 "https://127.0.0.1:18090" -body "data={{ randomDate \"YMD\" }}" -verbose 0
+./http_bench -c 1 -n 1 "https://127.0.0.1:18090" -body "data={{ randomDate 'YMD' }}" -verbose 0
 ```
 
 **(4) 生成指定大小的随机字符串**  
@@ -212,10 +212,10 @@ Function:
 Example:  
 
 Client Request Example:
-./http_bench -c 1 -n 1 "https://127.0.0.1:18090?data={{ date \"YMD\" }}" -verbose 0
+./http_bench -c 1 -n 1 "https://127.0.0.1:18090?data={{ date 'YMD' }}" -verbose 0
 
 Body Request Example:
-./http_bench -c 1 -n 1 "https://127.0.0.1:18090" -body "data={{ date \"YMD\" }}" -verbose 0
+./http_bench -c 1 -n 1 "https://127.0.0.1:18090" -body "data={{ date 'YMD' }}" -verbose 0
 ```
 
 **(7) UUID标识（如果异常返回一个唯一随机字符串）**  
diff --git a/http_bench_test.go b/http_bench_test.go
index 48ec3d6..eda88d8 100644
--- a/http_bench_test.go
+++ b/http_bench_test.go
@@ -352,6 +352,7 @@ func tcpHandleConnection(conn net.Conn) error {
 func TestStressTCP(t *testing.T) {
 	name := "tcp"
 	body := "this is stress body"
+	bodyHex := "746869732069732073747265737320626f6479"
 	listen := "127.0.0.1:18091"
 	srv, err := net.Listen("tcp", listen)
 	if err != nil {
@@ -389,7 +390,7 @@ func TestStressTCP(t *testing.T) {
 			isErr: false,
 		},
 		{
-			args:  fmt.Sprintf(`-c 1 -d %ds -p %s -body "{{ stringToHex '%s' }}" -url %s`, duration, name, body, listen),
+			args:  fmt.Sprintf(`-c 1 -d %ds -p %s -bodytype hex -body %s -url %s`, duration, name, bodyHex, listen),
 			isErr: false,
 		},
 	} {
diff --git a/http_utils.go b/http_utils.go
index bc1020f..c996a12 100644
--- a/http_utils.go
+++ b/http_utils.go
@@ -149,8 +149,7 @@ func hexToString(hexStr string) string {
 
 func stringToHex(s string) string {
 	data := []byte(s)
-	hexStr := hex.EncodeToString(data)
-	return hexStr
+	return hex.EncodeToString(data)
 }
 
 func parseTime(timeStr string) int64 {