diff --git a/request.go b/request.go
index 6b79f49..bc3e6fe 100644
--- a/request.go
+++ b/request.go
@@ -55,7 +55,7 @@ func (rdl *ResponseDataLocation) IsValid() bool {
 	return false
 }
 
-const (
+var (
 	RequestDataLocationHeader       RequestDataLocation = "HEADER"        // header
 	RequestDataLocationCookie       RequestDataLocation = "COOKIE"        // cookie
 	RequestDataLocationBody         RequestDataLocation = "BODY"          // body
@@ -65,7 +65,7 @@ const (
 	RequestDataLocationCustomConfig RequestDataLocation = "CUSTOM_CONFIG" // 针对接口的一些自定义配置规则
 )
 
-const (
+var (
 	ResponseDataLocationHeader    ResponseDataLocation = "HEADER"    // header
 	ResponseDataLocationCookie    ResponseDataLocation = "COOKIE"    // cookie
 	ResponseDataLocationBody      ResponseDataLocation = "BODY"      // body