diff --git a/TigoWeb/enums.go b/TigoWeb/enums.go
index 23288f7..07765ae 100644
--- a/TigoWeb/enums.go
+++ b/TigoWeb/enums.go
@@ -2,26 +2,45 @@ package TigoWeb
 
 const Version = "1.6.5"
 
+const (
+	httpLowerGet     = "get"
+	httpLowerHead    = "head"
+	httpLowerPost    = "post"
+	httpLowerPut     = "put"
+	httpLowerDelete  = "delete"
+	httpLowerConnect = "connect"
+	httpLowerOptions = "options"
+	httpLowerTrace   = "trace"
+	httpUpperGet     = "GET"
+	httpUpperHead    = "HEAD"
+	httpUpperPost    = "POST"
+	httpUpperPut     = "PUT"
+	httpUpperDelete  = "DELETE"
+	httpUpperConnect = "CONNECT"
+	httpUpperOptions = "OPTIONS"
+	httpUpperTrace   = "TRACE"
+)
+
 // MethodEnum 根据http请求方式获取对应的函数名
 //   - httpMethod: http请求方式
 func MethodEnum(httpMethod string) string {
 	var MethodMapping = map[string]string{
-		"get":     "Get",
-		"head":    "Head",
-		"post":    "Post",
-		"put":     "Put",
-		"delete":  "Delete",
-		"connect": "Connect",
-		"options": "Options",
-		"trace":   "Trace",
-		"GET":     "Get",
-		"HEAD":    "Head",
-		"POST":    "Post",
-		"PUT":     "Put",
-		"DELETE":  "Delete",
-		"CONNECT": "Connect",
-		"OPTIONS": "Options",
-		"TRACE":   "Trace",
+		httpLowerGet:     "Get",
+		httpLowerHead:    "Head",
+		httpLowerPost:    "Post",
+		httpLowerPut:     "Put",
+		httpLowerDelete:  "Delete",
+		httpLowerConnect: "Connect",
+		httpLowerOptions: "Options",
+		httpLowerTrace:   "Trace",
+		httpUpperGet:     "Get",
+		httpUpperHead:    "Head",
+		httpUpperPost:    "Post",
+		httpUpperPut:     "Put",
+		httpUpperDelete:  "Delete",
+		httpUpperConnect: "Connect",
+		httpUpperOptions: "Options",
+		httpUpperTrace:   "Trace",
 	}
 	return MethodMapping[httpMethod]
 }