constant replace string

request/request.go

 package request
 
 import (
+	"fmt"
 	"net/http"
 	"runtime"
 
-	"fmt"
 	"github.com/gin-gonic/gin"
 	"github.com/sirupsen/logrus"
 )
 	}
 
 	switch ctx.Request.Method {
-	case "GET", "PUT", "DELETE", "HEAD", "PATCH", "OPTIONS":
+	case http.MethodGet, http.MethodPut, http.MethodDelete, http.MethodHead, http.MethodPatch, http.MethodOptions:
 		ctx.JSON(http.StatusOK, data)
-	case "POST":
+	case http.MethodPost:
 		ctx.JSON(http.StatusCreated, data)
 	default:
 		ctx.JSON(http.StatusBadRequest, HTTPError{Msg: fmt.Sprintf("unsupported request method %s", ctx.Request.Method)})