add middleware for CORS with default options

net/ghttp/ghttp_middleware_cors.go

@@ -0,0 +1,13 @@
+// Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
+//
+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with this file,
+// You can obtain one at https://github.com/gogf/gf.
+
+package ghttp
+
+// MiddlewareCORS is a middleware handler for CORS with default options.
+func MiddlewareCORS(r *Request) {
+	r.Response.CORSDefault()
+	r.Middleware.Next()
+}