cors should Change the way

I have try the middleware,but it does not work
I find an easy way to handle this,maybe you can change
I copy from https://studygolang.com/articles/25389

crs := cors.New(cors.Options{
		AllowedOrigins:   []string{"*"}, // allows everything, use that to change the hosts.
		AllowCredentials: true,
	})
app:= iris.New()
app.Use(crs())

unlike

crs := cors.New(cors.Options{
		AllowedOrigins:   []string{"*"}, // allows everything, use that to change the hosts.
		AllowCredentials: true,
	})

	v1 := app.Party("/api/v1", crs).AllowMethods(iris.MethodOptions)`

Start by reproducing the reported behavior with the two CORS configurations shown in the issue: app.Use(crs()) and app.Party("/api/v1", crs).AllowMethods(iris.MethodOptions). Trace the middleware and route setup to determine the expected handling of CORS and OPTIONS requests. Done means the documented configuration works consistently without weakening the stated origin or credential behavior.