Feature of HandleFunc in Go?

Question

go

func index(w http.ResponseWriter, r *http.Request)  {
  fmt.Println("Index page")
}

Why is ResponseWriter passed simply and Request with a pointer?

Answer 1

Well, probably because ResponseWriter is an interface, that is, in fact, it is the pointer that is passed.
And Request is a structure.

Answer 2

piotrzurek.net/2013/09/20/pointers-in-go.html

Well, probably because ResponseWriter is an interface, that is, in fact, it is the pointer that is passed.
And Request is a structure.

something like that.