Gorilla Mux Use() Function Not Working

I want to use the Use() function of the Gorilla Mux package, but I cannot get it to work. It says: r.Use undefined (type *mux.Router has no field or method Use). I used almot the identitcal example from the documentation. My code looks like this.

package main import ( "net/http" "github.com/gorilla/mux" "fmt" ) func simpleMw(next http.Handler) http.Handler { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { fmt.Println(r.RequestURI) next.ServeHTTP(w, r) }) } func handler(w http.ResponseWriter, r *http.Request) { fmt.Fprintf(w, "hello") } func main() { r := mux.NewRouter() r.HandleFunc("/", handler) r.Use(simpleMw) http.Handle("/", r) http.ListenAndServe(":8000", nil) } 

You can find the example of the documentation here: http://www.gorillatoolkit.org/pkg/mux#overview, search for "middleware".

I know I could use this method, but I would like to use the Gorilla package.

Many thanks.