code: func statsIndexHandler() http.Handler {
  	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
  		switch r.Method {
  		case http.MethodGet:
  			getCacheStatsHandler(w, r)
  		default:
  			w.WriteHeader(http.StatusMethodNotAllowed)
  		}
  	})
  }
docs: // index for stats handle