code: func noCacheHandler(h http.Handler) http.Handler {
  	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
  		w.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate")
  		w.Header().Set("Pragma", "no-cache")
  		w.Header().Set("Expires", "0")
  		h.ServeHTTP(w, r)
  	})
  }
docs: // noCacheHandler sets required HTTP headers to prevent
  // response caching at the client side.