code: func replyWithJSON(w http.ResponseWriter, obj interface{}) error {
  	w.Header().Set("Content-Type", "application/json; charset=utf-8")
  	w.WriteHeader(http.StatusOK)
  	enc := json.NewEncoder(w)
  	enc.SetIndent("", "  ")
  	enc.SetEscapeHTML(false)
  	return enc.Encode(obj)
  }
docs: // replyWithJSON sends StatusOK with JSON body.