code: @Override
      public void registerUrlConverter(UrlConverter urlConverter) {
          for (String actionName : new ArrayList<String>(actions.keySet())) {
              actionUriToViewName.put(urlConverter.toUrlElement(actionName), actionName);
              actions.put( urlConverter.toUrlElement(actionName), actions.remove(actionName));
          }
          defaultActionName = urlConverter.toUrlElement(defaultActionName);
      }
docs: Register a new {@link grails.web.UrlConverter} with the controller
  
  @param urlConverter The {@link grails.web.UrlConverter} to register