code: protected <T extends Controller> void redirect(Class<T> controllerClass){
          redirect(controllerClass, new HashMap<String, String>(0));
      }
docs: Redirects to given controller, action "index" without any parameters.
  
  @param controllerClass controller class where to send redirect.
  @param <T> class extending {@link Controller}
  @return {@link HttpSupport.HttpBuilder}, to accept additional information.