code: public static KieServerControllerClient newWebSocketClient(final String controllerUrl,
                                                                 final String token,
                                                                 final EventHandler handler) {
          return new WebSocketKieServerControllerClient(controllerUrl,
                                                        null,
                                                        null,
                                                        token,
                                                        handler);
      }
docs: Creates a new Kie Controller Client using Web Socket based service
  @param controllerUrl the URL to the server (e.g.: "ws://localhost:8080/kie-server-controller/websocket/controller")
  @param token token
  @param handler notification handler for controller events
  @return client instance