code: def stop(self):
      # Shutdown
      if self._thread is None:
          return True
  
      _log.info("Triggering shutdown")
      try:
          path = _build_path("shutdown")
          url = "http://{0}:{1}/{2}".format(self.ip, self.port, path)
          r = requests.post(url)
          _log.debug(r)
      except (
          requests.exceptions.RequestException
      ) as e:  # pragma: no cover
          _log.info("Dashboard stop failed: {0}".format(e))
          return False
  
      if self._thread is not None:
          self._thread.join(timeout=5.0)
          if self._thread.is_alive():
              _log.error("Thread still alive despite shutdown called.")
              return False
  
          self._thread = None
  
      return True
  
imports: from IPython import display
  import re
  import requests
  import threading
  import os
  from .None import _udash
  from gevent.pywsgi import WSGIServer
  from flask import Flask
  import socket
  import random
  from string import Template
  import logging
label_desc: Use image node_id 3 for calling the AppRunner obj's underlying member method code with example usage: obj.stop() and returns: True, True, False, False