code: def server_close(self):
      pass
  
file_path: altair/altair/utils/server.py
imports: import sys
  import threading
  import webbrowser
  import socket
  from http import server
  from io import BytesIO
  import itertools
  import random
label_desc: Use image node_id 3 for calling the MockServer obj's underlying member method code with example usage: obj.server_close() without return types