code: def MultiRequestHandler(server):
      t = threading.Thread(target=server.serve_forever)
      t.start()
      try:
          yield
      finally:
          server.stop()
          t.join()
  
imports: import contextlib
  import pickle
  import random
  import socket
  import sys
  import threading
  import time
  import psutil
  import pytest
  import retrying
  from fiftyone.service.ipc import IPCServer, send_request
  from fiftyone.service.util import find_processes_by_args, get_listening_tcp_ports, normalize_wrapper_process, send_ipc_message
label_desc: Use image node_id 3 for calling a global function with example usage: MultiRequestHandler(server) without return types