code: def send_status_code(self, status_code):
      self.send_response(status_code)
      self.send_header("Content-Length", 0)
      self.end_headers()
  
imports: import collections
  import logging
  import socket
  import socketserver
  import threading
  from http.server import HTTPServer, SimpleHTTPRequestHandler
  from horovod.runner.util.network import find_port
  from horovod.runner.util.threads import in_thread
label_desc: Use image node_id 3 for calling the KVStoreHandler obj's underlying member method code with example usage: obj.send_status_code(status_code) without return types