code: def on_connection_close(self) -> None:
      del self._chunks
  
imports: import socket
  import ssl
  from tornado.escape import native_str
  from tornado.http1connection import HTTP1ServerConnection, HTTP1ConnectionParameters
  from tornado import httputil
  from tornado import iostream
  from tornado import netutil
  from tornado.tcpserver import TCPServer
  from tornado.util import Configurable
  import typing
  from typing import Union, Any, Dict, Callable, List, Type, Tuple, Optional, Awaitable
label_desc: Use image node_id 5 for calling the _CallableAdapter obj's underlying member method code with example usage: obj.on_connection_close() without return types