code: def _handle_exception(
      self,
      typ: "Optional[Type[BaseException]]",
      value: Optional[BaseException],
      tb: Optional[TracebackType],
  ) -> bool:
      if self.final_callback is not None:
          self._remove_timeout()
          if isinstance(value, StreamClosedError):
              if value.real_error is None:
                  value = HTTPStreamClosedError("Stream closed")
              else:
                  value = value.real_error
          self._run_callback(
              HTTPResponse(
                  self.request,
                  599,
                  error=value,
                  request_time=self.io_loop.time() - self.start_time,
                  start_time=self.start_wall_time,
              )
          )
  
          if hasattr(self, "stream"):
              # TODO: this may cause a StreamClosedError to be raised
              # by the connection's Future.  Should we cancel the
              # connection more gracefully?
              self.stream.close()
          return True
      else:
          # If our callback has already been called, we are probably
          # catching an exception that is not caused by us but rather
          # some child of our callback. Rather than drop it on the floor,
          # pass it along, unless it's just the stream being closed.
          return isinstance(value, StreamClosedError)
  
imports: from tornado.escape import _unicode
  from tornado import gen, version
  from tornado.httpclient import HTTPResponse, HTTPError, AsyncHTTPClient, main, _RequestProxy, HTTPRequest
  from tornado import httputil
  from tornado.http1connection import HTTP1Connection, HTTP1ConnectionParameters
  from tornado.ioloop import IOLoop
  from tornado.iostream import StreamClosedError, IOStream
  from tornado.netutil import Resolver, OverrideResolver, _client_ssl_defaults, is_valid_ip
  from tornado.log import gen_log
  from tornado.tcpclient import TCPClient
  import base64
  import collections
  import copy
  import functools
  import re
  import socket
  import ssl
  import sys
  import time
  from io import BytesIO
  import urllib.parse
  from typing import Dict, Any, Callable, Optional, Type, Union
  from types import TracebackType
  import typing
label_desc: Use image node_id 8 for calling the _HTTPConnection obj's underlying member method code with example usage: obj._handle_exception(typ, value, tb) and returns: True, isinstance