class_docstr: Implements the HTTP/1.x protocol.
  
  This class can be on its own for clients, or via `HTTP1ServerConnection`
  for servers.
class_docstr_tok: ["Implements","the","HTTP\/1.x","protocol",".","This","class","can","be","on","its","own","for","clients",",","or","via","`","HTTP1ServerConnection","`","for","servers","."]
code: def _on_connection_close(self) -> None:
      # Note that this callback is only registered on the IOStream
      # when we have finished reading the request and are waiting for
      # the application to produce its response.
      if self._close_callback is not None:
          callback = self._close_callback
          self._close_callback = None
          callback()
      if not self._finish_future.done():
          future_set_result_unless_cancelled(self._finish_future, None)
      self._clear_callbacks()
  
imports: import asyncio
  import logging
  import re
  import types
  from tornado.concurrent import Future, future_add_done_callback, future_set_result_unless_cancelled
  from tornado.escape import native_str, utf8
  from tornado import gen
  from tornado import httputil
  from tornado import iostream
  from tornado.log import gen_log, app_log
  from tornado.util import GzipDecompressor
  from typing import cast, Optional, Type, Awaitable, Callable, Union, Tuple
label_desc: Use image node_id 5 for calling the HTTP1Connection obj's underlying member method code with example usage: obj._on_connection_close() without return types