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","."]
docstr: Clears the callback attributes.
  
  This allows the request handler to be garbage collected more
  quickly in CPython by breaking up reference cycles.
docstr_tok: ["Clears","the","callback","attributes",".","This","allows","the","request","handler","to","be","garbage","collected","more","quickly","in","CPython","by","breaking","up","reference","cycles","."]
code: def _clear_callbacks(self):
      """Clears the callback attributes.
  
      This allows the request handler to be garbage collected more
      quickly in CPython by breaking up reference cycles.
      """
      self._write_callback = None
      self._write_future = None
      self._close_callback = None
      if self.stream is not None:
          self.stream.set_close_callback(None)
  
imports: from __future__ import absolute_import, division, print_function
  import re
  from tornado.concurrent import Future
  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 import stack_context
  from tornado.util import GzipDecompressor, PY3
label_desc: Use image node_id 4 for calling the HTTP1Connection obj's underlying member method code with example usage: obj._clear_callbacks() without return types