code: def __init__(self, method, start_response, context):
      self.method = method
      self.start_response = start_response
      self.context = context
      self._write_buffer = []
      self._finished = False
      self._expected_content_remaining = None
      self._error = None
  
imports: from __future__ import absolute_import, division, print_function
  import sys
  from io import BytesIO
  import tornado
  from tornado.concurrent import Future
  from tornado import escape
  from tornado import httputil
  from tornado.log import access_log
  from tornado import web
  from tornado.escape import native_str
  from tornado.util import unicode_type, PY3
label_desc: Use image node_id 1 to create a new _WSGIConnection object from inherited base classes: httputil with example: obj = _WSGIConnection(method, start_response, context)