class_docstr: Abstract router interface.
class_docstr_tok: ["Abstract","router","interface","."]
code: def start_request(self, server_conn, request_conn):
      return _RoutingDelegate(self, server_conn, request_conn)
  
imports: from __future__ import absolute_import, division, print_function
  import re
  from functools import partial
  from tornado import httputil
  from tornado.httpserver import _CallableAdapter
  from tornado.escape import url_escape, url_unescape, utf8
  from tornado.log import app_log
  from tornado.util import basestring_type, import_object, re_unescape, unicode_type
label_desc: Use image node_id 2 for calling the Router obj's underlying member method code with example usage: obj.start_request(server_conn, request_conn) and returns: _RoutingDelegate