code: def initialize(self, io_loop, max_clients=10, defaults=None):
      super(CurlAsyncHTTPClient, self).initialize(
          io_loop, defaults=defaults
      )
      self._multi = pycurl.CurlMulti()
      self._multi.setopt(pycurl.M_TIMERFUNCTION, self._set_timeout)
      self._multi.setopt(pycurl.M_SOCKETFUNCTION, self._handle_socket)
      self._curls = [self._curl_create() for i in range(max_clients)]
      self._free_list = self._curls[:]
      self._requests = collections.deque()
      self._fds = {}
      self._timeout = None
  
      # libcurl has bugs that sometimes cause it to not report all
      # relevant file descriptors and timeouts to TIMERFUNCTION/
      # SOCKETFUNCTION.  Mitigate the effects of such bugs by
      # forcing a periodic scan of all active requests.
      self._force_timeout_callback = ioloop.PeriodicCallback(
          self._handle_force_timeout, 1000, io_loop=io_loop
      )
      self._force_timeout_callback.start()
  
      # Work around a bug in libcurl 7.29.0: Some fields in the curl
      # multi object are initialized lazily, and its destructor will
      # segfault if it is destroyed without having been used.  Add
      # and remove a dummy handle to make sure everything is
      # initialized.
      dummy_curl_handle = pycurl.Curl()
      self._multi.add_handle(dummy_curl_handle)
      self._multi.remove_handle(dummy_curl_handle)
  
imports: from __future__ import absolute_import, division, print_function
  import collections
  import functools
  import logging
  import pycurl
  import threading
  import time
  from io import BytesIO
  from tornado import httputil
  from tornado import ioloop
  from tornado import stack_context
  from tornado.escape import utf8, native_str
  from tornado.httpclient import HTTPResponse, HTTPError, AsyncHTTPClient, main
label_desc: Use image node_id 1 for calling the CurlAsyncHTTPClient obj's underlying member method code with example usage: obj.initialize(io_loop, max_clients, defaults) without return types