code: def initialize(  # type: ignore
      self,
      max_clients: int = 10,
      defaults: Optional[Dict[str, Any]] = None,
  ) -> None:
      super().initialize(defaults=defaults)
      # Typeshed is incomplete for CurlMulti, so just use Any for now.
      self._multi = pycurl.CurlMulti()  # type: Any
      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()
      )  # type: Deque[Tuple[HTTPRequest, Callable[[HTTPResponse], None], float]]
      self._fds = {}  # type: Dict[int, int]
      self._timeout = None  # type: Optional[object]
  
      # 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
      )
      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: 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.escape import utf8, native_str
  from tornado.httpclient import HTTPRequest, HTTPResponse, HTTPError, AsyncHTTPClient, main
  from tornado.log import app_log
  from typing import Dict, Any, Callable, Union, Optional
  import typing
label_desc: Use image node_id 1 for calling the CurlAsyncHTTPClient obj's underlying member method code with example usage: obj.initialize(max_clients, defaults) without return types