docstr: return authenticated headers if the user has provided a token
code: def _headers(self):
      """return authenticated headers if the user has provided a token"""
      headers = None
      if self.token:
          headers = {"Authorization": "Bearer %s" % self.token}
      return headers
  
imports: import logging
  import platform
  import time
  import datetime
  import sys
  import os
  import json
  import threading
  from functools import partial
  import inspect
  import textwrap
label_desc: Use image node_id 5 for calling the WMSLogger obj's underlying member method code with example usage: obj._headers() and returns: headers