code: def _guess_api_handler():
      """Fallback to guess API handler by availability"""
      try:
          from notebook.base.handlers import APIHandler
      except ImportError:
          from jupyter_server.base.handlers import APIHandler
      global _APIHandler
      _APIHandler = APIHandler
      return _APIHandler
  
label_desc: Use image node_id 1 for calling a global function with example usage: _guess_api_handler() and returns: _APIHandler