code: def _spawn(self, func, *args, **kwargs):
          
          gevent.spawn(func, *args, **kwargs)
docs: Spawn a handler function.
  
          Spawns the supplied ``func`` with ``*args`` and ``**kwargs``
          as a gevent greenlet.
  
          :param func: A callable to call.
          :param args: Arguments to ``func``.
          :param kwargs: Keyword arguments to ``func``.