docs: def request_patch(self, *args, **kwargs):
      """Maintains the existing api for Session.request.
      Used by all of the higher level methods, e.g. Session.get.
      The background_callback param allows you to do some processing on the
      response in the background, e.g. call resp.json() so that json parsing
      happens in the background thread.
      """
      func = sup = super(FuturesSession, self).request
  
      background_callback = kwargs.pop('background_callback', None)
      if background_callback:
          def wrap(*args_, **kwargs_):
              resp = sup(*args_, **kwargs_)
              # Patch the closure to return the callback.
              return background_callback(self, resp)
  
          func = wrap
      return self.executor.submit(func, *args, **kwargs)