code: def get_backoff_time(self):
          
          # We want to consider only the last consecutive errors sequence (Ignore redirects).
          consecutive_errors_len = len(list(takewhile(lambda x: x.redirect_location is None,
                                                      reversed(self.history))))
          if consecutive_errors_len <= 1:
              return 0
  
          backoff_value = self.backoff_factor * (2 ** (consecutive_errors_len - 1))
          return min(self.BACKOFF_MAX, backoff_value)
docs: Formula for computing the current backoff
  
          :rtype: float