<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _delay(self):
 """ Pause before making the next HTTP request. """

        if self.next_request_timestamp is None:
            return

        sleep_seconds = self.next_request_timestamp - time.time()
        if sleep_seconds <= 0:
            return
        time.sleep(sleep_seconds)