def delay!(uri)
      delay = delay(uri)
      sleep delay - (Time.now - @last_accessed) if delay
      @last_accessed = Time.now
    end
def delay!(uri)
      delay = delay(uri)
      sleep delay - (Time.now - @last_accessed) if delay
      @last_accessed = Time.now
    end
Sleep for the amount of time necessary to obey the Crawl-Delay specified by the server