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I am sure there are numerous caveats to this approach (i.e. situations below which Referer is not sent, likely for staying spammed through bogus Referer URLs), but I am unable to speak to all of these. The Wikipedia page could be a good starting point.知乎,让每一次点击都充满意义 —— 欢迎来到知乎,发现问题背后的世界