断开的请求(或Django中的“断开链接”报告)?

Subject: Broken link on googleads.g.doubleclick.net

Referrer: (url on **my** site!)
Requested URL: /pagead/ads?(...)
User agent: (...)
IP address: (some foreign country) 

所以我看了一下CommonMiddleware,它负责发送这些报告。 事情是这样的( Django 1.1 license

    if response.status_code == 404:
        if settings.SEND_BROKEN_LINK_EMAILS:
            # If the referrer was from an internal link or a non-search-engine site,
            # send a note to the managers.
            domain = request.get_host()
            referer = request.META.get('HTTP_REFERER', None)
            is_internal = _is_internal_request(domain, referer)
            path = request.get_full_path()
            if referer and not _is_ignorable_404(path) and (is_internal or '?' not in referer):
                ua = request.META.get('HTTP_USER_AGENT', '<none>')
                ip = request.META.get('REMOTE_ADDR', '<none>')
                mail_managers("Broken %slink on %s" % ((is_internal and 'INTERNAL ' or ''), domain),
                    "Referrer: %s\nRequested URL: %s\nUser agent: %s\nIP address: %s\n" \
                              % (referer, request.get_full_path(), ua, ip))

代码非常简单,很明显在我收到的电子邮件中 推荐人 . 我不知道这意味着什么——如果是黑客测试,Django中的一些bug,或者我的代码中的一些bug(仅供参考:Django还没有被修补过,还有其他问题) broken link 电子邮件是正确的)。

你知道这里可能出了什么问题吗?