Launchpad's archive mirror prober only handles 200 OK responses

According to lib/lp/registry/scripts/distributionmirror_prober.py, lines 108-116:

    def handleStatus(self, version, status, message):
        # According to http://lists.debian.org/deity/2001/10/msg00046.html,
        # apt intentionally handles only '200 OK' responses, so we do the
        # same here.
        if status == str(httplib.OK):
            self.factory.succeeded(status)
        else:
            self.factory.failed(Failure(BadResponseCode(status)))
        self.transport.loseConnection()

However, from Ubuntu Jaunty onwards, this is no longer the case as apt now supports redirects (see bug #18645) and some mirrors may decide to take advantage of this "feature", for which ever reasons, and the mirror prober would fail on their mirrors.