I think it doesn't have to be the 403 page that Apache would have sent, it may just be one you made yourself, and which somewhat looks like a 403 error page.

Besides, as error pages can always be customized, there's no need for it to ever be the real 403 page.

In reply to Re^2: Need to respond with a 403 status code? by bart
in thread Need to respond with a 403 status code? by JCHallgren

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