https://docs.aws.amazon.com/AmazonS3/latest/userguide/access...
(I don't know anything about this personally, but since a lot of people are indicating an interest in this detail of the story, figured I'd try and surface that link better!)
[1] If they ever actually turn off path-style addressing, come find me and I'll PayPal you a dollar. I don't think it'll ever happen.