alt Hacker NewsI think the parent is referring to the possibility that one day, browsers might put up a blanket security warning for HTTP URLs instead of following redirects. Or they might try to be a little too clever with HTTPS upgrades.
In particular, the automatic upgrade feature in modern browsers is based on several heuristics rather than explicit configuration like HSTS, so there's always a bit of room for breakage there. For example, they don't even check if the server returns a 301 redirect, which can be problematic if the server wants to redirect to HTTPS on a different host/port or make some changes to the path.
> Or they might try to be a little too clever with HTTPS upgrades.
They're not going to get any cleverer than they are now. In October we'll finally be done with heuristics or central databses of https-first websites used by the various browsers or the half a dozen of headers that you must dance around to get the upgrade to work securely and reliably. They will just default to https first.
https://blog.google/security/https-by-defau/
Yes this is about Chrome, but all others will follow.