hstspreload.org
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Automatically prune stale entries
There is a Chromium bug for this, but here's an issue for this repo.
Depends on #35.
Based on discussions at the HSTS preload list meetup, Firefox and Microsoft might be willing to pull from the canonical source of truth (#76) without additional filtering if we implement at least the same level of pruning they currently have. (That is, removing domains that reply over HTTPS but do not have a header that meets the appropriate requirements.)
s/over HSTS/over HTTPS/
I looked into this today. Unfortunately, the preload list is growing several thousand domains per Chrome release. Even optimistically, the new growth would catch up with removed entries in a few months.