It actually is, for exact URL matches: if you try to submit a URL that has a recent exact match, it will just redirect you to that submission instead of creating a new one.
Does it do any URL cleaning, removing fragments, maybe normalizing shortlinks?
No idea, I haven't ever intentionally tried to break it, I've just noticed it redirect me sometimes. I always clean my own links before attempting to submit.
Re:DNS record "hn.algolia.com" is gone
by nubinetwork on Monday October 09, 2023 @04:34PM
(#37825167)
Except when it doesn't and people submit the same link several times a week
@dang It would be great if this duplicate search functionality was embedded in the HN submission form ;-)