I clicked a link from a 2-year-old Hacker News thread, and Nielsen Norman Group served up a 404 page. On that 404 page, NN/G served up an educational message for visitors who arrive from ChatGPT, Claude, or another LLM:
(Did an AI chat send you here? They sometimes get URLs wrong or hallucinate nonexistent NN/G articles.)
Is this a new best practice for 404 page design?

Afterword
Afterword
I was surprised that this link broken within 2 years. Cool URIs don’t change, which NN/G has traditionally agreed with:
Any URL that has ever been exposed to the Internet should live forever: never let any URL die since doing so means that other sites that link to you will experience linkrot.
In their defense, the old URI offered a 3-day course, and NN/G now only offers a 1-day course. Plus, the 404 page does use plain language and constructively offers steps I can take.
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