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Detecting a Meaningful Page Change: A Content Hash, a Line Diff, and Why the AI Summary Runs Last

This story is from 2026-08-28. It is preserved in the archive; the latest stories are on the live feed.

"Watch this page and tell me when it changes" sounds like a one-liner: fetch it, compare it to last time, alert on a difference. Ship that naive version against a real production website and it does one of two useless things. It fires every single run — because the markup carries a rotating CSRF to…

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  1. 2026-08-28 01:29 · DEV Community — AI
    Detecting a Meaningful Page Change: A Content Hash, a Line Diff, and Why the AI Summary Runs Last

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