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A comment on Firefox’s latest Test Pilot: No More 404s. Parent comment

Re:Firefox’s latest Test Pilot: No More 404s by zeveb on Thursday August 04, 2016 @01:12PM (#12227006)
> To provide cached versions of pages, we send 404 error page URLs to Archive.org.

Why not only do that on a user action, instead of on every single 404?

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Re:Firefox’s latest Test Pilot: No More 404s by rcthompson on Thursday August 04, 2016 @01:20PM (#12227059)
I think that's exactly what the text you quoted is saying. When you actually request the cached page, it sends the URL to Archive.org.
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Re:Firefox’s latest Test Pilot: No More 404s by zeveb on Thursday August 04, 2016 @03:51PM (#12227996)
It could also legitimately mean that they send every 404 page URL to archive.org — that's why I'm asking for clarification.
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