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@freakazoid Maybe something changed with how archive.org operates, but for quite a long time my plugin would redirect me to an empty archive page asking me if I want to save it. I click "save", and the page retrieval worked. That means archive.org was directly accessing the website, not me. But it no longer works, and now the captchas are being stored by archive.org.
@freakazoid It's possible that archive.org has started shipping j/s that causes the visitor to grab the page and feed the page to archive.org. That would explain the current behaviour.