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407 first, then a 401

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RFC 3261 §22 — last checked 2026-10
RFC 7616 — last checked 2026-10

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Checked 2026-10: these cards use cyphermonkeylabs.com, which returned HTTP 200. cyphermonkeylabs.github.io returned 301 to that host. cipher0x9.github.io returned 404, so it is not linked.

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