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CANCEL, then 487
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Sources and go deeper
- RFC 3261 — last checked 2026-10
- RFC 3261 §21 — last checked 2026-10
- RFC 3261 §8.1.1.7 — last checked 2026-10
- RFC 6141 — last checked 2026-10
- RFC 3261 §12 — last checked 2026-10
- RFC 3261 §13 — last checked 2026-10