OPDC API error code

REQUEST_CANCELLED

HTTP status 409

The write was cancelled before it started. 409. Nothing was written; a retry with the same Idempotency-Key runs afresh.

The API answers with a problem document (RFC 9457) whose type is https://twinn.engineering/errors/request-cancelled, and with X-Error-Code: REQUEST_CANCELLED. Branch on the code, never on the detail text.

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