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sequence_mismatch

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The event changed since the sequence you sent.

HTTP status409
codesequence_mismatch
Retry?No, fix the request first

You sent If-Match with a sequence, but the event now has a different one, or it does not exist yet.

Read the event again (GET), merge your changes and write with the current sequence. If you do not need protection against parallel changes, leave out If-Match.

{
"type": "https://docs.kalender-sync.de/en/api/errors/sequence_mismatch",
"title": "Conflict",
"status": 409,
"code": "sequence_mismatch",
"detail": "The event changed since the sequence you sent.",
"request_id": "req_…"
}

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