IDEMPOTENCY_IN_PROGRESS

The first request with this key is still running.

HTTP status	409
Group	Platform
Retryable	Yes — the same request may be sent again

What happened

Two identical requests arrived at once; only one may proceed.

What to do

Wait briefly and retry with the same key — you will get the first request’s result.

The problem document

Every error is application/problem+json (RFC 9457) with the same shape:

{
  "type": "https://docs.co-relayer.com/errors/idempotency-in-progress",
  "title": "The first request with this key is still running.",
  "status": 409,
  "detail": "A sentence about this specific occurrence.",
  "instance": "req_01JB…",
  "code": "IDEMPOTENCY_IN_PROGRESS",
  "retryable": true,
  "hint": "Wait briefly and retry with the same key — you will get the first request’s result."
}

See the error model for what each member means and how to handle unknown codes.