idempotency-key-in-flight

Status 409. The type of this problem is the address of this page.

What happened

The first request under this key is still running. Acting on the second one as well would do the work twice, and answering it would mean waiting for an answer that does not exist yet.

What to do

Wait, then send the same request again under the same key. Once the first request has finished, the repeat gets its answer back. A key whose first request never finished, because its process died, is free again after http-api.idempotency.in_flight_ttl seconds.