parallel45 API error
idempotency_request_in_progress
A request with this idempotency key is still in progress
Published ahead of the API. No endpoint emits this code yet — error
exits currently carry type: "about:blank". Read this as the intended contract,
not as a description of live behaviour. About this catalogue
- Problem
type - https://errors.parallel45.tech/idempotency_request_in_progress
- HTTP status
- 409
- Retryable
- Yes — the identical request may succeed later.
What it means
The first request under this key has not finished; its result is not stored yet.
The same request is genuinely in flight. This is a concurrency race, not a caller defect -- a double-tap, or a retry that overtook the original. It is refused rather than risking a double execution.
What to do
Wait briefly and retry with the same key. Once the first call settles, the retry returns its stored result.
Do not confuse this with
idempotency_key_reused. Same status, opposite retryability. This is the pair P45DEV-946 named first among the collapses that must never happen.