# idempotency_in_flight

> A request with this Idempotency-Key is still running. This request was not sent (`sent: false`); the earlier one may still execute.

Source: https://tickwire.io/docs/errors/idempotency_in_flight/

HTTP 409. Unknown: it may have executed. Resolve it with the same idempotency key before acting.

**Likely cause:** A retry arrived before the first attempt finished, for example after a gateway timeout (504) or a client-side timeout.

**What to do:** Wait Retry-After seconds, then repeat with the same key: once the first attempt finishes you get its stored result. Never switch to a new key while the outcome is open, and check positions and orders (or the trade status by key) first.

**Retry:** Only with the same `Idempotency-Key` (or `clientId`). The first attempt may have executed; never resend a trade blindly.

Listed under [Orders and idempotency](https://tickwire.io/docs/errors/#orders-and-idempotency) in [Errors](https://tickwire.io/docs/errors/). Send the error's `requestId` to support and we can find the request.