# idempotency_in_progress

A request with this Idempotency-Key is still executing. What causes the BioFlow API's idempotency_in_progress error (HTTP 409) and how to fix it.

HTTP 409 · `application/problem+json` · A request with this Idempotency-Key is still executing.

## What causes it

- A request with the same `Idempotency-Key` is still executing — usually a rapid retry racing the original attempt.

## How to fix it

- Wait briefly and retry with the SAME key; you'll get the original request's result once it settles.

## Example response body

```json
{
  "type": "https://getbioflow.com/docs/api/errors/idempotency-in-progress",
  "title": "A request with this Idempotency-Key is still executing",
  "status": 409,
  "instance": "urn:request:req_01abc",
  "code": "idempotency_in_progress",
  "request_id": "req_01abc"
}
```

Branch on the stable `code` field — `title` and `detail` are for humans and may
change. `type` (`https://getbioflow.com/docs/api/errors/idempotency-in-progress`) always resolves to this page. Quote
`request_id` when contacting support. Full code registry on the
[API docs hub](/docs/api#errors); the complete surface is in the
[interactive reference](/docs/api-reference).