# `IDEMPOTENCY_IN_FLIGHT` Original request still in progress

Source: https://checkslip.com/en/problems/idempotency-in-flight

- **HTTP status**: `409`
- **Credit**: No credit taken

## Meaning

A request with this `Idempotency-Key` is still being processed, so it was not repeated.

## Fix

Wait for `Retry-After`, then resend with the same key and body to get the first request's result.

## Example response

```
{
  "type": "https://checkslip.com/problems/idempotency-in-flight",
  "title": "Original request still in progress",
  "status": 409,
  "code": "IDEMPOTENCY_IN_FLIGHT",
  "instance": "01a18600-0000-7000-8000-000000000000"
}
```