# idempotency_key_reused

> The Idempotency-Key was used before with a different request body. A key names one request; a different request needs a new key.

HTTP `422` · `retryable` is `false`

A key you send in `Idempotency-Key` stands for one request: retrying with the same key and the same body returns the
first result. This request reused a key with a different body, so Kabu cannot tell whether it is a retry.

**What to do:** use a new key for a new request. To retry, send exactly the same body as the first time.

## The response

Every error comes as `application/problem+json`; [Errors](/docs/errors) explains each field.

```json
{
  "type": "https://usekabu.com/docs/errors/idempotency_key_reused",
  "title": "Idempotency key reused",
  "status": 422,
  "code": "idempotency_key_reused",
  "detail": "…",
  "hint": "…",
  "retryable": false,
  "request_id": "req_…",
  "doc_url": "https://usekabu.com/docs/errors/idempotency_key_reused"
}
```