# precondition_failed

> The resource changed since you read it. The If-Match header did not match the current version of the resource.

**The resource changed since you read it.** The `If-Match` header did not match the current version of the resource. Someone changed it after you read it.

- **HTTP status:** `412 Precondition Failed`
- **CLI exit code:** `1` (not signed in)
- **Retry:** not as it is; the same request will fail the same way until the cause is fixed

## How to fix it

GET the resource again and retry with the new ETag in If-Match.

## What the response looks like

```json
{
  "type": "https://guv.dev/errors/precondition_failed",
  "title": "The resource changed since you read it",
  "status": 412,
  "code": "precondition_failed",
  "detail": "The `If-Match` header did not match the current version of the resource.",
  "fix": "GET the resource again and retry with the new ETag in If-Match.",
  "docs_url": "https://guv.dev/errors/precondition_failed",
  "request_id": "req_01jbx2m9k7q4r8t5v6w3y0z1rq"
}
```

The `code` field is stable: match on it, not on `title` or `detail`, which may be reworded.