API error codes
| Status code | Description |
|---|---|
| 400 (Bad Request) | Invalid request |
| 401 (Unauthorized) | Authentication error |
| 403 (Forbidden) | Forbidden access |
| 404 (Not Found) | Item not found |
| 408 (Request Timeout) | Request timeout |
| 409 (Conflict) | Conflicting request |
| 411 (Length Required) | Require Content-Length |
| 412 (Precondition Failed) | Precondition failed |
| 416 (Requested Range Not Satisfiable) | Invalid specification of Range header |
| 500 (Internal Error) | Internal error |
| 503 (Service Unavailable) | Service Unavailable |