| Name | Number | Description |
| OK | 0 | Equivalent to 200 OK |
| Unknown | 1 | Equivalent to 500 Internal Server Error |
| InvalidRequest | 100 | Equivalent to 400 Bad Request |
| AuthenticationError | 101 | Equivalent to 401 Unauthorized |
| AccessDenied | 102 | Equivalent to 401 Unauthorized |
| SecurityTokenExpired | 103 | Equivalent to 401 Unauthorized (more precisely, to the non-standard 419 Authentication Timeout) |
| SecurityTokenRequired | 104 | Equivalent to 401 Unauthorized |
| RequestRejected | 105 | Equivalent to 403 Forbidden |
| NotFound | 106 | Equivalent to 404 Not Found |
| MethodNotSupported | 107 | Equivalent to 405 Method Not Supported |
| InternalError | 108 | Equivalent to 500 Internal Server Error |
| TaskCancelled | 109 | Equivalent to 204 No Content |
| ServerReadOnly | 110 | Equivalent to 503 Service Unavailable |
| NotSupportedInProduction | 1000 | Feature is only supported in development mode |
| UpsourceException | 1001 | Application-level exception |
| FileNotFoundInRevision | 1002 | The requested file was not found (application-specific version of 404 Not Found) |
| RevisionNotIndexed | 1003 | The requested revision is not indexed |
| UpsourceNotReadyException | 2001 | The requested data is not yet available, check back later |
| FileIsTooBig | 2002 | File is too big to be displayed (downloading is possible) |