# Mapping Errors to Status Codes

To get the status code that matches an error, call the `StatusFor` function:

```go
status := httpapi.StatusFor(err)
```

It checks the categories in this order:

| Error | Status code |
|---|---|
| `nil` | `200 OK` |
| `httpapi.ErrUnauthorized` | `401 Unauthorized` |
| `httpapi.ErrForbidden` | `403 Forbidden` |
| `httpapi.ErrTooLarge` | `413 Request Entity Too Large` |
| `httpapi.ErrUnsupportedMediaType` | `415 Unsupported Media Type` |
| `httpapi.ErrMalformed` | `400 Bad Request` |
| `httpapi.ErrNotFound`, `query.ErrNoItems` | `404 Not Found` |
| `architecturekit.ErrDomain` | `422 Unprocessable Entity` |
| `architecturekit.ErrConflict` | `409 Conflict` |
| `architecturekit.ErrTransient` | `503 Service Unavailable` |
| any other error | `500 Internal Server Error` |