What it means
unknown print-option key.
How to handle it
Remove the unknown print option or choose a supported key from meta.allowed.
Wire contract
| Code | invalid_option |
|---|---|
| Class | invalid_request |
| HTTP status | 400 |
| Meta keys | allowed |
| Raised | Yes |
The response uses the standard {"error": {…}} envelope. Branch on error.code, not the human-readable message. Preserve request_id when reporting a failure.