What it means
not an absolute http(s) URL.
How to handle it
Provide an absolute HTTP or HTTPS URL and use meta.reason to identify the rejected URL property.
Wire contract
| Code | invalid_webhook_url |
|---|---|
| Class | invalid_request |
| HTTP status | 400 |
| Meta keys | reason |
| 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.