Error 400: invalid format
IndexNow could not read the request. The request had an invalid format, for example a malformed URL list or a broken JSON structure.
Common causes
- A URL in the list is not a valid absolute http or https address.
- The key or the host is missing or malformed.
- The request body was not valid JSON.
How to fix it
- Use full addresses that start with https:// or http://.
- Remove blank or broken lines from the list.
- Check the key against the key format: 8 to 128 letters, numbers and dashes.