4xx Client errors
422 Unprocessable Content
The request is well formed but its data doesn't pass validation.
Common causes
- A required field is empty, or a value is invalid (like a bad email address).
How to fix it
- Read the error details in the response body and correct the data.
Find out the moment your site returns 422
Spot Downtime monitors count this as down and alert you, since visitors see an error. (The public “Is it down?” checker treats 4xx answers from big sites as online, because many refuse automated requests.)