Hi @michau ,
As far as I know, it should be HTTP Status Code: 400 - Bad Request
I’m not aware of any documents that explain all the status codes we serve, but you can get from response header or even guess from what it should be in terms of the HTTP specs, I think:
10.4.1 400 Bad Request
The request could not be understood by the server due to malformed syntax. The client SHOULD NOT repeat the request without modifications.
Best,
Shohei