application/json media type:
code field holds the HTTP status as a number, not a text token. The machine-readable token is in title. Branch on title, not on code.
Field definitions
code– The HTTP status code, as an integer. It repeats the status of the response.title– A short machine-readable token for the error class. Use this value for programmatic handling.message– A human-readable description of what went wrong.
Client errors
Authentication runs in the application that hosts the admin surface, ahead of the configuration routes. A request that fails authentication receives a 401 from that host application, in its own error format. Refer to the API reference of the application whose configuration you manage.

