Errors
With basic authentication, if you fail to provide valid authentication credentials the
expected error will be 401 Unauthorized, as shown below.

With token authentication, when an invalid or expired token is used, the expected error
will be 401 Unauthorized. The body of the response will include a
description of the problem, as shown below for the case of an expired token:

If you ask for a data source that does not exist you will receive a proper message in the
error field.
