How to detect invalid server responses using REST API calls to create sensors?

1

If the server response is 200 OK then everything is OK, but what if it is 401 INVALID or any other invalid message? How will I know? The API call is part of a YAML config like this:

sensor:
  - platform: rest
    resource: https://<some valid remote API URL>
    method: GET
    headers: 
      Authorization: <my secret authorization token>
    value_template: '{{ <some valid JSON attribute> }}'
    name: Name-Of-Sensor
2

Try something like this:

value_template: '{{ <some valid JSON attribute> if <some valid JSON attribute> else 0 }}'
3

That’s not a good reply. The status code is not returned in a JSON attribute. That’s why I’m asking.
401 errors returns an HTML response while i.e. a 406 returns a JSON response. There’s no way to know that in advance except by analysing the status code.
So how can I fetch the status code?