Currently, all REST API endpoints require authentication.
This is rather inconvenient for making sure that HA is alive because you’d need to pass token wherever you want that even if you don’t need to access an API.
I suggest adding simple enpoint like /api/isalive which will return 204 if HA is alive and well and 503 when startup isn’t completely finished.
This can be used for e.g. container HEALTHCHECK command.