The basic configuration registers health check services and calls the Health Checks Middleware to respond at a URL endpoint with a health response. By default, no specific health checks are registered to test any particular dependency or subsystem. The app is considered healthy if it can respond at the health endpoint URL. The default response writer writes HealthStatus as a plaintext response to the client. The HealthStatus is HealthStatus.Healthy, HealthStatus.Degraded, or HealthStatus.Unhealthy.