Function rest_availability_service_get_payload_range 

async fn rest_availability_service_get_payload_range<S>(
    __arg0: State<Arc<S>>,
    headers: HeaderMap,
    __arg2: Query<GetPayloadRangeRequest>,
) -> Result<Json<PayloadRangeResponse>, RestError>
where
    S: AvailabilityService + Send + Sync + 'static,

GetPayloadRange - JSON endpoint.

GET /v2/availability/payload-range