Function rest_availability_service_get_header_range 

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

GetHeaderRange - JSON endpoint.

GET /v2/availability/header-range