Function rest_catchup_service_get_catchup_blocks_frontier 

async fn rest_catchup_service_get_catchup_blocks_frontier<S>(
    __arg0: State<Arc<S>>,
    headers: HeaderMap,
    __arg2: Query<GetCatchupBlocksFrontierRequest>,
) -> Result<Json<MerklePathResponse>, RestError>
where
    S: CatchupService + Send + Sync + 'static,

GetCatchupBlocksFrontier - JSON endpoint.

GET /v2/catchup/blocks-frontier