Function rest_node_service_get_payload_size 

async fn rest_node_service_get_payload_size<S>(
    __arg0: State<Arc<S>>,
    headers: HeaderMap,
    __arg2: Query<GetPayloadSizeRequest>,
) -> Result<Json<PayloadSizeResponse>, RestError>
where
    S: NodeService + Send + Sync + 'static,

GetPayloadSize - JSON endpoint.

GET /v2/node/payload-size