@Override
            public ApiFuture<ListNodesPagedResponse> getFuturePagedResponse(
                UnaryCallable<ListNodesRequest, ListNodesResponse> callable,
                ListNodesRequest request,
                ApiCallContext context,
                ApiFuture<ListNodesResponse> futureResponse) {
              PageContext<ListNodesRequest, ListNodesResponse, Node> pageContext =
                  PageContext.create(callable, LIST_NODES_PAGE_STR_DESC, request, context);
              return ListNodesPagedResponse.createAsync(pageContext, futureResponse);
            }
The default scopes of the service.
java-tpu/google-cloud-tpu/src/main/java/com/google/cloud/tpu/v2alpha1/stub/TpuStubSettings.java