docs: public ServiceFuture<List<CloudTask>> listAsync(final String jobId, final ListOperationCallback<CloudTask> serviceCallback) {
          return AzureServiceFuture.fromHeaderPageResponse(
              listSinglePageAsync(jobId),
              new Func1<String, Observable<ServiceResponseWithHeaders<Page<CloudTask>, TaskListHeaders>>>() {
                  @Override
                  public Observable<ServiceResponseWithHeaders<Page<CloudTask>, TaskListHeaders>> call(String nextPageLink) {
                      return listNextSinglePageAsync(nextPageLink, null);
                  }
              },
              serviceCallback);
      }