docs: public Observable<Page<AppServiceCertificateOrderInner>> listByResourceGroupAsync(final String resourceGroupName) {
          return listByResourceGroupWithServiceResponseAsync(resourceGroupName)
              .map(new Func1<ServiceResponse<Page<AppServiceCertificateOrderInner>>, Page<AppServiceCertificateOrderInner>>() {
                  @Override
                  public Page<AppServiceCertificateOrderInner> call(ServiceResponse<Page<AppServiceCertificateOrderInner>> response) {
                      return response.body();
                  }
              });
      }