docs: public Observable<Page<NetworkInterfaceIPConfigurationInner>> listAsync(final String resourceGroupName, final String networkInterfaceName) {
          return listWithServiceResponseAsync(resourceGroupName, networkInterfaceName)
              .map(new Func1<ServiceResponse<Page<NetworkInterfaceIPConfigurationInner>>, Page<NetworkInterfaceIPConfigurationInner>>() {
                  @Override
                  public Page<NetworkInterfaceIPConfigurationInner> call(ServiceResponse<Page<NetworkInterfaceIPConfigurationInner>> response) {
                      return response.body();
                  }
              });
      }