code: public Observable<Page<StampCapacityInner>> listCapacitiesNextAsync(final String nextPageLink) {
          return listCapacitiesNextWithServiceResponseAsync(nextPageLink)
              .map(new Func1<ServiceResponse<Page<StampCapacityInner>>, Page<StampCapacityInner>>() {
                  @Override
                  public Page<StampCapacityInner> call(ServiceResponse<Page<StampCapacityInner>> response) {
                      return response.body();
                  }
              });
      }
docs: Get the used, available, and total worker capacity an App Service Environment.
  Get the used, available, and total worker capacity an App Service Environment.
  
  @param nextPageLink The NextLink from the previous successful call to List operation.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;StampCapacityInner&gt; object