code: public Observable<ServiceResponse<Page<ExpressRouteCircuitInner>>> listWithServiceResponseAsync() {
          return listSinglePageAsync()
              .concatMap(new Func1<ServiceResponse<Page<ExpressRouteCircuitInner>>, Observable<ServiceResponse<Page<ExpressRouteCircuitInner>>>>() {
                  @Override
                  public Observable<ServiceResponse<Page<ExpressRouteCircuitInner>>> call(ServiceResponse<Page<ExpressRouteCircuitInner>> page) {
                      String nextPageLink = page.body().nextPageLink();
                      if (nextPageLink == null) {
                          return Observable.just(page);
                      }
                      return Observable.just(page).concatWith(listNextWithServiceResponseAsync(nextPageLink));
                  }
              });
      }
docs: Gets all the express route circuits in a subscription.
  
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;ExpressRouteCircuitInner&gt; object