code: public Observable<Page<RouteFilterRuleInner>> listByRouteFilterAsync(final String resourceGroupName, final String routeFilterName) {
          return listByRouteFilterWithServiceResponseAsync(resourceGroupName, routeFilterName)
              .map(new Func1<ServiceResponse<Page<RouteFilterRuleInner>>, Page<RouteFilterRuleInner>>() {
                  @Override
                  public Page<RouteFilterRuleInner> call(ServiceResponse<Page<RouteFilterRuleInner>> response) {
                      return response.body();
                  }
              });
      }
docs: Gets all RouteFilterRules in a route filter.
  
  @param resourceGroupName The name of the resource group.
  @param routeFilterName The name of the route filter.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;RouteFilterRuleInner&gt; object