code: public Observable<Page<ExpressRouteCircuitAuthorizationInner>> listAsync(final String resourceGroupName, final String circuitName) {
          return listWithServiceResponseAsync(resourceGroupName, circuitName)
              .map(new Func1<ServiceResponse<Page<ExpressRouteCircuitAuthorizationInner>>, Page<ExpressRouteCircuitAuthorizationInner>>() {
                  @Override
                  public Page<ExpressRouteCircuitAuthorizationInner> call(ServiceResponse<Page<ExpressRouteCircuitAuthorizationInner>> response) {
                      return response.body();
                  }
              });
      }
docs: Gets all authorizations in an express route circuit.
  
  @param resourceGroupName The name of the resource group.
  @param circuitName The name of the circuit.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;ExpressRouteCircuitAuthorizationInner&gt; object