code: public ServiceFuture<List<EndpointServiceResultInner>> listAsync(final String location, final ListOperationCallback<EndpointServiceResultInner> serviceCallback) {
          return AzureServiceFuture.fromPageResponse(
              listSinglePageAsync(location),
              new Func1<String, Observable<ServiceResponse<Page<EndpointServiceResultInner>>>>() {
                  @Override
                  public Observable<ServiceResponse<Page<EndpointServiceResultInner>>> call(String nextPageLink) {
                      return listNextSinglePageAsync(nextPageLink);
                  }
              },
              serviceCallback);
      }
docs: List what values of endpoint services are available for use.
  
  @param location The location to check available endpoint services.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object