code: public PubsubFuture<Subscription> getSubscription(final String project, final String subscription) {
      return getSubscription(canonicalSubscription(project, subscription));
    }
docs: Get a Pub/Sub subscription.
  
  @param project      The Google Cloud project.
  @param subscription The name of the subscription to get.
  @return A future that is completed when this request is completed. The future will be completed with {@code null}
  if the response is 404.