@Override
  public <RequestT, ResponseT> UnaryCallable<RequestT, ResponseT> createUnaryCallable(
      HttpJsonCallSettings<RequestT, ResponseT> httpJsonCallSettings,
      UnaryCallSettings<RequestT, ResponseT> callSettings,
      ClientContext clientContext) {
    return HttpJsonCallableFactory.createUnaryCallable(
        httpJsonCallSettings, callSettings, clientContext);
  }
REST callable factory implementation for the Workflows service API.

<p>This class is for advanced usage.
java-workflows/google-cloud-workflows/src/main/java/com/google/cloud/workflows/v1beta/stub/HttpJsonWorkflowsCallableFactory.java