private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.tasks.v2beta3.AppEngineHttpQueue,
            com.google.cloud.tasks.v2beta3.AppEngineHttpQueue.Builder,
            com.google.cloud.tasks.v2beta3.AppEngineHttpQueueOrBuilder>
        getAppEngineHttpQueueFieldBuilder() {
      if (appEngineHttpQueueBuilder_ == null) {
        if (!(queueTypeCase_ == 3)) {
          queueType_ = com.google.cloud.tasks.v2beta3.AppEngineHttpQueue.getDefaultInstance();
        }
        appEngineHttpQueueBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.tasks.v2beta3.AppEngineHttpQueue,
                com.google.cloud.tasks.v2beta3.AppEngineHttpQueue.Builder,
                com.google.cloud.tasks.v2beta3.AppEngineHttpQueueOrBuilder>(
                (com.google.cloud.tasks.v2beta3.AppEngineHttpQueue) queueType_,
                getParentForChildren(),
                isClean());
        queueType_ = null;
      }
      queueTypeCase_ = 3;
      onChanged();
      return appEngineHttpQueueBuilder_;
    }
<pre>
[AppEngineHttpQueue][google.cloud.tasks.v2beta3.AppEngineHttpQueue]
settings apply only to [App Engine
tasks][google.cloud.tasks.v2beta3.AppEngineHttpRequest] in this queue.
[Http tasks][google.cloud.tasks.v2beta3.HttpRequest] are not affected by
this proto.
</pre>

<code>.google.cloud.tasks.v2beta3.AppEngineHttpQueue app_engine_http_queue = 3;</code>
java-tasks/proto-google-cloud-tasks-v2beta3/src/main/java/com/google/cloud/tasks/v2beta3/Queue.java