public Builder mergeAppEngineHttpQueue(
        com.google.cloud.tasks.v2beta3.AppEngineHttpQueue value) {
      if (appEngineHttpQueueBuilder_ == null) {
        if (queueTypeCase_ == 3
            && queueType_
                != com.google.cloud.tasks.v2beta3.AppEngineHttpQueue.getDefaultInstance()) {
          queueType_ =
              com.google.cloud.tasks.v2beta3.AppEngineHttpQueue.newBuilder(
                      (com.google.cloud.tasks.v2beta3.AppEngineHttpQueue) queueType_)
                  .mergeFrom(value)
                  .buildPartial();
        } else {
          queueType_ = value;
        }
        onChanged();
      } else {
        if (queueTypeCase_ == 3) {
          appEngineHttpQueueBuilder_.mergeFrom(value);
        } else {
          appEngineHttpQueueBuilder_.setMessage(value);
        }
      }
      queueTypeCase_ = 3;
      return this;
    }
<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