private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.tasks.v2.AppEngineHttpRequest,
            com.google.cloud.tasks.v2.AppEngineHttpRequest.Builder,
            com.google.cloud.tasks.v2.AppEngineHttpRequestOrBuilder>
        getAppEngineHttpRequestFieldBuilder() {
      if (appEngineHttpRequestBuilder_ == null) {
        if (!(messageTypeCase_ == 2)) {
          messageType_ = com.google.cloud.tasks.v2.AppEngineHttpRequest.getDefaultInstance();
        }
        appEngineHttpRequestBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.tasks.v2.AppEngineHttpRequest,
                com.google.cloud.tasks.v2.AppEngineHttpRequest.Builder,
                com.google.cloud.tasks.v2.AppEngineHttpRequestOrBuilder>(
                (com.google.cloud.tasks.v2.AppEngineHttpRequest) messageType_,
                getParentForChildren(),
                isClean());
        messageType_ = null;
      }
      messageTypeCase_ = 2;
      onChanged();
      return appEngineHttpRequestBuilder_;
    }
<pre>
HTTP request that is sent to the App Engine app handler.

An App Engine task is a task that has
[AppEngineHttpRequest][google.cloud.tasks.v2.AppEngineHttpRequest] set.
</pre>

<code>.google.cloud.tasks.v2.AppEngineHttpRequest app_engine_http_request = 2;</code>
java-tasks/proto-google-cloud-tasks-v2/src/main/java/com/google/cloud/tasks/v2/Task.java