private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.tasks.v2beta2.AppEngineHttpRequest,
            com.google.cloud.tasks.v2beta2.AppEngineHttpRequest.Builder,
            com.google.cloud.tasks.v2beta2.AppEngineHttpRequestOrBuilder>
        getAppEngineHttpRequestFieldBuilder() {
      if (appEngineHttpRequestBuilder_ == null) {
        if (!(payloadTypeCase_ == 3)) {
          payloadType_ = com.google.cloud.tasks.v2beta2.AppEngineHttpRequest.getDefaultInstance();
        }
        appEngineHttpRequestBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.tasks.v2beta2.AppEngineHttpRequest,
                com.google.cloud.tasks.v2beta2.AppEngineHttpRequest.Builder,
                com.google.cloud.tasks.v2beta2.AppEngineHttpRequestOrBuilder>(
                (com.google.cloud.tasks.v2beta2.AppEngineHttpRequest) payloadType_,
                getParentForChildren(),
                isClean());
        payloadType_ = null;
      }
      payloadTypeCase_ = 3;
      onChanged();
      return appEngineHttpRequestBuilder_;
    }
<pre>
App Engine HTTP request that is sent to the task's target. Can
be set only if
[app_engine_http_target][google.cloud.tasks.v2beta2.Queue.app_engine_http_target]
is set on the queue.

An App Engine task is a task that has
[AppEngineHttpRequest][google.cloud.tasks.v2beta2.AppEngineHttpRequest]
set.
</pre>

<code>.google.cloud.tasks.v2beta2.AppEngineHttpRequest app_engine_http_request = 3;</code>
java-tasks/proto-google-cloud-tasks-v2beta2/src/main/java/com/google/cloud/tasks/v2beta2/Task.java