public Builder mergeAppEngineHttpRequest(
        com.google.cloud.tasks.v2beta2.AppEngineHttpRequest value) {
      if (appEngineHttpRequestBuilder_ == null) {
        if (payloadTypeCase_ == 3
            && payloadType_
                != com.google.cloud.tasks.v2beta2.AppEngineHttpRequest.getDefaultInstance()) {
          payloadType_ =
              com.google.cloud.tasks.v2beta2.AppEngineHttpRequest.newBuilder(
                      (com.google.cloud.tasks.v2beta2.AppEngineHttpRequest) payloadType_)
                  .mergeFrom(value)
                  .buildPartial();
        } else {
          payloadType_ = value;
        }
        onChanged();
      } else {
        if (payloadTypeCase_ == 3) {
          appEngineHttpRequestBuilder_.mergeFrom(value);
        } else {
          appEngineHttpRequestBuilder_.setMessage(value);
        }
      }
      payloadTypeCase_ = 3;
      return this;
    }
<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