private com.google.protobuf.SingleFieldBuilderV3<
            com.google.api.HttpBody,
            com.google.api.HttpBody.Builder,
            com.google.api.HttpBodyOrBuilder>
        getHttpBodyFieldBuilder() {
      if (httpBodyBuilder_ == null) {
        httpBodyBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.api.HttpBody,
                com.google.api.HttpBody.Builder,
                com.google.api.HttpBodyOrBuilder>(getHttpBody(), getParentForChildren(), isClean());
        httpBody_ = null;
      }
      return httpBodyBuilder_;
    }
<pre>
The http body contains the queue.yaml file which used to update queue lists
</pre>

<code>optional .google.api.HttpBody http_body = 2;</code>
java-tasks/proto-google-cloud-tasks-v2beta2/src/main/java/com/google/cloud/tasks/v2beta2/UploadQueueYamlRequest.java