Creating a Stateless Request in Magento 2

gistfile1.aw

<?php
class Ai_AjaxCatalog_Controller_Action extends Mage_Core_Controller_Front_Action
{
	public function preDispatch()
	{
		$this->setFlag('', self::FLAG_NO_START_SESSION, 1); // Do not start standard session
		parent::preDispatch();
		return $this;
	}
}

test