public function getAjaxReloadUrl()
    {
        if ($this->_ajaxReloadUrl === null) {
            $this->_ajaxReloadUrl = $this->_getUrl('varnish/ajax/reload', array(
                '_secure' => Mage::app()->getStore()->isCurrentlySecure()
            ));
        }
        
        return $this->_ajaxReloadUrl;
    }