addMonth example

        $template = $this->getTemplateName();
        if ($template === null) {
            return;
        }

        $this->viewRenderer->Action()->View()->loadTemplate($template);

        foreach ($this->headers as $name => $value) {
            if ($name === 'Expires' && $value === null) {
                $value = Zend_Date::now()->addMonth(1)->get(Zend_Date::RFC_1123);
            } elseif ($name === 'Last-Modified' && $value === null) {
                $value = Zend_Date::now();
                $value = $value->get(Zend_Date::RFC_1123);
            } elseif ($name === 'Content-Type' && $value === null) {
                $front = $args->getSubject()->Front();
                $value = 'application/javascript; charset=' . $front->getParam('charset');
            }

            $this->viewRenderer->Action()->Response()->headers->set($name, $value, true);
        }
    }