ImageController::cacheAction PHP Method

    public function cacheAction()
    {
        $this->getResponse()->clearHeaders();
        $this->getResponse()->setHeader('Cache-Control', sprintf('public, max-age=%d', 3600 * 24 * 30), true);
        $this->getResponse()->setHeader('Pragma', 'cache', true);
        $this->getResponse()->setHeader('Expires', gmdate(self::DATE_FORMAT, date_create('+30 days')->getTimestamp()), true);
        try {
            $this->_helper->service('image')->generateFromSrc($this->_getParam('src'));
            $this->getResponse()->setHeader('Content-Type', $this->getContentType($this->getPath()), true);
            $this->getResponse()->sendHeaders();
            $this->getResponse()->setBody(file_get_contents($this->getPath()));
        } catch (\Exception $e) {
            $this->getResponse()->clearHeaders();
            $this->getResponse()->setHttpResponseCode(404);
        }
        $this->getResponse()->sendResponse();
        exit;
    }