function execute() {
		/**
		 * 2015-11-29
		 * @see \Magento\Framework\App\Response\Http::setNoCacheHeaders()
		 * https://github.com/magento/magento2/blob/2.0.0/lib/internal/Magento/Framework/App/Response/Http.php#L133-L138
		 */
		df_response_code(200);
		df_response_content_type("image/{$this->type()}");
		df_response_cache_max();
		$c = $this->contents(); /** @var string $c */
		df_response_headers(['Content-Length' => strlen($c), 'Content-Transfer-Encoding' => 'binary']);
		$this->_actionFlag->set('', self::FLAG_NO_POST_DISPATCH, true);
		df_response()->setBody($c);
	}