java.net.url在代码扫描期间提供安全漏洞

Question

我有以下方法来检查传入URL是否有效，并且基于此方法，我需要重定向到错误页面。

/*
 * This method is used to validate the URL and return a response
 */
private static int isValidUrl(String qrUrl) {
    int code = 0;
     try {
            URL url = new URL(qrUrl);
            HttpURLConnection connection = (HttpURLConnection)url.openConnection();
            connection.setRequestMethod("GET");
            connection.connect();
            code = connection.getResponseCode();  
            logger.info("Response code is {} for the url", code);
        } catch(MalformedURLException e) {
            logger.error("A MalformedURLException Occured in QR Code servlet during URL Validation", e);
        } catch (IOException e) {
            logger.error("An IOException Occured in QR Code servlet during URL Validation", e);
        } 
    return code;
    

}

以下代码为中等安全漏洞（描述： 在代码扫描期间，攻击者可以使用此Web服务器请求来揭示内部服务和文件系统）。我该如何修复？