if (!allowUserInteraction) return null;
                try {
                    URL url = getURL();
                    String protocol = url.getProtocol();
                    int port = url.getPort();
                    if (port == -1) {
                        port = "https".equalsIgnoreCase(protocol) ? 443 : 80;
                    }
                    PasswordAuthentication auth =

                        return null;
                    try {
                        URL u = getURL();
                        String protocol = u.getProtocol();
                        int port = u.getPort();
                        if ( port == -1 ) {
                            port = "https".equalsIgnoreCase(protocol) ? 443 : 80;
                        }