@Override
    protected URLConnection openConnection(URL url) throws IOException {
        url = new URL(url, url.toExternalForm(), getDefaultStreamHandler(url.getProtocol()));
        return new NtlmHttpURLConnection((HttpURLConnection) url.openConnection());
    }

    private static URLStreamHandler getDefaultStreamHandler(final String protocol) throws IOException {
        synchronized (PROTOCOL_HANDLERS) {

    protected URLConnection openConnection(URL url) throws IOException {
        url = new URL(url, url.toExternalForm(), getDefaultStreamHandler(url.getProtocol()));
        return new NtlmHttpURLConnection((HttpURLConnection) url.openConnection(), this.transportContext);
    }

    private static URLStreamHandler getDefaultStreamHandler(final String protocol) throws IOException {
        synchronized (PROTOCOL_HANDLERS) {