*
     * @param url
     *            The resource URL. Must not be {@literal null}.
     * @return The external form.
     */
    public static String toExternalForm(final URL url) {
        assertArgumentNotNull("url", url);

        final String s = url.toExternalForm();
        return URLUtil.decode(s, "UTF8");
    }

    /**
     * Returns the file name of the resource.
     *
     * @param url

        assertEquals("http://hoge.com/", value.toExternalForm());

        value = transformer.getBaseUrl("http://hoge.com/", "http://hoge.com/");
        assertEquals("http://hoge.com/", value.toExternalForm());

        value = transformer.getBaseUrl("http://hoge.com/aaa/bbb.html", "http://hoge.com/");
        assertEquals("http://hoge.com/", value.toExternalForm());

        final URL url = ResourceUtil.getResource(toClassFile(referenceClass.getName()));
        final String[] path = referenceClass.getName().split("\\.");
        String baseUrl = url.toExternalForm();
        for (final String element : path) {
            final int pos = baseUrl.lastIndexOf('/');
            baseUrl = baseUrl.substring(0, pos);
        }

    @Override
    protected int getDefaultPort() {
        return DEFAULT_HTTP_PORT;
    }

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

    protected int getDefaultPort() {
        return DEFAULT_HTTP_PORT;
    }

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

        String u = null;
        try {
            final URL childUrl = new URL(url, urlValue.startsWith(":") ? url.getProtocol() + urlValue : urlValue);
            String childUrlStr = childUrl.toExternalForm();
            final String path = childUrl.getPath();
            if (path != null && path.startsWith("/../")) {
                String normalizedPath = path;