String result = DocumentUtil.encodeUrl("http://example.com/100%25/done");
        assertEquals("http://example.com/100%25/done", result);
    }

    @Test
    public void test_encodeUrl_curlyBraces() {
        // CharUtil.isUrlChar does NOT include { }, so they get percent-encoded
        String result = DocumentUtil.encodeUrl("http://example.com/{id}");
        assertEquals("http://example.com/%7Bid%7D", result);