public static String getContentIdentity(String content) {
        
        if (!verifyIncrementPubContent(content)) {
            return null;
        }
        
        Matcher matcher = URL_PATTERN.matcher(content);
        StringBuilder buf = new StringBuilder();
        if (matcher.find()) {
            String scheme = matcher.group(1);
            String address = matcher.group(2);
            String port = matcher.group(3);
            if (scheme != null) {
                buf.append(scheme);
            }
            buf.append(address);
            if (port != null) {
                buf.append(port);
            }
        }
        return buf.toString();
    }
@Test
    void testGetContentIdentity() {
        
        String url = "http://127.0.0.1:8080/test?paramA=A&paramB=B";
        assertEquals("http://127.0.0.1:8080", UrlAnalysisUtils.getContentIdentity(url));
        
        String url2 = "127.0.0.1:8080/test?paramA=A&paramB=B";
        assertEquals("127.0.0.1:8080", UrlAnalysisUtils.getContentIdentity(url2));
        
        String url3 = "";
        assertNull(UrlAnalysisUtils.getContentIdentity(url3));
    }