code: public URLNormalizer removeDefaultPort() {
          URL u = toURL();
          if ("http".equalsIgnoreCase(u.getProtocol())
                  && u.getPort() == HttpURL.DEFAULT_HTTP_PORT) {
              url = url.replaceFirst(":" + HttpURL.DEFAULT_HTTP_PORT, "");
          } else if ("https".equalsIgnoreCase(u.getProtocol())
                  && u.getPort() == HttpURL.DEFAULT_HTTPS_PORT) {
              url = url.replaceFirst(":" + HttpURL.DEFAULT_HTTPS_PORT, "");
          }
          return this;
      }
docs: Removes the default port (80 for http, and 443 for https).<p>
  <code>http://www.example.com:80/bar.html &rarr;
  http://www.example.com/bar.html</code>
  @return this instance