docs: public URLNormalizer lowerCaseSchemeHost() {
          URL u = toURL();
          url = Pattern.compile(u.getProtocol(),
                  Pattern.CASE_INSENSITIVE).matcher(url).replaceFirst(
                  u.getProtocol().toLowerCase());
          url = Pattern.compile(u.getHost(),
                  Pattern.CASE_INSENSITIVE).matcher(url).replaceFirst(
                  u.getHost().toLowerCase());
          return this;
      }