code: public static StringBuilder newURIBuilder(String scheme, String server, int port) {
          StringBuilder builder = new StringBuilder();
          appendSchemeHostPort(builder, scheme, server, port);
          return builder;
      }
docs: Create a new URI StringBuilder from the arguments, handling IPv6 host encoding and default ports
  
  @param scheme the URI scheme
  @param server the URI server
  @param port   the URI port
  @return a StringBuilder containing URI prefix