public static JettyService of(Server jettyServer, @Nullable String hostname) {
        return of(jettyServer, hostname, false);
    }
Creates a new {@link JettyService} from an existing Jetty {@link Server}.

@param jettyServer the Jetty {@link Server}
@param hostname the default hostname, or {@code null} to use Armeria's default virtual host name.
jetty/jetty11/src/main/java/com/linecorp/armeria/server/jetty/JettyService.java