code: public SimpleUriRouter<I, O> addUri(String uri, RequestHandler<I, O> handler) {
          routes.add(new Route(new ServletStyleUriConstraintKey<I>(uri, ""), handler));
          return this;
      }
docs: Add a new URI -&lt; Handler route to this router.
  @param uri URI to match.
  @param handler Request handler.
  @return The updated router.