@Override
    public void registerClient(Client client, IAsyncResultHandler<Void> handler) {
        super.registerClient(client, result -> {
            if (result.isSuccess()) {
                register(client);
            }
            handler.handle(result);
            rewrite();
         });
    }
@author Marc Savy {@literal <marc@rhymewithgravy.com>}
gateway/test/src/test/java/io/apiman/gateway/test/junit/vertx3/ApiToFileRegistry.java