Parameters can be defined the usual way, using query parameters, in the route. Those parameters can be later accessed by the server side class by implementing the HasPostHydrationMethod interface, like in the example below:

@Route("/home")
public class Home implements HasPostHydrationMethod {

    String id;

    @Override
    public void onHydrated(HttpRequest httpRequest) {
        this.id = httpRequest.getParameterValue("id");
    }
    
}
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For the example above you can pass an id parameter in the url, like this: http://localhgost:8080/myui/home?id=23

When implementing the HasPostHydrationMethod interface, the onHydrated method is called after instantiating and hydrating the java object, for every request.