@Nullable
        public <T extends HttpService> T findService(ServiceRequestContext ctx,
                                                     Class<? extends T> serviceClass) {
            for (Routed<RouteDecoratingService> routed : router.findAll(ctx.routingContext())) {
                if (routed.isPresent()) {
                    final T service = routed.value().decorator().as(serviceClass);
                    if (service != null) {
                        return service;
                    }
                }
            }
            return unwrap().as(serviceClass);
        }
Adds the specified {@code prefix} to this {@code decorator}.
core/src/main/java/com/linecorp/armeria/internal/server/RouteDecoratingService.java