@Override
    public SELF decorator(Route route, Function<? super HttpService, ? extends HttpService> decorator) {
        requireNonNull(route, "route");
        requireNonNull(decorator, "decorator");
        for (String contextPath: contextPaths) {
            addRouteDecoratingService(new RouteDecoratingService(route, contextPath, decorator));
        }
        return self();
    }
Decorates {@link HttpService}s under the specified directory.
The specified decorator(s) is/are executed in reverse order of the insertion.
core/src/main/java/com/linecorp/armeria/server/AbstractContextPathServicesBuilder.java