private static boolean hasWebSocketService(UpdatableServerConfig config) {
        return config.serviceConfigs()
                     .stream()
                     .anyMatch(serviceConfig -> serviceConfig.service().as(WebSocketService.class) != null);
    }
Reconfigure Server configuration. This feature is only available once a server is configured
and started. We do not allow ports to be reconfigured.
core/src/main/java/com/linecorp/armeria/server/Server.java