debug: Rejecting Client without 'rethinkdb-horizon-v0' protocol()

[Skintillion]

Connecting using NativeScript I get this error.

debug: Rejecting client without "rethinkdb-horizon-v0" protocol ().

Horizon Command:

hz serve --dev --debug true --bind all

Nativescript code:

"use strict";
var Horizon = require('@horizon/client');
var horizon = Horizon({host: 'SERVER:8181'}); //Ive tried with  { authType: "unauthenticated" }, {secure: false} 
horizon.onReady(function() {
    console.log("Horizon Online");
})
horizon.connect();

horizon/server/src/server.js

Line 38 in a11ac62

logger.debug(`Rejecting client without "${protocol_name}" protocol (${protocols}).`);

the variable is set correctly

var PROTOCOL_VERSION = 'rethinkdb-horizon-v0';

It's not passing along any protocol information at all.