working config for nodejs and drupal 8 integration.

nodejs.config.js

settings = {
  scheme: 'http',
  port: 8080,
  host: 'localhost',
  resource: '/socket.io',
  serviceKey: 'any-id-same-as-in-drupal-config',
  backend: {
    port: 80,
    host: 'site-host-name',
    scheme: 'http',
    basePath: '',
    messagePath: '/nodejs/message'
  },
  debug: true,
  sslKeyPath: '',
  sslCertPath: '',
  sslCAPath: '',
  baseAuthPath: '/nodejs/',
  extensions: [],
  clientsCanWriteToChannels: false,
  clientsCanWriteToClients: false,
  transports: ['websocket', 'polling'],
  jsMinification: true,
  jsEtag: true,
  logLevel: 1
};