var prerender = require('koa-prerender');

// Options
var options = {
  prerender: PRERENDER_SERVER_URL   // optional, default:'http://service.prerender.io/'
  protocol: 'http',                 // optional, default: this.protocol
  host: 'www.risingstack.com'       // optional, default: this.host,
  prerenderToken: ''                // optional or process.env.PRERENDER_TOKEN
};

// Use as middleware
app.use(prerender(options));