probot/server.js

let process = require('process');
let http = require('http');
let createHandler = require('github-webhook-handler');
let webhook = createHandler({ path: '/', secret: 'secret' });
let GitHubApi = require('github');
let github = new GitHubApi();

github.authenticate({
  type: 'oauth',
  token: process.env['GITHUB_TOKEN']
});

http.createServer(function (req, res) {
  webhook(req, res, function (err) {
    res.statusCode = 404
    res.end('no such location')
  })
}).listen(3000);

let autoresponder = require('./behaviors/autoresponder.js');
autoresponder(webhook, github);