code: function createServer(webhook)
  {
    var self = this
  
    var onError = this.emit.bind(this, 'error')
  
    var port     = webhook.port     || 0
    var hostname = webhook.hostname || HOSTNAME
  
    var server = http.createServer(function(req, res)
    {
      if(req.method === 'GET')
      {
        res.end()
  
        return self.push(parse(req.url).query)
      }
  
      req.pipe(concat(function(body)
      {
        res.end()
  
        self.push(body.toString())
      }))
    })
    .listen(port, hostname, function()
    {
      var address = this.address()
  
      if(hostname === HOSTNAME) hostname = getHostname()
  
      if(!hostname)
      {
        self.emit('error', new Error("There's no public available interfaces"))
  
        return this.close()
      }
  
      self.emit('open', 'http://'+hostname+':'+address.port)
    })
    .on('error'      , onError)
    .on('clientError', onError)
  
    return server
  }
docs: Create an ad-hoc web server where to receive the webhook notifications
  
  @param {Object} webhook
  @param {string} [webhook.hostname='0.0.0.0']
  @param {Number} [webhook.port=0]
  
  @return {http.Server}