message: also show http headers
diff: @@ -6,6 +6,9 @@ app.get('/', function (req, res) {
  Object.keys(process.env).map(key => {
  result.push(`${key}=${process.env[key]}`)
  })
  + Object.keys(req.headers).map(key => {
  + result.push(`${key}=${req.headers[key]}`)
  + })
  result.sort()
  res.send(result.join("<br />"))
  