express work parameters

param.js

var express = require('express')
var app = express()

app.put('/message/:id', function (req, res) {
    var id = req.params.id
    var str = require('crypto')
        .createHash('sha1')
        .update(new Date().toDateString().toString() + id)
        .digest('hex')
    res.send(str)
})

app.listen(process.argv[2])