gistfile1.js

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

urls = ['http://i.imgur.com/M75xU.jpg',
        'http://i.imgur.com/sKhEM.jpg',
        'http://i.imgur.com/ZvgN0.jpg',
        'http://i.imgur.com/PsRlb.jpg',
        'http://i.imgur.com/RxOTo.jpg',
        'http://i.imgur.com/Fr22q.jpg']
        
        
app.get('/', function(req, res){
  res.send('');
})

app.get('/add/user/:id', function(req, res){
  res.send('user '+req.params.id)
})

app.get('/add/avatar/:id', function(req, res){
  res.send('avatar: '+req.params.id)
})

app.listen(8000)

urls[Math.round(Math.random()*(urls.length-1))]

console.log("Server running at http://127.0.0.1:8000/")