My tries

co_test.js

var fs = require('fs');
var co = require('co');
var express = require('express');
var wrapper = require('co-express');
var app = wrapper(express());
var wait = require('co-wait');

app.get('/test', function* (req, res, next) {
    yield waitAndAnswer(res)
});

function* waitAndAnswer (res) {
  yield wait(10000);
  res.send('Done: ' + Date.now());
}

app.listen(8000);