demo.js

var http = require('http');
 
var simserver = http.createServer(function (req, res) {
    //console.log('req.url:', req.url);
    res.writeHead(200, {'Content-Type': 'text/plain'});
    var count = 10;
    var timerId = setInterval(function() {
        console.log('request count:', count);
        count = count -1;
        if (count > 0) {
            res.write(count + ' ');
        } else {
            res.end('okay');
            clearInterval(timerId);
        }
    }, 1000);
});
 
var portNumber = 8910;
simserver.listen(portNumber, '127.0.0.1', function() {
    console.log('server listens on ' + portNumber);
});