test1.js

var http = require('http');
var fs = require('fs');
// write out numbers
function writeNumbers(res) {
    var counter = 0;
}
// increment global, write to client
for (var i = 0; i < 100; i++) {
    counter++;
    res.write(counter.toString() + '\n');
}
// create http server
http.createServer(function(req, res) {
    var query = require('url').parse(req.url).query;
    var app = require('querystring').parse(query).file + ".txt";
    // content header
    res.writeHead(200, {
        'Content-Type': 'text/plain'
    });
    // write out numbers
    writeNumbers(res);
    // timer to open file and read contents
    setTimeout(function() {
        console.log('opening ' + app);
        // open and read in file contents
        fs.readFile(app, 'utf8', function(err, data) {
            if (err)
                res.write('Could not find or open file for reading\n');
            else {
                res.write(data);
            }
            // response is done
            res.end();
        });
    }, 2000);
}).listen(8124);
console.log('Server running at 8124');