Node Server responding with dynamic HTML by parsing html file as string

server-htmldynamic.js

var http = require('http');
var fs = require('fs');

http.createServer(function(req, res) {
    // Specify html content type
    res.writeHead(200, { 'Content-Type': 'text/html' });

    // Read contents of index.htm file synchronously,
    // Saved as string in var html.
    // Use 'utf8' param to specify encoding and ensure you are 
    // dealing with a string rather than a buffer.
    var html = fs.readFileSync(__dirname + '/index2.htm', 'utf8');

    var message = 'Bostom Creme Donut';

    // Takes html string and replaces instances of 
    // '{Message}' with value of message var
    html = html.replace('{Message}', message);

    // Send contents of index.htm file as body of response
    res.end(html);
}).listen(1337, '127.0.0.1');