server.js

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

http.createServer(function (request, response) {
    console.log('request ', request.url);

    var filePath = './public' + request.url;
    if (filePath == './public/') {
        filePath = './public/index.html';
    }

    console.log(filePath)

    var extname = String(path.extname(filePath)).toLowerCase();
    var mimeTypes = {
        '.html': 'text/html',
        '.js': 'text/javascript',
        '.css': 'text/css',
        '.png': 'image/png'
    };

    var contentType = mimeTypes[extname] || 'application/octet-stream';

    fs.readFile(filePath, function(error, content) {
        if (error) {
            fs.readFile('./public/404.html', function(error, content) {
                response.writeHead(200, { 'Content-Type': contentType });
                response.end(content, 'utf-8');
            }); 
        }
        else {
            response.writeHead(200, { 'Content-Type': contentType });
            response.end(content, 'utf-8');
        }
    });

}).listen(8125);
console.log('Server running at http://127.0.0.1:8125/');