server.js

var isUseHTTPs = false; // !(!!process.env.PORT || !!process.env.IP);

var server = require(isUseHTTPs ? 'https' : 'http'),
    url = require('url'),
    path = require('path'),
    fs = require('fs');

function serverHandler(request, response) {
    var uri = url.parse(request.url).pathname,
        filename = path.join(process.cwd(), uri);

    var stats;

    try {
        stats = fs.lstatSync(filename);
    } catch (e) {
        response.writeHead(404, {
            'Content-Type': 'text/plain'
        });
        response.write('404 Not Found: ' + path.join('/', uri) + '\n');
        response.end();
        return;
    }

    if (fs.statSync(filename).isDirectory()) {
        filename += '/index.html';
    }


    fs.readFile(filename, 'binary', function(err, file) {
        if (err) {
            response.writeHead(500, {
                'Content-Type': 'text/plain'
            });
            response.write('404 Not Found: ' + path.join('/', uri) + '\n');
            response.end();
            return;
        }

        response.writeHead(200);
        response.write(file, 'binary');
        response.end();
    });
}

var app;

if (isUseHTTPs) {
    var options = {
        key: fs.readFileSync(path.join(__dirname, 'fake-keys/privatekey.pem')),
        cert: fs.readFileSync(path.join(__dirname, 'fake-keys/certificate.pem'))
    };
    app = server.createServer(options, serverHandler);
} else app = server.createServer(serverHandler);

app = app.listen(process.env.PORT || 9001, process.env.IP || "0.0.0.0", function() {
    var addr = app.address();
    console.log("Server listening at", addr.address + ":" + addr.port);
});