static-files.js

const fs = require('fs');
const path = require('path');
const url = require('url');

function getContentType(url) {
    //
}

module.exports = (req, res) => {
    req.pathname = req.pathname || url.parse(req.url).pathname;

    if(req.pathname.startsWith('/content/') && req.method === 'GET') {
        let filePath = path.normalize(path.join(__dirname, `..${req.pathname}`));

        fs.readFile(filePath, (err, data => {
            if(err) {
                res.WriteHead(404, {
                    'Content-Type': 'text/plain'
                });
            }

            res.write('Resource not found!');
            res.end();
            return;
        }

        res.writeHead(200, {
            'Content-Type': getContentType(req.pathname)
        });
    ));
    } else {
        return true;
    }
}