test-server.js

const http = require('http');
const url = require('url');
const fs = require('fs');
const path = require('path');
const port = process.argv[2] || 9000;

http.createServer(function (req, res) {
    console.log(`${req.method} ${req.url}`);

    // parse URL
    const parsedUrl = url.parse(req.url);
    // extract URL path
    let pathname = 'TestData/' + `.${parsedUrl.pathname}`;
    // based on the URL path, extract the file extention. e.g. .js, .doc, ...
    const ext = path.parse(pathname).ext;
    // maps file extention to MIME typere
    const map = {
        '.ico': 'image/x-icon',
        '.html': 'text/html',
        '.js': 'text/javascript',
        '.json': 'application/json',
        '.css': 'text/css',
        '.png': 'image/png',
        '.jpg': 'image/jpeg',
        '.wav': 'audio/wav',
        '.mp3': 'audio/mpeg',
        '.svg': 'image/svg+xml',
        '.pdf': 'application/pdf',
        '.csv': 'text/csv'
    };

    // Website you wish to allow to connect
    res.setHeader('Access-Control-Allow-Origin', '*');

    // Request methods you wish to allow
    res.setHeader('Access-Control-Allow-Methods', 'GET, POST, OPTIONS, PUT, PATCH, DELETE');

    // Request headers you wish to allow
    res.setHeader('Access-Control-Allow-Headers', 'X-Requested-With,content-type');

    // Set to true if you need the website to include cookies in the requests sent
    // to the API (e.g. in case you use sessions)
    res.setHeader('Access-Control-Allow-Credentials', true);

    fs.exists(pathname, function (exist) {
        if (!exist) {
            // if the file is not found, return 404
            res.statusCode = 404;
            res.end(`File ${pathname} not found!`);
            return;
        }

        // if is a directory send the contents of the directory
        if (fs.statSync(pathname).isDirectory()) {
            fs.readdir(pathname, function(err, files) {
                if(!err) {
                    res.setHeader('Content-type', 'text/plain');
                    res.end(files.join('\n'));
                }
            });
        } else {
            // read file from file system
            fs.readFile(pathname, function (err, data) {
                if (err) {
                    res.statusCode = 500;
                    res.end(`Error getting the file: ${err}.`);
                } else {
                    // if the file is found, set Content-type and send data
                    res.setHeader('Content-type', map[ext] || 'text/plain');
                    res.end(data);
                }
            });
        }
            

    });


}).listen(parseInt(port));

console.log(`Server listening on port ${port}`);