http-with-gzip.js

const http = require('http');
const fs = require('fs');
const path = require('path');
const zlib = require('zlib');

const PORT = 3001;
const STATIC_DIRECTORY = path.resolve(__dirname, '../build/');
const cache = {};

const getStaticFile = fileName => {
    if (fileName in cache) return cache[fileName];

    const fileBuffer = fs.readFileSync(path.resolve(STATIC_DIRECTORY, fileName.replace(/^\//, '')));

    const compressedFile = zlib.gzipSync(fileBuffer.toString(), {
        level: zlib.constants.Z_BEST_COMPRESSION,
    });
    cache[fileName] = compressedFile;

    return compressedFile;
};

const getContentType = fileName => {
    const contentTypes = {
        '.js': 'application/javascript',
        '.css': 'text/css',
        '.png': 'image/png',
        '.woff': 'font/woff; charset=UTF-8',
        '.woff2': 'font/woff2',
    };

    const extensionMatch = fileName.match(/\.[a-zA-Z]*$/);
    return extensionMatch ? contentTypes[extensionMatch[0]] : null;
};

const server = http.createServer((req, res) => {
    const requestPath = req.url.replace(/\?.*/, '').replace('/connect', '/');

    res.setHeader('Content-Encoding', 'gzip');
    res.setHeader('status', 200);

    if (requestPath === '/') {
        res.setHeader('Content-Type', 'text/html');
        res.end(getStaticFile('index.html'));
        return;
    }

    res.setHeader('Cache-Control', 'max-age=31536000');
    const contentType = getContentType(requestPath);

    if (contentType) res.setHeader('Content-Type', contentType);

    const file = getStaticFile(requestPath);

    if (file) {
        setTimeout(() => {
            res.end(file);
        }, 100);
    } else {
        res.setHeader('status', 404);
        res.end(`<h1>No ${requestPath} for you!</h1>`);
    }
});

server.listen(PORT);

console.info(`Server is probably ready on http://localhost:${PORT}`);