server.js

const http = require("http"),
    fs = require("fs"),
    url = require("url"),
    path = require("path");
let server = http.createServer(function(request, response) {
    let pathObj = url.parse(request.url, true);
    if (pathObj.pathname === "/" || pathObj === "/index")
        pathObj.pathname = "/index.html";
    let filePath = path.join(path.resolve(), decodeURI(pathObj.pathname));
    let mime = ((ext = path.extname(filePath)) => {
        let t = {
            ".png": "image/png",
            ".js": "application/javascript",
            ".css": "text/css",
            ".mp3": "audio/mpeg",
        };
        return t[ext] || "text/html";
    })();
    fs.readFile(filePath, "binary", function(err, fileContent) {
        if (err) {
            console.log("404 " + filePath);
            response.writeHead(404, "not found");
            response.end("<h1>404 Not Found</h1>");
        }
        else {
            console.log("ok " + filePath);
            response.setHeader("Content-Type", mime);
            response.write(fileContent, "binary");
            response.end();
        }
    });
});
server.listen(3000);
console.log("visit http://localhost:3000 \nenter 'exit' to close the program.");
let rl = require("readline").createInterface({input: process.stdin});
rl.on("line", async line => {
    if (line.trim() === "exit") {
        server.close();
        process.exitCode = 0;
        rl.close();
    }
});