http-readFile.js

const http = require("http");
const fs = require("fs");
const { promisify } = require("util");

// convert callback To Async
// const readAsync = promisify(fs.readFile);

// convert CB to Async with promise
const readAsync = fileName => {
  return new Promise((resolve, reject) => {
    fs.readFile(fileName, (err, data) => {
      if (err) reject(err);
      resolve(data);
    });
  });
};

const server = async () => {
  const html = await readAsync("index.html");
  console.log(html.length);
  http
    .createServer((req, res) => {
      res.writeHead(200, {
        "Content-Length": html.length,
        "Content-Type": "text/html"
      });
      res.end(html);
    })
    .listen(3030);
};

server();