file_server.js

const fs = require("fs"),
  url = require("url"),
  path = require("path"),
  http = require("http");

let root = path.resolve(process.argv[2] || ".");
console.log(`static root dir ${root}`);

let server = http.createServer((request, response) => {
  let pathname = url.parse(request.url).pathname;
  let filepath = path.join(root, pathname);
  console.log(`pathname is ${pathname}`);
  console.log(`filepath is ${filepath}`);
  fs.stat(filepath, function(err, stats) {
    if (!err && stats.isFile()) {
      console.log(`200 ${request.url}`);
      response.writeHead(200);
      fs.createReadStream(filepath).pipe(response);
    } else {
      console.log(`404 ${request.url}`);
      response.writeHead(404);
      response.end(`404 not found`);
    }
  });
});

server.listen(4444);
console.log(`server is running at http://127.0.0.1:4444`);