Node.js sending and receiving file using only 'http' and 'fs' module (no framework)

run.js

var http = require("http");
var fs = require("fs");
var server = http.createServer().listen(3000);

server.on("request", function(req, res) {
  if (req.method != "POST") return res.end();
  var imageName = "received-" + Date.now() + ".jpg";
  var writeStream = fs.createWriteStream(imageName);

  req.pipe(writeStream);

  req.on("end", function() {
    res.writeHead(200, { "Content-Type": "text/plain" });
    res.end("saved as:\n\t" + imageName);
  });
});

console.log("Listening on port 3000");

var options = {
  hostname: "localhost",
  port: 3000,
  method: "POST",
  headers: {
    "Content-Type": "application/x-www-form-urlencoded",
    "Content-Length": fs.statSync("send.jpg").size
  }
};

var req = http.request(options, function(res) {
  console.log("STATUS:", res.statusCode);
  console.log("HEADERS:", JSON.stringify(res.headers));

  res.setEncoding("utf8");

  res.on("data", function(chunk) {
    console.log("Response chunk:", chunk);
  });

  res.on("end", function() {
    console.log("Request End");
  });
});

req.on("error", function(e) {
  console.log("Problem with request:", e.message);
});

var readStream = fs.createReadStream("send.jpg");

readStream.pipe(req);