Render 1 pixel jpg image using expressjs

express.js

'use strict';

var express = require('express');
var app = express();

app.get('/1pixel.jpg', function(req,res){
  var
    hex1pixeljpeg = 'ffd8ffe000104a46494600010101006000600000ffe1001645786966000049492a0008000000000000000000ffdb00430001010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101ffdb00430101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101ffc00011080001000103012200021101031101ffc400150001010000000000000000000000000000000affc40014100100000000000000000000000000000000ffc40014010100000000000000000000000000000000ffc40014110100000000000000000000000000000000ffda000c03010002110311003f00bf8001ffd9',
    buffer1PixelJpeg = new Buffer(hex1pixeljpeg, 'hex');

  res
    .set({
      'Content-Type': 'image/jpeg',
      'Content-Length': buffer1PixelJpeg.length
    }) //http://expressjs.com/en/4x/api.html#res.set
    .end(buffer1PixelJpeg,'binary');
});

var server = app.listen(3000, function () {
  var host = server.address().address;
  var port = server.address().port;

  console.log('Example app listening at http://%s:%s', host, port);
});