Cannot connect to node.js/express.js server. (ERR_EMPTY_RESPONSE)

I cannot connect to my local node.js/express server. I get the error ERR_EMPTY_RESPONSE after ~2 minutes of loading. I'm running the server on the same machine that i am trying to connect from.

Here's my code:

const express = require('express');
const fs = require('fs');
const cookieParser = require('cookie-parser');
const pug = require('pug');

const config = require('./helpers/config.js');
const app = express();

app.engine('pug', require('pug').__express);
app.set('views', './views')
app.set('view engine', 'pug');

app.use(express.static(__dirname + '/public'));
app.use(require('./middlewares/auth'));

app.use(function (req, res, next) {
  console.log("Error!");
  res.status(404);

  if (req.accepts('html')) {
    res.render("404", {url: req.url})
    res.end()
    return
  }else if (req.accepts('json')) {
    res.send({error: 404, message: "Not found!"})
    res.end()
    return
  }

  res.type('txt').send('404 Not found!')
  res.end()
})

app.get('/', function (req, res) {
  console.log("root");
  res.render('index', {message: "Hello World!"})
  res.end()
})

app.listen(3000, function() {
  console.log('Listening on port 3000...');
})

via Theo Sandell