Javascript-форум - Ошибка при загрузке файла: Error: EISDIR: illegal operation on a directory, open

Если лениво файлы качать, выложу исходный код:
server.js

"use strict";

var http = require('http');
var debug = require('debug')('server');

var handler = require('./handler');

var server = new http.Server();

server.on('request', handler);
server.listen(3000, function(err) {
  if (err) throw err;
  debug("listening");
});

handler.js

var debug = require('debug')('server:handler');
var url = require('url');
var config = require('config');
var fs = require('fs');
var path = require('path');
var mime = require('mime');
var Busboy = require('busboy');

module.exports = function(req, res) {
  // /page/my.html -> файл
  // /page/my.html?test=5   -> файл

  var urlParsed = url.parse(req.url);
  //console.dir(req);
  //console.dir(res);

  // ../../../secret.json

  //  /page/my.html
  var pathname = urlParsed.pathname;

  var filePath = path.join(config.publicRoot, pathname);
  console.log(pathname);
  console.log(filePath);
  console.log(req.method);

  if (!filePath.startsWith(config.publicRoot + path.sep)) {
    res.statusCode = 400;
    console.log("Bye-bye silly hacker!");
    res.end("Bye-bye silly hacker!");
    return;
  }

	var file = new fs.ReadStream( filePath );
  if( pathname === '/path/' && req.method.toLowerCase() === 'post' ){
	  var busboy = new Busboy({ headers: req.headers });
	  busboy.on('file', function(fieldname, file, filename, encoding, mimetype) {
		  console.log( fieldname );
		  console.log( file );
		  console.log( filename );
		  console.log( encoding );
		  console.log( mimetype );
		  file.pipe(fs.createWriteStream( filePath ));
	  });
	  busboy.on('finish', function() {
		  res.writeHead(200, { 'Connection': 'close' });
		  res.end("That's all folks!");
	  });
	  return req.pipe(busboy);
  }
  file.pipe(res);


  file.on( 'error', function(err) {
    if (err) {
      if (err.code == 'ENOENT') {
        res.statusCode = 404;
        console.log("ENOENT");
        res.end("404");
      } else {
        res.statusCode = 500;
        res.end("500");
      }
      return;
    }
    res.on( 'close', function(){
      file.destroy();
    });
  });

};

config/default.js

var path = require('path');
module.exports = {

  projectRoot: process.cwd(),
  publicRoot: process.cwd() + path.sep + 'public'

};

public/page/my.html

<!DOCTYPE HTML>
<html>
<head>
  <meta charset="utf-8">
</head>
<body>
<h1>Upload or get or delete file</h1>

<form action="" id="file-upload" enctype="multipart/form-data" >
	<input id="file" type="file">
	<input type="submit" value="Send">
</form>
<button id="get">Get file</button><button id="delete">Delete file</button>
<div id="message"></div>
<script>
	var form = document.getElementById('file-upload');
	var file = document.getElementById('file');
	var getFile = document.getElementById('get');
	var deleteFile = document.getElementById('delete');
	var message = document.getElementById('message');
	getFile.onclick = function( e ){
		var xhr = new XMLHttpRequest();
		xhr.open('GET', '/path/file.zip', true);
		xhr.onload = function ( e ) {
			if (xhr.status === 200) {
				console.dir(xhr);
				console.dir(e);
			} else {
				message.innerHTML = 'Error, please try later';
			}
		};
		xhr.send(formData);
	};
	form.onsubmit = function( e ){
		var newFile = file.files[0];
		var formData = new FormData();
		var xhr = new XMLHttpRequest();

		message.innerHTML = '';
		e.preventDefault();

		if (!newFile.name.match('.zip')) {
			message.innerHTML = 'Please, upload only ZIP files!';
			return;
		}
		
		formData.append('zipfile', newFile);
		xhr.open('POST', '/path/', true);
		xhr.onload = function (data) {
		if (xhr.status === 200) {
			message.innerHTML = 'Uploaded!';
			console.dir( data );
		} else {
			message.innerHTML = 'Error, please try later';
		}
		};
		xhr.send(formData);
	};
</script>
</body>
</html>