A node server that will delay it's response by 1000 milliseconds, or ?delay=milliseconds

index.js

var url = require('url');
var http = require('http');
http.createServer(function (req, res) {
  var startTime = Date.now();
  var delay = url.parse(req.url, true).query.delay || 1000;
  setTimeout(function(){
    res.writeHead(200, {'Content-Type': 'text/plain'});
	  res.end('We tried to delay your request by '.concat(
            delay,
            ' milliseconds.\n',
            'In reality it took ',
            (Date.now() - startTime),
            ' milliseconds.\n'
          ));
  },delay)
	  
}).listen(1337, '127.0.0.1');
console.log('Server running at http://127.0.0.1:1337/');
console.log('To get a 3 seconds delay: http://127.0.0.1:1337/?delay=3000');

To run this via node simply download the index.js file and from a command line:

node index