get the elapsed time from a server

get_elapsed_time.js

/* usage 
   node get_elapsed_time.js -u localhost -p 8000 */

var start, elapsed, end, argv, http;
argv = require('optimist').argv;
http = require('http');
if (argv.u.length == 0) return console.log('need url');
start = new Date();
http.get({ host : argv.u , port: (argv.p) ? argv.p : 80}, function(res){
   console.log('\nnget console util\n');
   res.on('end', function(){
        end = new Date();
        elapsed = new Date();
        elapsed.setTime(start.getTime() - end.getTime());
        console.log(elapsed.getMilliseconds() + " ms elapsed");
   });
});

test_slow_server.js

var http = require('http');
var s = http.createServer(function(req, res){
 res.writeHead(200, { 'content-type': 'text/plain' });
 res.write("hello \n");
 setTimeout(function(){
  res.end("world\n");
 }, 10000);
});
s.listen(8000)