queue-example.js

var http = require('http'),
    queue = require('queue-async');

var urls = [
   '/?0',
   '/?1',
   '/?2',
   '/?3',
   '/?4',
   '/?5',
   '/?6',
   '/?7',
   '/?8',
   '/?9',
];

var q = queue(3);
urls.forEach(function(path){
    var params = {
        hostname: '127.0.0.1',
        port: 80,
        path: path,
        method: 'GET'
    };
    q.defer(function(params, cb) {
        var req = http.request(params, function(res) {
            var body = '';
            res.on('data', function(chunk) {
                body += chunk.toString();
            });
            res.on('end', function() {
                cb(null, body);
            });
        });
        req.end();
    }, params);

});
q.awaitAll(function(error, results) {
    console.log(results);
});