test.js

var httprequest = require('request'),
    async = require('async'),
    requests = [],
    page,
    maxPage = 50,
    url = "http://www.google.com/?p=";

//Callback which each Request hits
function performAfterLoadAttempt(error, response, body) {
    "use strict";

    //Log the Body
    console.log(body);
}

function addToRequestArray(page) {
    "use strict";

    requests.push(function () {
        httprequest(url + page, performAfterLoadAttempt);
    });
}

//Fill the Array with one Function per Page
for (page = 0; page < maxPage; page += 1) {
    addToRequestArray(page);
}

//And now execute them all together
async.parallel(requests);