200 URL error on simple crawler

simplecrawler

var Crawler = require("simplecrawler");
var cheerio = require("cheerio");

var crawler = Crawler("http://www.which.co.uk/sitemap/")
    .on("fetchcomplete", function () {
        console.log("Fetched a resource!")
    });

crawler.discoverResources = function(buffer, queueItem) {
    var $ = cheerio.load(buffer.toString("utf8"));

    return $("a[href]").map(function () {
        return $(this).attr("href");
    }).get();
};

var originalEmit = crawler.emit;
crawler.emit = function(evtName, queueItem) {
    crawler.queue.countItems({ fetched: true }, function(err, completeCount) {
        if (err) {
            throw err;
        }

        crawler.queue.getLength(function(err, length) {
            if (err) {
                throw err;
            }

            console.log("fetched %d of %d — %d open requests, %d open listeners",
                completeCount,
                length,
                crawler._openRequests.length,
                crawler._openListeners);
        });
    });

    console.log(evtName, queueItem ? queueItem.url ? queueItem.url : queueItem : null);
    originalEmit.apply(crawler, arguments);
};

crawler.on("fetchcomplete", function(queueItem, responseBuffer, response) {
    console.log("I just received %s (%d bytes)", queueItem.url, responseBuffer.length);
    console.log("It was a resource of type %s", response.headers['content-type']);
});


crawler.start();