betajs/mock-ajax-server

var Http = require("http");

module.exports = function (sourceUrl, targetUrl, callback) {
    var result = {};
    Http.get(sourceUrl, function (response) {
        result.status = response.statusCode;
        result.contentType = response.headers["content-type"];
        var body = '';
        response.on('data', function(d) {
            body += d;
        });
        response.on('end', function() {
            body = body.replace(/src=['"](.*?)['"]/g, function (dummy, src) {
                if (src.indexOf("://") < 0 && src.indexOf("/") !== 0)
                    src = targetUrl + sourceUrl + "/../" + src;
                return "src='" + src + "'";
            });
            result.data = body;
            callback(result);
        });
    });
};