var xhr = new XMLHttpRequest(),
    handler = function (event) {

    var response = request.respondWith('response' in xhr ? xhr.response : xhr.responseText, {
        status: xhr.status === 1223 ? 204 : xhr.status, // IE9 status bug
        statusText: xhr.status === 1223 ? 'No Content' : trim(xhr.statusText)
    });

    each(trim(xhr.getAllResponseHeaders()).split('\n'), function (row) {
        response.headers.append(row.slice(0, row.indexOf(':')), row.slice(row.indexOf(':')   1));
    });

    resolve(response);
};

request.abort = function () {
    return xhr.abort();
};

if (request.progress) {
    if (request.method === 'GET') {
        xhr.addEventListener('progress', request.progress);
    } else if (/^(POST|PUT)$/i.test(request.method)) {
        xhr.upload.addEventListener('progress', request.progress);
    }
}

xhr.open(request.method,request.getUrl(), true);

if ('responseType' in xhr) {
    xhr.responseType = 'blob';
}

if (request.credentials === true) {
    xhr.withCredentials = true;
}

request.headers.forEach(function (value, name) {
    xhr.setRequestHeader(name, value);
});

xhr.timeout = 0;
xhr.onload = handler;
xhr.onerror = handler;
xhr.send(request.getBody());