var xhr = new XMLHttpRequest();
var url = _spPageContextInfo.webAbsoluteUrl;
if (url === "undefined") {
    console.log("_spPageContextInfo.webAbsoluteUrl undefined");
    url = "http://siteUrl";
}
//xhr.open('GET', url +"/_api/web/Lists?$select=Id,Title,Hidden,ItemCount");
xhr.open('GET', url + "/_api/web");
xhr.setRequestHeader("Accept", "application/json; odata=verbose");
xhr.setRequestHeader("Connection", "close");
xhr.onload = function () {
    if (xhr.status === 200) {
        var kk = JSON.parse(xhr.responseText);
        console.dir(kk);
    }
    else {
        console.dir(xhr);
        alert('Request failed.  Returned status of ' + xhr.status);
    }
};
xhr.send();