谷歌CheckCookie鏈接做什麼？

Question

我發現了一個代碼，它以編程方式登錄到Google帳戶後打開此鏈接。
這個鏈接的目的是什麼？

https://www.google.com/accounts/CheckCookie?chtml=LoginDoneHtml

Answer 1

After Successfully logged in this url gets all old cookiees which stored in browser in request header and verify with server and update it if any changes. 

generally this cookie always changed during each request 

1. __utma, 
2. __utmb, 
3. __utmc, 
4. __utmz. 

看到在Firefox中改變的cookie使用firecookie插件的現場演示。