what is document.cookie="sess="; document.location="/"?

You log in to a开发者_JAVA技巧n application and the server sets the following cookie: Set-cookie: sess=ab11298f7eg14; When you click the logout button, this causes the following client-side script to execute: document.cookie="sess="; document.location="/"; What conclusion would you draw from this behaviour?

That they are using session ids stored in a cookie for authorization. When you logout, they reset the value of the cookie named "sess" (the wrong way, they should use a negative expiration date instead of a empty value to delete it). They den redirect you to "/", ie their start page.