This link will allow someone to log into the application as the current user and navigate directly to the current url /debug/version. It expires in 24 hours, making it safer than a permalink when you just need to send it to someone for some quick research.
This link will allow someone to log into the application as the current user and navigate directly to the current url /debug/version. It never expires, so if it falls into the wrong hands, an attacker can exploit it forever.
Please consider when to use it, and do so only for use in secure environments when a time limited option won't work (such as logging a bug in TFS). If you just need to send it to someone for some quick research, use the permalink with expiration.