Using APN to check the browser type and version in APM

I am trying to create an access profile that checks for the browser being used to access my Internet facing application. If the access is not using the supported browser, then I wan to display an information message. I need to know what is being used in the active session and not what is loaded on the users system. My assumption is that this would be an object before the login. It would then branch to a message screen that informs the user they have a non-supported browser (IE or Chrome) or version (IE 10 or better).