APM Branch rule based on Referring URL

Hi,

I am in the process of setting up the F5 as an ADFS proxy for O365 as well as for other services. I need to configure a APM check that looks to see where the referral request came from and based on that assign a path. For eg-- for O365 the referer will contain "login.microsoftonline.com" while for remedy it will contain "onbmc.com". Basically I want to create a check which says - if the request came from Microsoft use this path and for everything else use this path.

Can this be done using session variables ? or do I have to use an irule to create custom session variables and then use those variables ?

In a bind here and any help would be appreciated.

thanks,

Karthik

I have attached a Fiddler session capture.