Throught this whole process, if you're unsure whether a Shibboleth login session
worked (such as if it looks like your application isn't getting attributes etc),
you can test by accessing /Shibboleth.sso/Session
after going a
/Shibboleth.sso/Login
cycle and it'll list various details, or state:
A valid session was not found
if it didn't work or you haven't logged in yet.