Redirect to different app?

[John Moore]

Before I press on much further with the applications I'm working on, I 
thought I'd just sound people out here as to whether there is some 
fundamental flaw in the way I'm planning to use Shiro. The normal way 
Shiro works is that when a user goes to a certain URL, a check is made 
to see whether the user is logged in, etc., and if not, they are 
redirected to a login page.

My tweak on this is that I actually have multiple web applications - a 
central admin app, where user authentication etc. is handled, plus a 
bunch of product-specific applications. I have got session clustering 
working via Redis, so sessions will be shared across the various 
applications. The plan is that when a user goes to a URL in one of the 
product-specific apps, if they are found not to be logged in (via 
session sharing) they will be redirected to the admin app, where they 
will log in and then be redirected back to the original URL. My 
assumption behind this is that I should be able to specify an absolute 
login URL instead of a relative one and as far as the browser and Shiro 
is concerned, this should make no difference (although I wonder how it 
would handle the redirect back to the original URL as an absolute one?). 
I imagine a bit of URL rewriting will be necessary, which will be 
straightforward enough as the requests will probably all be going 
through a reverse proxy server.

Have I misunderstood something fundamental, or does this sound as if it 
should work?