multiple post-signup urls

Hello there,

I'm new to spring social and i wanted to test it for my special case.
I have a website project, where there are multiple sites that should support facebook/twitter authentication.

The current problem i'm facing is that the ProviderSignInController has one postSignInUrl, which i can set to a definite endpoint. As i already mentioned i have multiple sites with this kind of authentication in mind.

How can i implement a mechanism for setting the postSignInUrl to a different one each request?

Thanks in advance