Filter chain configuration

This is a request not a bug.

The docs and/or examples would benefit if they had a discussion of configuring a filter chain that ONLY accepts the CAS authentication method when other authentication methods exist and are covering other endpoints. Yes, there is plenty of documentation in Spring Security about filter chains, but it remains a confusing subject that is very difficult to research.

Start by reviewing the existing Spring Security filter-chain documentation and examples, focusing on how multiple chains cover different endpoints and authentication methods. Document or illustrate a CAS-only chain alongside those other chains; done means a newcomer can understand where the CAS chain applies and how to configure it.

Written by the indexing model from the issue text.