'What is Bean Filter0?

This page in the Spring Security Reference, talks about Bean Filter0? After reading the JavaDocs, I was wondering what is this Filter0? Where is it configured?

DelegatingFilterProxy looks up Bean Filter0 from the ApplicationContext and then invokes Bean Filter0.

And on a side note, how to print all the filters being used in an invocation, not just the Spring Security filters? I'm using Spring Boot 5.x.x.



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