SpringBoot Deprecate spring.mvc.pathmatch.use-suffix-pattern, spring.mvc.pathmatch.use-registered-suffix-pattern, and spring.mvc.contentnegotiation.favor-path-extension

The underlying properties have been deprecated in Spring MVC. We should consider following suit with our configuration properties.

Comment From: ettingshausen

@wilkinsona Excuse me for interrupting. Is there a new recommended usage? For some old applications which use *.do or *.action.

Comment From: snicoll

@ettingshausen the original description states that we're merely deprecating configuration properties that control a behaviour that's now discouraged in the core framework. The reference guide of the Spring Framework has an explicit note about it.

Going forward, please ask questions on StackOverflow, as mentioned in the guidelines for contributing, we prefer to use GitHub issues only for bugs and enhancements.