Describe the bug
It is not possible to use the deduperesponseheader filter when using yaml-based configuration of routes, because the @Shortcut annotation is missing.

Sample

filters:
  - DedupeResponseHeader=Access-Control-Allow-Credentials Access-Control-Allow-Origin

Does not work.

filters:
  - DedupeResponseHeader=Access-Control-Allow-Credentials Access-Control-Allow-Origin, RETAIN_FIRST

Does work.

I've also added a PR to solve the issue.