Enhancement
There are some aspects of the Feign.Builder which are currently not customizable out of the box, such as https://github.com/spring-cloud/spring-cloud-openfeign/issues/243.
I want to voice a suggestion that a new interface FeignBuilderCustomizer be added, in the same vein as many Spring Boot *Customizers, that would allow people to arbitary make changes to the Builder before it is used. If any new features are added to OpenFeign but are not yet supported by Spring Cloud OpenFeign this would allow people to workaround those limitations, at least until whatever is lacking is supported in a more direct manor. Or perhaps not for whatever the reason may be, but it would still allows people to implement their own workarounds more easily in that case.