Given that this filter is explicitly added here (and not specified inside a `@RequestFilters` annotation in the api classes), could you add some unit tests to the [RestAnnotationProcessorTest](https://github.com/maginatics/jclouds/blob/master/core/src/test/java/org/jclouds/rest/internal/RestAnnotationProcessorTest.java) class to make sure filters are properly populated given the different possible values of the property?