Description
Currently the marshaller works off the return type of the action method. We likely want to allow interceptors to override this and return other response bodies without requiring that the implement their own marshalling. For example, when handling an exception, we may want to allow the exception mapping interceptor to return a structured response body in JSON format. Similarly other interceptors might short-circuit the dispatch chain and want to return a customized response (e.g. an authentication interceptor that returns a redirect + structured response about how to authenticate). These should be possible without requiring the interceptors to write their own custom ResponseBody - they should be able to rely on the marshalling framework to do the content negotiation and object to ResponseBody conversion for them.