Netflix/feign — pull request #12 by adriancole (2013-07-07 15:10:40+00:00)
Title: decouple fallback from error handling

fallback handling is differs between sync and observer responses; decouple from error handling.

In an observer, there is no return type, rather a series of `onNext()` calls. Conflating exception decoding with fallback makes it impossible to reliably reuse the ErrorDecoder class across both usage scenarios.