Of course, it's not just the transaction middleware affected by this: it's any middleware that has a process_exception() method. Another possibility therefore might be to have Piston itself invoke process_exception() for all installed middlewares before returning the server error response, mimicking:

django/handlers/base.py:97,101

                for middleware_method in self._exception_middleware:
                    response = middleware_method(request, e)
                    if response:
                        return response
                raise

I haven't investigated far enough to figure out if there would be any other problems with doing that.

I do agree there's also an issue with Django too. I'll post a message on django-users to see what the feeling is about it there.

Cheers,
Dan

--
Dan Fairs <dan.fa...@gmail.com> | http://www.fezconsulting.com/