werkzeug.wsgi.ClosingIterator

The WSGI specification requires that all middlewares and gateways respect the `close` callback of the iterable returned by the application. Because it is useful to add another close action to a returned iterable and adding a custom iterable is a boring task this class can be used for that:: return ClosingIterator(app(environ, start_response), [cleanup_session, cleanup_locals]) If there is just one close function it can be passed instead of the list. A closing iterator is not needed if the application uses response objects and finishes the processing if the response is started:: try: return response(environ, start_response) finally: cleanup_session() cleanup_locals()