That looks amazingly like the code for CherryPy Filters circa 2005. In
version 2 of CherryPy, "Filters" were the canonical extension method
(for the framework, not WSGI, but the same lessons apply). It was still
expensive in terms of stack allocation overhead, because you had to
call () each fi
Alice Bevan–McGregor
> There's one issue I've seen repeated a lot in working with WSGI1 and
> that is the use of middleware to process incoming data, but not
> outgoing, and vice-versa; middleware which filters the output in some
> way, but cares not about the input.
>
> Wrapping middleware around
