The spec says "Regardless of how it is accomplished, the application
object must always return an iterable yielding zero or more strings."
The "must" means that anything else should be considered an error (I
think). If your middleware does anything to the iterated strings, then
you'll have
I was reading the wsgi spec and i was wondering how should
middleware treat the iterable that happens to contain values
that aren't strings (and I'm not talking about unicodes) - the spec isn't
explicit on this.
If middleware would just pass on values that aren't string
instances - this could be a
