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Waitress needs clear error message on no WSGI app #60
If a WSGI application was not passed to waitress, no errors are raised during server start up and only a confusing error message in the output (and nothing useful in the HTTP response). This request improves the error message in the log.
While this may seem unnecessary, it is a very easy beginner mistake to use this init.py code in your Pyramid app:
The result of running the site with the missing return value is an error basically like this:
That is entirely non-debuggable and non-googlable. With my proposed change, you'll see:
I think this is much more helpful.
I originally tried to verify this on server start rather than first request. But so many of the unit tests pass None for app that I decided it wasn't worth the trouble.