Mounting WSGI Applications as TG Controllers
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WSGI Apps As Controllers
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TurboGears 2 also exposes a WSGI controller, which is a thin and
extensible wrapper to easily mount WSGI apps.

It exposes 3 methods ``__init__``, ``default`` and ``delegate``. From
those 99% of the time you will only need to modify ``__init__`` and/or
``delegate``.

The normal usage is to extend this class with your own, use
``__init__`` to build your app and store it in `self.app` then
overwrite ``delegate`` if you need to modify the environment, the
response or any other mangling.

For an extensive list of examples please see tgext.wsgiapps.