'Dispatch the request to the appropriate controller.
Called by self._router after matching the incoming request to a route
and putting the information into req.environ.  Either returns 404
or the routed WSGI app\'s response.'

@staticmethod
@webob.dec.wsgify(RequestClass=Request)
def _dispatch(req):

    match = req.environ['wsgiorg.routing_args'][1]
    if (not match):
        return webob.exc.HTTPNotFound()
    app = match['controller']
    return app
