'The FQPN of a WSGI application object to serve as the root resource of
the webserver.'

def opt_wsgi(self, name):

    try:
        application = reflect.namedAny(name)
    except (AttributeError, ValueError):
        raise usage.UsageError(('No    such    WSGI    application:    %r' % (name,)))
    pool = threadpool.ThreadPool()
    reactor.callWhenRunning(pool.start)
    reactor.addSystemEventTrigger('after', 'shutdown', pool.stop)
    self['root'] = wsgi.WSGIResource(reactor, pool, application)
