'Render a page with a 404 return code and a message.'

def notFound(self):

    fmt = 'The    path    <q>%s</q>    was    not    understood    by    this    server.'
    msg = (fmt % (self.path,))
    openid_url = self.query.get('openid_identifier')
    self.render(msg, 'error', openid_url, status=404)
