'Performs the necessary steps to indicate a WSGI 401
Unauthorized response to the request.
:param env: The WSGI environment for the request.
:param start_response: The WSGI start_response hook.
:returns: 401 response as per WSGI.'

def _invalid(self, env, start_response):

    if (env['REQUEST_METHOD'] == 'HEAD'):
        body = None
    else:
        body = '401    Unauthorized:    Temp    URL    invalid\n'
    return HTTPUnauthorized(body=body)(env, start_response)
