'Start OpenID verification without doing OpenID server
discovery. This method is used internally by Consumer.begin
after discovery is performed, and exists to provide an
interface for library users needing to perform their own
discovery.
@param service: an OpenID service endpoint descriptor.  This
object and factories for it are found in the
L{openid.consumer.discover} module.
@type service:
L{OpenIDServiceEndpoint<openid.consumer.discover.OpenIDServiceEndpoint>}
@returns: an OpenID authentication request object.
@rtype: L{AuthRequest<openid.consumer.consumer.AuthRequest>}
@See: Openid.consumer.consumer.Consumer.begin
@see: openid.consumer.discover'

def beginWithoutDiscovery(self, service, anonymous=False):

    auth_req = self.consumer.begin(service)
    self.session[self._token_key] = auth_req.endpoint
    try:
        auth_req.setAnonymous(anonymous)
    except ValueError as why:
        raise ProtocolError(str(why))
    return auth_req
