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The `www_authenticate_uri` parameter is used to indicate to clients where they should get a token from in order to authenticate against a service. Most clients are not expected to be able to talk to the internal identity endpoint, so this parameter should refer to the public endpoint instead, see also [0]. [0] https://opendev.org/openstack/keystonemiddleware/src/branch/master/keystonemiddleware/auth_token/_opts.py#L31-L50 Change-Id: Ic99804967b5a62b5a9e39486749474520734ba48