Comment 2 for bug 1915119

I think this is not a Tacker issue, but a keystonemiddlware issue.
The error you mentioned is raised from the process_request method of keystonemiddlware.

https://github.com/openstack/keystonemiddleware/blob/90df936708aee36d77cead548d04cb7db2327f47/keystonemiddleware/auth_token/__init__.py#L680-L686

So, it's difficult to fix it unless changing the authentication flow of Tacker.