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hass-auth-header
Home Assistant custom component, which allows you to delegate authentication to a reverse proxy.
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InfluxDB
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Home Assistant - I used the Header Authentication addon so I can use it with Authelia. Caveat is that I need to create the user in Home Assistant first. This is one reason that Authelia is not necessarily SSO.
I personally use LLDAP, which is a simple LDAP server that apps connect to. Now, authentication is still done in the app itself, but the password is the same everywhere. For apps that don’t support it, I use authelia with header auth.