Trusted Headers SSO
Trusted Headers is a simple header authorization framework supported by Authelia.
This mechanism is supported by proxies which inject certain response headers from Authelia into the protected application. This is a very basic means that allows the target application to identify the user who is logged in to Authelia. This like all single-sign on technologies requires support by the protected application.
You can read more about this in the Trusted Header SSO Integration Guide.