Hi Antonio,
we are setting up the integration with SPID.
Basically, when our login URL is called, Nginx works as a reverse proxy to Apache, which then invokes Shibboleth. After the authentication process, Shibboleth should create the headers with the user information, but at the moment we are not able to receive them on the application side.
So we are trying to understand where the headers are getting lost between Apache, Nginx and Naviserver/OpenACS.
Thanks.