In https://matrix.squiz.net/manuals/keyword-replacements/chapters/global-keywords the manual says:
A PHP server variable where <variable> is the PHP session variable that you want to return server information from (ref: PHP $_SERVER Manual).
For example, the global keyword replacement
%globals_server_http_user_agent%will return the header of the current request (e.g. Mozilla/4.5 [en] (X11; U;Linux 2.2.9 i586 ) ). Please note that the server information available will vary depending on the setup of your web server.
We have a couple of variables populated by the HTTP authentication method we use locally (Shibboleth with ADFS as an IDP) - and I can’t get them to display through use of globals_server_ keywords.
Is there a list somewhere that anyone has? Is there a script in particular I should look at?