document limitations of OIDCUnAuthzAction
# "302" redirect to the URL specified in the <argument> parameter
# "auth" redirect the user to the OpenID Connect Provider or Discovery page for authentication (<argument> is unused)
# Useful in Location/Directory/Proxy path contexts that need to do stepup authentication
+# Be aware that this will only work in combination with single Require statements, so using
+# RequireAll, RequireAny and multiple Require statements is not supported.
# When not defined the default "403" is used. However Apache 2.4 will change this to 401
# unless you set "AuthzSendForbiddenOnFailure on"
#OIDCUnAutzAction [401|403|302|auth] [<argument>]
