Haproxy basic auth realms

[pfdog]

Here pfSense(v2.1)/Haproxy(v1.8.30) facilitate SSL off-loading to various web servers, some with their own means of authenticating user credentials. The general setup works fine.

However, if just one front end implements basic authentication, then all sites get prompted for the same user credentials, even those front-ends not implementing that protected_realm.

The Haproxy / Settings / Global Advanced pass thru / Custom options:

userlist protected_realm 
user someuser insecure-password somepassword

To prevent that global authentication, is it possible to somehow define un-protected realms as well? For example:

userlist unprotected_realm 
user ALL password NONE

Or is there some other solution?