Reverse Proxy – Setting Up FreeIPA Web Interface Behind HAProxy

I am trying to configure the FreeIPA web interface to work behind my HAProxy instance. I found an old GitHub Gist for the configuration (https://gist.github.com/m4ce/d081ab39654c3e13bbe8b150986526a3) as well as a medium article (https://medium.com/@michalmedvecky/running-freeipa-behind-haproxy-77620736698e) but in both cases they make use of the rspirep command, something which is no longer supported in HAProxy. So far I have got this:

        balance roundrobin
        # Set cookie to ensure same server is used
        cookie SERVERID insert indirect nocache httponly secure

        # Modify headers
        http-request set-header Referer https://1.ipa.example.com/ipa

        # Set cookies domain
        acl hdr_set_cookie_dom_1 res.hdr(Set-cookie) -m sub Domain= 1.ipa.example.com
        http-response replace-header  Set-Cookie ^Domain=1\.ipa\.example\.com(.*)$  Domain=authenticate\.example\.com\1 if hdr_set_cookie_dom_1

        server 1.ipa 1.ipa.example.com:443 check ssl verify none cookie 1

But this just results in the client being redirected from authenticate.example.com to 1.ipa.example.com.

Does anyone have a more up to date guide on how to configure this or any ideas on what might be causing the issues?