Xibo in sublocation with reverse proxy – update to 4.2 failed

Get Help CMS Features and Functionality
1

OK, my configuration is a bit unusual… but so far it works (almost, since 4.1 the preview doesn’t work anymore, see here)

I use docker with custom ports:

cms-xmr:
        ports:
            - "9505:9505"

    cms-web:
        ports:
            - "127.0.0.1:8081:80"

And in Apache as proxy:

        ProxyPreserveHost On
        RequestHeader set X-Forwarded-Proto expr=%{REQUEST_SCHEME}

        ProxyPass /xibo http://127.0.0.1:8081/xibo
        ProxyPassReverse /xibo http://127.0.0.1:8081/xibo

So far, this configuration has worked. After updating to 4.2.x, I can still access the web frontend and register players (they appear online), but the player (Windows R404) isn’t receiving any content.

In the Proxy-Apache log I found:

 script '/var/www/html/xmds.php' not found or unable to stat

Apparently, the sublocation isn’t being taken into account.

If I restore the backup from 4.1.x, everything works normally again.

I suspect this is a bug, or do I need to change something in my configuration for the new XMR?

Greetings
volker