https://mail.my.tld/nextcloud

new nextcloud is inside a docker container and behind HAproxy (SSL/TLS offloading)

https://cloud.my.tld

The old links should stay valid ... for example calendar links like:

https://mail.my.tld/nextcloud/remote.php/dav/calendars/stefan@my.tld/pers%c3%b6nlich/

should be kept working while also this should work:

https://cloud.my.tld/remote.php/dav/calendars/stefan@my.tld/pers%c3%b6nlich/

Should/could that be solved on the level of HAproxy or should I better write some Rewrite-statements in the target apache?

I assume there are multiple ways to solve that, and I wonder if someone could help me to find the most elegant and reliable solution.