Thanks, Samer,
I learned that my specific setup relies on a middleware, that I’ve no control of.
For reference if someone runs into the same: I use Truenas-Scale with traefik from the truecharts.org -repo as proxy and opensprinkler is set up there as external-service. Adding tc-opencors-chain as middleware didn’t do the trick and from https://github.com/truecharts/charts/issues/6004 I learned that developers are not willing to make any change there now.
…so I’m quite sure that you can’t help me out of this mess, Samer 🙂
sunny greetings from Portugal,
Gregor