I am running OH2 for month without issues in a Docker container.
Openhab is on port 8060 and not exposed to internet so no rev proxy is in between.
If I am accessing (as usual) http://192.168.100.10:8060 I am receiving this:
Bad Message 431
reason: Request Header Fields Too Large
In openhab log I am finding this:
[WARN ] [org.eclipse.jetty.http.HttpParser ] - Header is too large 8193>8192