Riot-web and nginx -> "Bad request"

My Riot-web runs in a Docker. ( https://hub.docker.com/r/vectorim/riot-web/builds )

Riot-web1.5.8 runs well.
If I upgrade (docker-compose up -d) to 1.5.14 or 1.5.15, the nginx which point to 8080 of the Riot-web-Docker gives back an “Bad request”. Any ideas?