For debugging https://github.com/containous/traefik/issues/2576
docker-compose files: one outdated (Concourse 3.9.0, Traefik 1.5.4), the other updated (Concourse 3.14.0, Traefik 1.6.4). Both appear to work fine and not exhibit the "text/event-stream" network request problem where logs can't be displayed.
# Copy files into a directory. # For this demo, we'll assume `contraef`. # This directory name affects the access URL because docker-compose creates # the stack with this name. You can change it, but watch for reoccurrences. mkdir contraef