http:
  middlewares:
    force-trailing-slash:
      chain:
        middlewares:
          - add-trailing-slash
          - strip-after-slash
    add-trailing-slash:
      redirectregex:
        regex: "^(https?://[^/]+/[a-z0-9_]+)$"
        replacement: "${1}/"
        permanent: true
    strip-after-slash:
      stripprefixregex:
        regex: "/[a-z0-9_]+"