frontend web
    bind *:80
    reqadd X-Forwarded-Proto:\ http if !{ ssl_fc }
    reqadd X-Forwarded-Proto:\ https if { ssl_fc }

    default_backend myapp_ui
...
    acl is_kibana path_sub logs
    acl is_kibana path_sub kibana
    acl is_kibana path_sub bundles
    acl is_kibana path_sub app/kibana
    acl is_kibana path_sub plugins/kibana/assets

    use_backend kibana if is_kibana
    use_backend es_head if is_es_head
...

backend myapp_ui
    server ui1 myapp:8080 check

backend kibana
    mode http
    reqrep ^([^\ ]*\ /)logs[/]?(.*)     \1\2
    reqrep ^([^\ ]*\ /)kibana[/]?(.*)     \1\2
    server kibana kibana:5601 check

And here's an excerpt from my docker-compose.yml file:

  haproxy:
    image: < personal repo >
    restart: always
    links:
      - myapp
      - kibana
      - es_head
    volumes:
      - ./docker/haproxy/haproxy.cfg:/usr/local/etc/haproxy/haproxy.cfg:ro
    ports:
      - "80:80"

  kibana:
    image: < personal repo >
    ports:
      - "5601:5601"