Proxy Protocol trouble with haproxy and traefik

Traefik Traefik v1
3

Seems like haproxy when set with config below is working for proxy protocol v1, and the original config for traefik mention in original post above.

backend https-backend
  mode tcp
  balance roundrobin
    server worker1 10.0.30.16:30443 check send-proxy
    server worker2 10.0.30.19:30443 check send-proxy
    server worker3 10.0.30.23:30443 check send-proxy

when adding send-proxy-v2 to the haproxy config, Firefox replies with error PR_END_OF_FILE_ERROR.

Does traefik v1.7 support version 2 of proxy protocol?