Chaining haproxy: tcp-request connect expect-proxy

Could not make expect-proxy here to work
(instead of accept-proxy option and connection accept linehaproxy).
haproxy-1.8 atm.

Thanks,
Gerardo

frontend http-pp
        bind    *:8080 accept-proxy
        maxconn 10000

        acl lb src xx.xx.xx.xx
        acl lb src xx.xx.xx.xx
        tcp-request connection accept if lb
#       tcp-request connection expect-proxy layer4 if lb
        tcp-request connection reject