haproxy 1.5dev7 server check failed with IPv6

[Delta Yeh]

Hi,
   It seems haproxy failed to do server check with IPv6.
  The top is like:
   browser---haproxy-----www server

I did the following tests:
 1. IPv4 http server with server check, it works
 2. IPv6 http server with server check,  I get http 503. After disable
server check, I get http 200.
 3. IPv4 and IPv6 server with server check, only see IPv4 check packet.
      I get 503 when access WWW with IPv6. I get 200 when access WWW
server with IPv4.


BR,
DeltaY