HAProxy protocol version 1.5 support (see
http://haproxy.1wt.eu/download/1.5/doc/proxy-protocol.txt) for applications
using io-streams. The proxy protocol allows information about a networked
peer (like remote address and port) to be propagated through a forwarding
proxy that is configured to speak this protocol.

Homepage:
http://hackage.haskell.org/package/io-streams-haproxy
