Haproxy and socket.io not working fully

I tried all conceivable haproxy configurations posted on blogs and stackoverflow, but I still can't get haproxy and socket.io to work 100% of the time. In most browsers that "support" network sockets, it fails and returns to a lengthy poll after missing heartbeats. The browser is supposed to make an initial connection (debugging nodejs), but I cannot get clients to receive a response to the connection. Does anyone have similar problems? Below are the software version numbers and some configurations that I have tried.

• haproxy 1.4.18
• node 0.6.5
• socket.io 0.8.7

Haproxy configurations (I tried many more and many options):

• http://engineering.bistri.com/post/14307969768/socket-io-haproxy-http-authentication
• Disabling HAProxy + WebSocket
• http://pastebin.com/H3XNv0TQ
• http://www.darkcoding.net/software/proxy-socket-io-and-nginx-on-the-same-port-over-ssl/ (minus ssl)

Web sockets working in:

• Safari 5 (Windows)
• Chrome 11 (Linux)