At OpDemand we're using WebSockets successfully through multiple ELBs. The trick is setting the listener to use TCP instead of HTTP. With TCP forwarding you lose X-Forwarded-For headers, Cookie stickiness and a few other HTTP-specific features.. but you can always spin up a separate listener for that.
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They also need websockets support over ELBs.
At OpDemand we're using WebSockets successfully through multiple ELBs. The trick is setting the listener to use TCP instead of HTTP. With TCP forwarding you lose X-Forwarded-For headers, Cookie stickiness and a few other HTTP-specific features.. but you can always spin up a separate listener for that.