I am starting to experiment with websockets.

Does anyone know of a websockets server (open source or paid) that provides a durable store of the websocket "channel"? All of the examples that I have found do not address durability -- if a websockets server goes down, all "channel" data is lost.

Services such as Pusher do not really discuss whether they address the durability issue (and I have not received a response from tech support yet).

Happy to roll my own, but would rather not reinvent the wheel.

EDIT:

I'm not looking for websockets 101 information. That is readily available and understood.

I'm looking for a server (open source or paid) that supports websockets and has a durable store for the websocket data so that, in the event that a server fails, a new server can take over where the original one left off.

Two main purposes: 1. support failover scenarios contemplated by the websockets Network Working Group http://tools.ietf.org/html/draft-ibc-websocket-dns-srv-02#section-5.1 (most importantly so that missed messages are sent when a client connects to a failover server) 2. support scenarios where new subscribers must receive all past messages that were published.

Of course this can be handled at the application layer...but that is not what I am looking for.