Initial implementation of subprotocol negotation #3
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Here is a simple implementation of sub-protocol negotiation as defined in the RFC 6455 section 1.9. It does not implement any particular protocol but merely provides a hook function, register_protocol, so that you can register a subprotocol name for negotiation when a client connects. If the client and server agree on a subprotocol, then the wsgi environ variable 'wsgi.websocket_protocol' is set with the name of the subprotocol that was agreed upon. I am working on a WAMP implementation that I will publish separately that uses this mechanism.