ServeWs handles websocket requests from the peer.

BroadcastMessage represents a broadcast message sent over the websocket to all clients including the tag cloud as html and the cloud id.

Client is a middleman between the websocket connection and the hub.

Hub maintains the set of active clients and broadcasts messages to the clients.

Message represents a message sent over the websocket for a new tag.

ResponseBuffer is a buffer that implements http.ResponseWriter.