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WebSocket is a protocol that, unlike HTTP, allows for constant two-way communication between client and server. In order for another client to see any updates, it must make a request and receive this data. Spring has many starters in a variety of colors and sizes. We are interested in sockets, so let's add the appropriate starter for sockets. Spring will be a regular map, where the client is a map of sessions (browser sessions) and the user's value is a listing of all open sessions.
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