Add WebSocketUpgrade::selected_protocol
#3248
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Motivation
This allows you to check the subprotocol before spawning the websocket task, letting you e.g. bail out with a
4XXif no subprotocol was provided.Solution
Add a
WebSocketUpgrade::selected_protocol(&self) -> Option<&HeaderValue>function, so you can access the same value asWebSocket::protocol()without yet callingon_upgrade.