Function accept_async 

pub async fn accept_async<S>(stream: S) -> Result<WebSocketStream<S>, Error>
where
    S: AsyncRead + AsyncWrite,

Available on crate feature ws only.

Accepts a new WebSocket connection with the provided stream.

This function will internally create a handshake representation and returns a future representing the resolution of the WebSocket handshake. The returned future will resolve to either WebSocketStream<S> or WsError depending on if it’s successful or not.

This is typically used after a socket has been accepted from a TcpListener. That socket is then passed to this function to perform the server half of accepting a client’s websocket connection.