Function client_async_tls 

pub async fn client_async_tls<R, S>(
    request: R,
    stream: PollFd<S>,
) -> Result<(WebSocketStream<S>, Response<Option<Vec<u8>>>), Error>
where
    R: IntoClientRequest,
    S: AsFd + 'static,

Available on crate feature ws only.

Creates a WebSocket handshake from a request and a stream, upgrading the stream to TLS if required.