Function client_tls 

pub fn client_tls<R, S>(
    request: R,
    stream: S,
) -> Result<(WebSocket<MaybeTlsStream<S>>, Response), HandshakeError<ClientHandshake<MaybeTlsStream<S>>>>
where
    R: IntoClientRequest,
    S: Read + Write,

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