请教， workers 如何中转 WebSocket

我的想法：

async function handleRequest(request) {

    const webSocketPair = new WebSocketPair()
    const [client, server] = Object.values(webSocketPair)
    server.accept()

    const proxy = new WebSocket('wss://abc.com:9443'); // 这个 API 不能用
    proxy.onmessage = msg => {
        client.send(msg);
    }
    server.onmessage = msg => {
        proxy.send(msg);
    }

    return new Response(null, {
        status: 101,
        webSocket: client
    });
}

new WebSocket 抛异常了，怎么办