Android，Okhttp -如何向websocket连接添加子协议

OkHttpClient client = new OkHttpClient();

Request request = new Request.Builder()
        .url("wss://example.com/websocket")
        .addHeader("Sec-WebSocket-Protocol", "subprotocol1")
        .build();

WebSocket webSocket = client.newWebSocket(request, new WebSocketListener() {
    @Override
    public void onOpen(WebSocket webSocket, Response response) {
        // WebSocket连接已打开
    }

    @Override
    public void onMessage(WebSocket webSocket, String text) {
        // 接收到消息
    }

    @Override
    public void onClosed(WebSocket webSocket, int code, String reason) {
        // WebSocket连接已关闭
    }

    @Override
    public void onFailure(WebSocket webSocket, Throwable t, Response response) {
        // 连接失败
    }
});

// 发送消息
webSocket.send("Hello, WebSocket!");