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我有一个 Azure 机器人，它能够获取 wav 音频文件并使用 Bing Speech API 翻译成文本。我正在尝试将其连接到 Skype。我不知道如何从附件中获取流。我的代码的第一部分找到了 ContentType='audio' ok 的 Skype 附件：

    public async Task<string> GetText(IMessageActivity messageActivity)
    {
        var connector = new ConnectorClient(new Uri(messageActivity.ServiceUrl));
        try
        {
            var skypeAudioAttachment = messageActivity.Attachments?.FirstOrDefault(sa => sa.ContentType.Equals("audio"));
            if (skypeAudioAttachment != null)
            {
                var stream = await GetAudioStream(connector, skypeAudioAttachment);

但后来我尝试使用下面的代码（取自 Microsoft BotBuilder 示例的 Controller\MessagesController.cs 文件：https ://github.com/Microsoft/BotBuilder-Samples/tree/master/CSharp/intelligence- SpeechToText）来获得一个流：

    private static async Task<Stream> GetAudioStream(ConnectorClient connector, Attachment audioAttachment)
    {
        using (var httpClient = new HttpClient())
        {
            // The Skype attachment URLs are secured by JwtToken,
            // you should set the JwtToken of your bot as the authorization header for the GET request your bot initiates to fetch the image.
            // https://github.com/Microsoft/BotBuilder/issues/662
            var uri = new Uri(audioAttachment.ContentUrl);
            if (uri.Host.EndsWith("skype.com") && uri.Scheme == "https")
            {
                httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", await GetTokenAsync(connector));
                httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/octet-stream"));
            }

            return await httpClient.GetStreamAsync(uri);
        }
    }

    private static async Task<string> GetTokenAsync(ConnectorClient connector)
    {
        var credentials = connector.Credentials as MicrosoftAppCredentials;
        if (credentials != null)
        {
            return await credentials.GetTokenAsync();
        }

        return null;
    }

这失败了，我想是因为我无法访问该网址。有没有人举例说明如何获取 Skype 音频流或知道我应该怎么做？

ContentUrl 的格式为：https://smba.trafficmanager.net/apis/v3/attachments/LONG_ID_GOES_HERE/views/original。我从 httpClient.GetStreamAsync 请求返回的错误是“响应状态代码不指示成功：401（未授权）。”

谢谢

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