javascript - 将音频 blob 的 AJAX 请求发送到异步 API

Question

我正在开发一个遗留系统，我正在尝试调用一个 HTTP 处理程序，我添加了一些从 Azure 服务检索音频 blob 的逻辑。问题是，我似乎无法将内容返回给客户端以便我可以播放它。我从 jQuery 调用得到的响应是:“System.Threading.Tasks.Task`1[System.String]”

这是processRequest代码:

public void ProcessRequest(HttpContext context)
    {
        var text = "walk";
        Authentication auth = new Authentication("subscriptionID");
        context.Response.Write(auth.getVoice(text));
    }

这是 getVoice 函数:

 public async Task<string> getVoice(string text)
    {
        using (var client = new HttpClient())
        {
            try
            {
                client.DefaultRequestHeaders
                    .Add("User-Agent", "uagent");
                client.DefaultRequestHeaders.Add("Ocp-Apim-Subscription-Key", subscriptionKey);
                client.DefaultRequestHeaders.Add("Authorization", "Bearer " + this.token);
                client.DefaultRequestHeaders.Add("host", "westeurope.tts.speech.microsoft.com");
                client.DefaultRequestHeaders.Add("X-MICROSOFT-OutputFormat", "audio-16khz-32kbitrate-mono-mp3");
                UriBuilder uriBuilder = new UriBuilder(VoiceUri);
                // send xml post 
                var voiceTest = "<speak version='1.0' xml:lang='en-US'><voice xml:lang='en-US' xml:gender='Female'\n\rname='Microsoft Server Speech Text to Speech Voice (en-US, ZiraRUS)'>\n\rWalk\n\r</voice></speak>";
                var data = new StringContent(voiceTest, Encoding.UTF8, "application/xml");
                data.Headers.ContentType = new MediaTypeHeaderValue("application/ssml+xml");
                var result = await client.PostAsync(uriBuilder.Uri.AbsoluteUri, data);
                return await result.Content.ReadAsStringAsync();
            }
            catch (Exception e)
            {

                return null;
            }
        }

服务器 API 调用成功，但我似乎无法在客户端接收它以便稍后向用户播放。

Answer 1

您必须解开auth.getVoice的结果。您可以使用 await 关键字来做到这一点。此外，您还需要处理程序来实现 HttpTaskAsyncHandler 类才能使其正常工作

public class TestHandler : HttpTaskAsyncHandler
{
    public async override Task ProcessRequestAsync(HttpContext context)
    {
        var text = "walk";
        Authentication auth = new Authentication("subscriptionID");
        context.Response.Write(await auth.getVoice(text)); //added await here
    }
//..
}