使用MS Cognitive Services图像分析演示代码的错误404

Question

使用https://docs.microsoft.com/zh-cn/azure/cognitive-services/computer-vision/quickstarts/csharp上的MS Cognitive Services示例应用程序中 的代码，尝试运行以下代码时出现错误404 imageFilePath设置本地JPEG文件：static async void MakeAnalysisRequest(string imageFilePath)    {        HttpClient client = new HttpClient();        // Request headers.        client.DefaultRequestHeaders.Add("Ocp-Apim-Subscription-Key", subscriptionKey);        // Request parameters. A third optional parameter is "details".        string requestParameters = "visualFeatures=Description&language=en";        // Assemble the URI for the REST API Call.        string uri = uriBase + "?" + requestParameters;        HttpResponseMessage response;        // Request body. Posts a locally stored JPEG image.        byte[] byteData = GetImageAsByteArray(imageFilePath);        using (ByteArrayContent content = new ByteArrayContent(byteData))        {            // This example uses content type "application/octet-stream".            // The other content types you can use are "application/json" and "multipart/form-data".            content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");            // Execute the REST API call.            response = await client.PostAsync(uri, content);            // Get the JSON response.            string contentString = await response.Content.ReadAsStringAsync();            // Display the JSON response.            Console.WriteLine("\nResponse:\n");            Console.WriteLine(JsonPrettyPrint(contentString));        }subscriptionKey是我的Azure订阅提供的两个密钥中的KEY1（在澳大利亚东部位置），而uribase是const string uriBase = "https://australiaeast.api.cognitive.microsoft.com/vision/v1.0";KEY1和uriBase的组合可与位于以下位置的API演示一起正常使用https://australiaeast.dev.cognitive.microsoft.com/docs/services/56f91f2d778daf23d8ec6739/operations/56f91f2e778daf14a499e1fa/console当目标文件是URL而不是本地文件时。图像已正确分析。