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。