将二进制数据发布到Microsoft face api并返回400错误请求

Question

我已将图像转换为字节数组并尝试通过microsoft face api发布，但我一直收到Http400错误请求。我不确定这个问题是否是由我创建的标头或二进制数据引起的。我确实设法以类似的方式发布图像uri，它工作得很好。

    HttpClient client = new HttpClient();
    client.BaseAddress = new Uri(baseUrl);
    client.DefaultRequestHeaders.TryAddWithoutValidation("content-type", "application/octet-stream");
    client.DefaultRequestHeaders.Add("Ocp-Apim-Subscription-Key", 
                                    "MY-KEY");
    HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, "/face/v1.0/detect");
    request.Content = new ByteArrayContent(bytes);
    HttpResponseMessage response = await client.SendAsync(request);
    return response;

这是请求，由于某种原因，内容类型不存在。有人可以帮忙解释一下吗？感谢

{Method: POST, RequestUri: 'https://eastus2.api.cognitive.microsoft.com/face/v1.0/detect', Version: 2.0, Content: System.Net.Http.ByteArrayContent, Headers:{  Ocp-Apim-Subscription-Key: MY-Key  Content-Length: 141600}}

这是api参考Documentation