使用令牌与C＃httpclient的身份验证错误

Question

我有一个用于使用REST API的HttpClient。但是，我在设置Authorization标头时遇到了麻烦。我需要将标头设置为从登录方法收到的令牌，但是在其他方法中使用标头时，会出现身份验证错误。

var invoiceObj = new InvoiceUploadObj { dataFile = file, credential = "", domain = "" };
var invoiceObjSerialized = JsonConvert.SerializeObject(invoiceObj);
var data = new StringContent(invoiceObjSerialized, Encoding.UTF8, "application/json");

HttpClient clientDemoWS = new HttpClient();
clientDemoWS.BaseAddress = new Uri("https://www.nameservice.com");
clientDemoWS.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
clientDemoWS.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Authorization", String.Format("Bearer {0}", bearer_token));

HttpResponseMessage responseUpload = clientDemoWS.PostAsync("/services/invoice/upload", data).Result;

状态码为200，但是当我反序列化服务器响应时，会收到身份验证错误作为错误描述。

与Fiddler一起检查，我看到这是标题：

POST /services/invoice/upload HTTP/1.1
Accept: application/json
Authorization: Bearer eyJ0eXAi......
Content-Type: application/json; charset=utf-8
Host: www.nameservice.com
Content-Length: 4623
Expect: 100-continue

我在哪里错了？