带有授权和 JSON 数据的 C# HttpClient Post - 401 未经授权

Question

尝试发送 post 请求（在 postman 中工作正常），但在 C# 中不断收到 401 Unauthorized 异常。这是我的代码：

var httpClient = new HttpClient();
var creds = string.Format("{0}:{1}", "username", "password");
var basicAuth = string.Format("Basic {0}", Convert.ToBase64String(Encoding.UTF8.GetBytes(creds)));
httpClient.DefaultRequestHeaders.Add("Authorization", basicAuth);

var requestMessage = new HttpRequestMessage(HttpMethod.Post, url);
requestMessage.Content = new StringContent(postData, Encoding.UTF8, "application/json");
requestMessage.Headers.Authorization = new AuthenticationHeaderValue("Basic", "encodedValue==");

var post = httpClient.SendAsync(requestMessage);
post.Wait();

使用 HttpWebRequest 时也会发生同样的事情：

var webReq = (HttpWebRequest)WebRequest.Create(url);
webReq.Headers.Add("Authorization","Basic encodedValue==");
webReq.Method = "POST";
webReq.ContentType = "application/json";

try
{
    using (var streamWriter = new StreamWriter(webReq.GetRequestStream()))
    {
        streamWriter.Write(json);
        streamWriter.Flush();
        streamWriter.Close();
    }

    var httpResponse = (HttpWebResponse)webReq.GetResponse();
    using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
    {
        response = streamReader.ReadToEnd();
    }
}

有人知道我可以尝试什么吗？PS（encodedValue==编码正确）

Answer 1

HttpClient 在重定向时会丢失其标头。

因此，请确保您使用正确的 API 地址。如果您的 API 不允许不安全连接，但您使用“ http://your-api-address.xy/ ”而不是“ https://your-api-address.xy/ ”，它将返回重定向，并且您的客户端丢失标题。