C#Http连接Bearer头请求

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PostMen连接时用Bearer链接可以
代码中不可以
代码：
HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
request.Headers.Add(HttpRequestHeader.Authorization, "Bearer " + strAuthorization);


是有什么没有设置吗

[qq_39178629]

public string HttpGet(string Url, string postData) { try { string retString = string.Empty; HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url); request.Method = "GET"; request.Headers.Add("Authorization", "Bearer " + postData); request.ContentType = "application/json; charset=utf-8"; HttpWebResponse response = (HttpWebResponse)request.GetResponse(); Stream myResponseStream = response.GetResponseStream(); StreamReader streamReader = new StreamReader(myResponseStream); retString = streamReader.ReadToEnd(); streamReader.Close(); myResponseStream.Close(); return retString; } catch (Exception ex) { throw ex; } }