Twitter API:401 on POST，GET工作正常

我已经搜索了几天，高低，无法让 POST 到 Twitter API 正常工作。我能够成功获取请求令牌并将其交换为访问令牌，但是当我对状态/更新进行 POST 时，我收到 401 错误。

我已经验证了标题的授权部分与我在使用 Twitter OAuth 工具时收到的内容完全匹配。

我相信我的问题是我将状态添加到 Web 请求正文的方式。网址是只需要 https://api.twitter.com/1/statuses/update.json，还是应该 https://api.twitter.com/1/statuses/update.json?status=MyTweetHere？

我的代码如下：

        public string UpdateStatus(string requestMethod, string baseUrl, string consumerKey, string consumerSecret, string accessToken, OAuthRequestType requestType, string status)
    {
        //baseUrl = https://api.twitter.com/1/statuses/update.json
        const string signatureMethod = "HMAC-SHA1";
        const string oauthVersion = "1.0";
        var timeSpan = (DateTime.UtcNow - new DateTime(1970, 1, 1));
        var timestamp =  (int)timeSpan.TotalSeconds;
        var nonce = CreateNOnce(timestamp, consumerKey, baseUrl, accessToken);
        var signature = CreateSignature(requestMethod, baseUrl, consumerKey, consumerSecret, nonce, signatureMethod, timestamp, accessToken, oauthVersion, string.Empty, string.Empty, requestType, status);
        var bodyData = "status=" + UrlEncode(status);
        var webRequest = (HttpWebRequest)WebRequest.Create(baseUrl);
        webRequest.KeepAlive = true;
        webRequest.ServicePoint.Expect100Continue = false;
        webRequest.Method = requestMethod; //Send in as POST
        webRequest.Accept = "*/*";
        webRequest.UserAgent = "Renicorp.Social";
        webRequest.Headers["Authorization"] = "OAuth " + UrlEncode("oauth_consumer_key") + "='"" + UrlEncode(consumerKey) + "'", " +
                                                         UrlEncode("oauth_nonce") + "='"" + UrlEncode(nonce) + "'", " +
                                                         UrlEncode("oauth_signature") + "='"" + UrlEncode(signature) + "'", " +
                                                         UrlEncode("oauth_signature_method") + "='"" + UrlEncode(signatureMethod) + "'", " +
                                                         UrlEncode("oauth_timestamp") + "='"" + UrlEncode(timestamp.ToString()) + "'", " +
                                                         UrlEncode("oauth_token") + "='"" + UrlEncode(accessToken) + "'", " +
                                                         UrlEncode("oauth_version") + "='"" + UrlEncode(oauthVersion) + "'"";
        string postData = bodyData;
        byte[] byteArray = Encoding.UTF8.GetBytes(postData);
        webRequest.ContentType = "application/x-www-form-urlencoded";
        webRequest.ContentLength = byteArray.Length;
        using (Stream dataStream = webRequest.GetRequestStream())
        {
            dataStream.Write(byteArray, 0, byteArray.Length);
        }
        //Make the web call and return the response
        WebResponse response = webRequest.GetResponse();
        var responseBody = string.Empty;
        Stream stream = response.GetResponseStream();
        if (stream != null) responseBody = new StreamReader(stream).ReadToEnd();
        return responseBody;
    }

更新：我现在编写了一个方法来对 account/verify_credentials.json 执行 GET，并且如果我使用我的应用程序帐户密钥，则能够验证帐户凭据，但是当我尝试使用单独的帐户并提供访问令牌时，我得到 401。