如何在c#net中使用siteminder令牌获取cognos报告

我正在尝试使用siteminder令牌获取cognos报告，下面是我的代码

string cognosUrl = "https://cognos.blah.com";

string reportPath = "/c10/cgi-bin/cognosisapi.dll/rds/reportData/report/";                   string reportId = "ildjfsldkf"; //prod
cognosUrl += string.Concat(reportPath, reportId,"?blahblah");
string targetUrl = cognosUrl;
string strFormvalues = string.Concat("TARGET=",targetUrl);
ASCIIEncoding encoder = new ASCIIEncoding();
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(targetUrl);
byte[] data = encoder.GetBytes(strFormvalues);
request.AllowAutoRedirect = false;
request.Timeout = 120000;
request.ContentLength = data.Length;
request.ContentType = "text/xml;charset=\"utf-8\"";
request.Method = "POST";
request.Headers.Add(HttpRequestHeader.Cookie,"SMSESSION="+stoken);
request.GetRequestStream().Write(data, 0, data.Length);
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Stream dataStream = response.GetResponseStream();
StreamReader reader = new StreamReader(dataStream);
string json = reader.ReadToEnd();
byte[] byteArray = Encoding.UTF8.GetBytes(json);
MemoryStream restream = new MemoryStream(byteArray);
using (Stream output = File.OpenWrite(@"c:\\Projects\\Test_"+DateTime.Now.ToString("yyyyMMddHHmmssfff")+".txt"))
                using (Stream input = restream)
                {
                    if (input != null) input.CopyTo(output);
                }
                // var results = serializer.DeserializeObject(json);
                reader.Close();
                dataStream.Close();
                response.Close();

但我得到的回应是“DPR-ERR-2101您的请求无效。请与管理员联系。”

我自己并没有使用C，但在调试时有一些建议：

• 如果您只是发布一个URL，为什么不使用GET而不是POST呢
• 尝试在浏览器中粘贴targetURL，看看会发生什么
• 在我的设置中，当我在浏览器中粘贴URL时，我总是在收到答复之前被重定向。（对于像/cgi-bin/cognosisapi.dll/rds/sessionOutput/conversationID/i292ED29A62474697AD44306A388F5BBB这样的URL，您正在阻止这种情况发生，这可能是一个问题）

希望有帮助