Scrape a GWT Website using HTTPWebRequest in C#

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C#

I want to scrape (Screen Scrape) a website developed using Google Web Toolkit and the page which I am trying to scrape seems to be a flash page.

I use the following code.

HttpWebRequest request   = (HttpWebRequest)HttpWebRequest.Create("https://xxx);
request.Method            = "POST";
request.UserAgent         = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.115 Safari/537.36";
request.Headers["Cookie"] = SessionID;
request.Referer           = "xxx";
request.Accept            = "*/*";

request.Headers["X-GWT-Permutation"] = "E81756AE355F23274CB68B43D62F0248";
request.Headers["X-GWT-Module-Base"] = "https://xxx";

byte[] buffer             = System.Text.Encoding.ASCII.GetBytes(encodeData("7|0|6|https://xxx"));  //);
Stream PostData           = request.GetRequestStream();

PostData.Write(buffer, 0, buffer.Length);
PostData.Close();

HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Stream stream            = response.GetResponseStream();

I get an output throwing an error as below

/EX[2,1,["com.google.gwt.user.client.rpc.IncompatibleRemoteServiceException/3936916533","Parameter 0 of is of an unknown type 'java.lang.String%2F2004016611'"],0,7]