failed to Login to a remote website - authentication

Question

I spent too much hours to overcome this, till now with no success
From my site which is developed in MVC im trying to send a login request to a remote site, for example, facebook.
From fiddler It seems that the following inputs are required charset_test, lsd, locale,email, pass.
lsd key seems to be the unique token
Here is my code
CookieContainer cookies = new CookieContainer()
private string GetToken()
{
Uri uri = new Uri("http://www.facebook.com");
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(uri);
request.CookieContainer = cookies;
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Stream stream = response.GetResponseStream();
StreamReader reader = new StreamReader(stream);
string htmlText = reader.ReadToEnd();
HtmlDocument document = new HtmlDocument(); --> HtmlAgilePack object
document.LoadHtml(htmlText);
//Need to check xpath doesn't return null object
HtmlNode node = document.DocumentNode.SelectNodes("//input[#name='lsd']").First();
return node.Attributes["Value"].Value;
}
private void Login()
{
string postData = string.Format("charset_test=fixcharset_test&lsd={0} &locale=en_US&email=myemail&pass=mypass", HttpUtility.UrlEncode(GetToken()));
Uri uri = new Uri("http://www.facebook.com/login.php");
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(uri);
request.CookieContainer = cookies;
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = postData.Length;
request.Method = "POST";
request.AllowAutoRedirect = true;
StreamWriter requestWriter = new StreamWriter(request.GetRequestStream());
requestWriter.Write(postData);
requestWriter.Close();
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
}
//After login to facebook suppose to
public string void AddFriend()
{
Uri uri = new Uri("http://www.facebook.com");
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(uri);
request.CookieContainer = cookies;
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
string status = response.StatusDescription;
StreamReader responseReader = new StreamReader(response.GetResponseStream());
string responseData = responseReader.ReadToEnd();
responseReader.Close();
return responseDat
}
Keep in mind, that facebook is just an example, Im aware of its API, Im trying to login to site with no API.
sadly, the response return a facebook page with a sorry message for unrecognizing my browser.
Any help will be more than appreciate.
Thanks,

Answer 1

Are you setting HTTP_USER_AGENT on your request?