The remote server returned an error: (403) Forbidden?

directmessages

#1

When using Twitter APIs to send Direct Message through .NET Web Forms Application it returned to me
The remote server returned an error: (403) Forbidden
Status Code and Description return "Forbidden"
so any help?


#2

That sounds like an authentication issue. What URL are you calling and can you share any example code that reproduces the issue? (please do not post your API keys though).


#3

This is the my Code and when send a Tweet using another function it works Successfully but when using the blew function to send direct message it give me an exception “The remote server returned an error: (401) Unauthorized.”

    public void SendDirectMessage(string ScreenName, string Msg)
    {
    // oauth application keys
    //Using API getting secret in token and token in secret
    var oauth_token = ""; 
    var oauth_token_secret = "";
    var oauth_consumer_key = "";
    var oauth_consumer_secret = "";

    //The Twitter json url to to send direct Message
    string resource_url = "https://api.twitter.com/1.1/direct_messages/new.json";

    // oauth implementation details
    var oauth_version = "1.0";
    var oauth_signature_method = "HMAC-SHA1";

    // unique request details
    var oauth_nonce = Convert.ToBase64String(new ASCIIEncoding().GetBytes(DateTime.Now.Ticks.ToString()));
    var timeSpan = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
    var oauth_timestamp = Convert.ToInt64(timeSpan.TotalSeconds).ToString();

    // create oauth signature
    var baseFormat = "oauth_consumer_key={0}&oauth_nonce={1}&oauth_signature_method={2}" +
                     "&oauth_timestamp={3}&oauth_token={4}&oauth_version={5}&screen_name={6}&text={7}";
    var baseString = string.Format(baseFormat,
                            oauth_consumer_key,
                            oauth_nonce,
                            oauth_signature_method,
                            oauth_timestamp,
                            oauth_token,
                            oauth_version,
                            ScreenName,
                            Uri.EscapeDataString(Msg)
                            );

    baseString = string.Concat("GET&", Uri.EscapeDataString(resource_url), "&", Uri.EscapeDataString(baseString));
    var compositeKey = string.Concat(Uri.EscapeDataString(oauth_consumer_secret), "&", Uri.EscapeDataString(oauth_token_secret));
    string oauth_signature;

    using (HMACSHA1 hasher = new HMACSHA1(ASCIIEncoding.ASCII.GetBytes(compositeKey)))
    {
        oauth_signature = Convert.ToBase64String(hasher.ComputeHash(ASCIIEncoding.ASCII.GetBytes(baseString)));
    }

    // create the request header
    var headerFormat = "OAuth oauth_nonce=\"{0}\", oauth_signature_method=\"{1}\", " +
                       "oauth_timestamp=\"{2}\", oauth_consumer_key=\"{3}\", " +
                       "oauth_token=\"{4}\", oauth_signature=\"{5}\", " +
                       "oauth_version=\"{6}\"";

    var authHeader = string.Format(headerFormat,
                            Uri.EscapeDataString(oauth_nonce),
                            Uri.EscapeDataString(oauth_signature_method),
                            Uri.EscapeDataString(oauth_timestamp),
                            Uri.EscapeDataString(oauth_consumer_key),
                            Uri.EscapeDataString(oauth_token),
                            Uri.EscapeDataString(oauth_signature),
                            Uri.EscapeDataString(oauth_version)
                    );


    ServicePointManager.Expect100Continue = false;

    // make the request
    //var postBody = "?text" + Uri.EscapeDataString(Msg);// +"&result_type=mixed&count=4";// +"&count=100";//
    var postBody = "?text" + Uri.EscapeDataString(Msg) + "&screen_name=" + Uri.EscapeDataString(ScreenName);// +"&result_type=mixed&count=4";// +"&count=100";//
    resource_url += postBody;
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(resource_url);
    request.Headers.Add("Authorization", authHeader);
    request.Method = "POST";
    request.ContentType = "application/x-www-form-urlencoded";

    var response = (HttpWebResponse)request.GetResponse();
    var reader = new StreamReader(response.GetResponseStream());
    var objText = reader.ReadToEnd();

}

#4

I would recommend against writing custom OAuth signature generation code. It’s notoriously difficult to get correct.

Instead you should check out an established API library like twitter4j.


#5

I have already used a library for .NET called tweetSharp but got this exception
{“A connection attempt failed because the connected party did not properly respond after a period of time,
or established connection failed because connected host has failed to respond x.x.x.x:443”}
System.Exception {System.Net.Sockets.SocketException}
So could you help?