Error 401 when trying to call the Twitter stream API

Question

I am at my end with this, I reviewed everything here, and when they asked me questions similar to mine, I can’t find this exact one with any answers.

I have been trying to call https://stream.twitter.com/1.1/statuses/filter.json from a C # console application for several days and continue to receive 401 Unauthorized error, which does not matter what I do, will not disappear. Works great for anything that isn't streaming.

const string streamUrl = "https://stream.twitter.com/1.1/statuses/filter.json"; const string oauth_token = "XXX-XXXXX"; const string oauth_token_secret = "XXXXXXXXXXXX"; const string oauth_consumer_key = "XXXXXXXXXXXXX"; const string oauth_consumer_secret = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"; // oauth implementation details const string oauth_version = "1.0a"; const string 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 const string baseFormat = "oauth_consumer_key={0}&oauth_nonce={1}&oauth_signature_method={2}" + "&oauth_timestamp={3}&oauth_token={4}&oauth_version={5}&track=twitter"; var baseString = string.Format(baseFormat, oauth_consumer_key, oauth_nonce, oauth_signature_method, oauth_timestamp, oauth_token, oauth_version); string oauth_signature; var compositeKey = string.Concat(Uri.EscapeDataString(oauth_consumer_secret), "&", Uri.EscapeDataString(oauth_token_secret)); using (var hasher = new HMACSHA1(Encoding.ASCII.GetBytes(compositeKey))) { oauth_signature = Convert.ToBase64String(hasher.ComputeHash(Encoding.ASCII.GetBytes(baseString))); } // create the request header const string headerFormat = "OAuth oauth_consumer_key=\"{0}\", oauth_nonce=\"{1}\", " + "oauth_signature=\"{2}\", oauth_signature_method=\"{3}\", " + "oauth_timestamp=\"{4}\", oauth_token=\"{5}\", " + "oauth_version=\"{6}\""; var authHeader = string.Format(headerFormat, Uri.EscapeDataString(oauth_consumer_key), Uri.EscapeDataString(oauth_nonce), Uri.EscapeDataString(oauth_signature), Uri.EscapeDataString(oauth_signature_method), Uri.EscapeDataString(oauth_timestamp), Uri.EscapeDataString(oauth_token), Uri.EscapeDataString(oauth_version)); const string postparameters = "track=twitter"; streamUrl = string.Format("{0}?{1}", streamUrl, postparameters); while (true) { var timeLineRequest = (HttpWebRequest)WebRequest.Create(streamUrl); timeLineRequest.Headers.Add("Authorization", authHeader); var encode = System.Text.Encoding.GetEncoding("utf-8"); ServicePointManager.Expect100Continue = false; if (postparameters.Length > 0) { timeLineRequest.Method = "POST"; timeLineRequest.ContentType = "application/x-www-form-urlencoded;charset=UTF-8"; byte[] _twitterTrack = encode.GetBytes(postparameters); timeLineRequest.ContentLength = _twitterTrack.Length; Stream _twitterPost = timeLineRequest.GetRequestStream(); _twitterPost.Write(_twitterTrack, 0, _twitterTrack.Length); _twitterPost.Close(); } var webResponse = (HttpWebResponse)timeLineRequest.GetResponse(); var responseStream = new StreamReader(webResponse.GetResponseStream(), encode); while (true) { var jsonText = responseStream.ReadLine(); //Success int wait = 250; //Write Status var status = string.Empty; var json = new DataContractJsonSerializer(status.GetType()); byte[] byteArray = Encoding.UTF8.GetBytes(jsonText); var stream = new MemoryStream(byteArray); status = json.ReadObject(stream) as string; Console.Beep(); Console.WriteLine(status); } } 

I would really appreciate if anyone else overcomes this obstacle. I'm tired of cursing this.

Answer 1

You did not include the HTTP method or base URL in your base line before calculating the signature. This is taken from the Twitter site :

Create a signature baseline

The three values ​​collected so far must be combined to create one line from which the signature will be generated. This is called the signature base string using the OAuth specification.

To encode the HTTP method, the base URL and the parameter string into one line:

• Convert the HTTP method to uppercase and set the output string to this value.

• Add the '&' character to the output string.

• Percent encodes the URL and adds it to the output string.

• Add the '&' character to the output string.

• Percentage encodes the parameter string and adds it to the output string.