Adding extra parameters to GET statuses/home_timeline get an unauthorized error


#1

.I’m new to the Twitter API.

I’ve got the basic home_timeline API call working, but now I want to add some extra parameters, but when I do so I get error “The remote server returned an error: (401) Unauthorized.”

The extra parameters I want to add are:
exclude_replies=true&count=200&trim_user=true

Here is my code:

public string query = “19Averil”;
public string url = “https://api.twitter.com/1.1/statuses/user_timeline.json”;

   protected void Page_Load(object sender, EventArgs e)
    {
        findUserTwitter(url, query);
    }

    public void findUserTwitter(string resource_url, string q)
    {

        var authHeader = PrepareAuthHeader(resource_url, q);

        ServicePointManager.Expect100Continue = false;

        // make the request
        var postBody = "exclude_replies=true&count=200&trim_user=true&screen_name=" + Uri.EscapeDataString(q); //
        resource_url += "?" + postBody;
        HttpWebRequest request = (HttpWebRequest) WebRequest.Create(resource_url);
        request.Headers.Add("Authorization", authHeader);
        request.Method = "GET";
        request.ContentType = "application/x-www-form-urlencoded";
        var response = (HttpWebResponse) request.GetResponse();
        var reader = new StreamReader(response.GetResponseStream());
        var objText = reader.ReadToEnd();
        myDiv.InnerHtml = objText; /**/
        string html = "";
        try
        {
            JArray jsonDat = JArray.Parse(objText);
            for (int x = 0; x < jsonDat.Count(); x++)
            {
                   html += jsonDat[x]["text"].ToString() + "<br/>";
            }
            myDiv.InnerHtml = html;
        }
        catch (Exception twit_error)
        {
            myDiv.InnerHtml = html + twit_error.ToString();
        }
    }

    private static string PrepareAuthHeader(string resource_url, string q)
    {
        // oauth application keys
        var oauth_token = //"insert here...";
        var oauth_token_secret =  //"insert here...";
        var oauth_consumer_key = // = "insert here...";
        var oauth_consumer_secret = // = "insert here...";

        // 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}&exclude_replies=true&count=200&trim_user=true&screen_name={6}";

        var baseString = string.Format(baseFormat,
            oauth_consumer_key,
            oauth_nonce,
            oauth_signature_method,
            oauth_timestamp,
            oauth_token,
            oauth_version,
            Uri.EscapeDataString(q)
            );

        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)
            );
        return authHeader;
    }