private string GetAuthenticationHeaderForRequest(Uri requestUri, HttpMethod method)
        {
            List <KeyValuePair <string, string> > parameters = new List <KeyValuePair <string, string> >()
            {
                new KeyValuePair <string, string>(Constants.oauth_consumer_key, _apiKey),
                new KeyValuePair <string, string>(Constants.oauth_nonce, OAuthHelpers.GenerateNonce()),
                new KeyValuePair <string, string>(Constants.oauth_timestamp, OAuthHelpers.GenerateTimestamp()),
                new KeyValuePair <string, string>(Constants.oauth_signature_method, "HMAC-SHA1"),
                new KeyValuePair <string, string>(Constants.oauth_version, Constants.oauth_version_1a),
                new KeyValuePair <string, string>(Constants.oauth_token, _authToken),
            };

            string baseUri = requestUri.OriginalString;

            // We need to handle the case where the request comes with query parameters
            if (!string.IsNullOrEmpty(requestUri.Query))
            {
                baseUri = requestUri.OriginalString.Replace(requestUri.Query, "");

                foreach (var param in requestUri.Query.Split(new char[] { '?', '&' }, StringSplitOptions.RemoveEmptyEntries))
                {
                    var    values = param.Split('=');
                    string name   = values[0];
                    string value  = string.Empty;
                    if (values.Length > 1)
                    {
                        value = values[1];
                    }
                    parameters.Add(new KeyValuePair <string, string>(name, value));
                }
            }

            string baseString = OAuthHelpers.GenerateBaseString(baseUri, method.ToString(), parameters);

            Trace.WriteLine($"Base String: {baseString}");
            string sig = OAuthHelpers.EncodeValue(OAuthHelpers.GenerateHMACDigest(baseString, _secret, _authTokenSecret));

            parameters.Add(new KeyValuePair <string, string>(Constants.oauth_signature, sig));

            StringBuilder sb = new StringBuilder();

            foreach (var param in parameters)
            {
                if (param.Key.StartsWith("oauth"))
                {
                    sb.AppendFormat("{0}={1},", param.Key, System.Net.WebUtility.HtmlEncode(param.Value));
                }
            }
            sb.Remove(sb.Length - 1, 1);
            return(sb.ToString());
        }