Twitter搜索API远程服务器返回错误：（401）未经授权

Question

I have an app trying to make a simple GET call to a Twitter feed, but it;s failing with the error above. I am able to successfully get an access_token before calling the code below.

string lUrl = "https://api.twitter.com/1.1/search/tweets.json&q=" + HttpUtility.UrlEncode("@typescriptlang");
var headerFormat = "Bearer {0}";
var authHeader = string.Format(
  headerFormat,
  Convert.ToBase64String(Encoding.ASCII.GetBytes(HttpUtility.UrlEncode(access_token)))
);
HttpWebRequest lRequest = HttpWebRequest.CreateHttp(lUrl);
lRequest.Method = "GET";
lRequest.Headers.Add("Authorization", authHeader);
WebResponse lResponse = lRequest.GetResponse();

Answer 1

Ok, this is exactly what you need to do, I have tested this and it is a working solution:

        private string oAuthConsumerKey = ConfigurationManager.AppSettings["oAuthConsumerKey"];
        private string oAuthConsumerSecret = ConfigurationManager.AppSettings["oAuthConsumerSecret"];
        private string oAuthUrl = ConfigurationManager.AppSettings["oAuthUrl"];     
        private static string searchFormat = ConfigurationManager.AppSettings["searchFormat"];
        private string searchUrl = string.Format(searchFormat, "%23test");

        public string GetSearch()
        {
            // Do the Authenticate
            var authHeaderFormat = "Basic {0}";

            var authHeader = string.Format(authHeaderFormat,
                                           Convert.ToBase64String(
                                               Encoding.UTF8.GetBytes(Uri.EscapeDataString(oAuthConsumerKey) + ":" +

                                                                      Uri.EscapeDataString((oAuthConsumerSecret)))

                                               ));
            var postBody = "grant_type=client_credentials";
            HttpWebRequest authRequest = (HttpWebRequest)WebRequest.Create(oAuthUrl);

            authRequest.Headers.Add("Authorization", authHeader);
            authRequest.Method = "POST";
            authRequest.ContentType = "application/x-www-form-urlencoded;charset=UTF-8";
            authRequest.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
            using (Stream stream = authRequest.GetRequestStream())
            {
                byte[] content = ASCIIEncoding.ASCII.GetBytes(postBody);
                stream.Write(content, 0, content.Length);
            }
            authRequest.Headers.Add("Accept-Encoding", "gzip");
            WebResponse authResponse = authRequest.GetResponse();
            // deserialize into an object
            TwitAuthenticateResponse twitAuthResponse;
            using (authResponse)
            {
                using (var reader = new StreamReader(authResponse.GetResponseStream()))
                {
                    JavaScriptSerializer js = new JavaScriptSerializer();
                    var objectText = reader.ReadToEnd();
                    twitAuthResponse = JsonConvert.DeserializeObject<TwitAuthenticateResponse>(objectText);
                }
            }

            // Do the timeline
            HttpWebRequest timeLineRequest = (HttpWebRequest)WebRequest.Create(searchUrl);
            var timelineHeaderFormat = "{0} {1}";
            timeLineRequest.Headers.Add("Authorization",
                                        string.Format(timelineHeaderFormat, twitAuthResponse.token_type,
                                                      twitAuthResponse.access_token));
            timeLineRequest.Method = "Get";
            WebResponse timeLineResponse = timeLineRequest.GetResponse();

            var timeLineJson = string.Empty;
            using (timeLineResponse)
            {
                using (var reader = new StreamReader(timeLineResponse.GetResponseStream()))
                {
                    timeLineJson = reader.ReadToEnd();
                }
            }
            return timeLineJson;
        }

You also need to add this to the web or app.config in the appsettings:

<add key="searchFormat" value="https://api.twitter.com/1.1/search/tweets.json?q={0}"/>

I will update my the GitHub project to include this later today at:

https://github.com/andyhutch77/oAuthTwitterTimeline

There will be some code to un-comment to display the search. I might have to re-think the project name now it has searching in it too.

Please note if it does not work you may have issues with the limit on your application at the twitter end. I have also read that some people have problems on shared IP adresses'.