500 px api 与 C# 抛出 500 内部服务器错误

Question

我正在尝试用 C# 实现 500px API。我能够使用 500px API 对用户进行身份验证，但我无法获得 access_token 以换取 response_token，这使我的 Oauth 1.0 的第三步不完整。我能够授权用户并获得 oauth_token 和 oauth_verifier 但是当我使用此 oauth_token 提出以下请求时：-

       https://api.500px.com/v1/oauth/access_token

500 Internal Server Error 以及以下屏幕被抛出

我已经调试了我的代码一千次，尝试了不同的方式来形成 URL，向请求中添加了各种参数但没有任何帮助。由于在 500px 开发人员网站或网络上几乎没有任何信息可用于在 C# 中使用此 api，因此我陷入了非常严重的困境。我已经走到了尽头！
以下是我的代码：-

1.]用于请求令牌和授权用户：-

        string normalizedUrl;
        string normalizedRequestParameters;
        OAuth.OAuthBase myOAuth = new OAuth.OAuthBase();
        try
        {
            Uri uri = new Uri("https://api.500px.com/v1/oauth/request_token");
           string  consumerKey = "u26X4av9ydNPd7kteT7bunfcdjHqVttYWIDOC1lA";
           string  consumerSecret = "73iaFPqCR4xkH3dgYIcPauTqhI6tMHWChDivnOP7";
            string timeStamp = myOAuth.GenerateTimeStamp();
            string nonce = myOAuth.GenerateNonce();
            myOAuth.includeVersion = true;
            string signature = myOAuth.GenerateSignature(uri, consumerKey, consumerSecret,
                                    "", "", "GET", timeStamp, nonce, OAuth.OAuthBase.SignatureTypes.HMACSHA1,
                                                 out normalizedUrl, out normalizedRequestParameters);

            string authorizationUrl = normalizedUrl + "?" + normalizedRequestParameters + "&oauth_signature=" + myOAuth.UrlEncode(signature);
                            Uri signInUrl = new Uri(authorizationUrl);



            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(signInUrl);

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();

            StreamReader stIn = new StreamReader(response.GetResponseStream());

            string responseString = stIn.ReadToEnd();

            stIn.Close();

            //oauth_token=cf40227bb7ede4d6e56ff790324761b3&oauth_token_secret=0bcb59dff2c1d095739c86c534fc62d7ed224fecfe8744d48c9c95f36211382f

            if (responseString.Contains("oauth_token=") && responseString.Contains("oauth_token_secret="))
            {
                String RespToken = responseString.Split('&')[0].Replace("oauth_token=", "");
                String RespSecret = responseString.Split('&')[1].Replace("oauth_token_secret=", "");

                uri = new Uri("https://api.500px.com/v1/oauth/authorize");
                timeStamp = myOAuth.GenerateTimeStamp();
                nonce = myOAuth.GenerateNonce();
                myOAuth.includeVersion = true;
                signature = myOAuth.GenerateSignature(uri, consumerKey, consumerSecret, RespToken

                    , RespSecret, "GET", timeStamp, nonce, OAuth.OAuthBase.SignatureTypes.HMACSHA1,

                    out normalizedUrl, out normalizedRequestParameters);
                Console.WriteLine("Signature=="+signature);
                authorizationUrl = normalizedUrl + "?" + normalizedRequestParameters + "&oauth_signature=" + myOAuth.UrlEncode(signature);

                Uri signInUrl1 = new Uri(authorizationUrl);
                webBrowser1.Navigate(signInUrl1);

}

2.]用户点击授权此应用程序获取access_token后：-

     private void webBrowser_Navigated(object sender, WebBrowserNavigatedEventArgs e)
    {
        string parameters;
         string normalizedUrl;
        string normalizedRequestParameters;
        string consumerKey = "u26X4av9ydNPd7kteT7bunfcdjHqVttYWIDOC1lA";
        string consumerSecret = "73iaFPqCR4xkH3dgYIcPauTqhI6tMHWChDivnOP7";
        OAuth.OAuthBase myOAuth = new OAuth.OAuthBase();

         try

        {
           if (e.Url.ToString().Contains("https://www.xyz.com/"))
            {
                String url = (e.Url.ToString()).Replace("https://www.xyz.com/?","");

                if( url.Contains("oauth_token="))
                {
                  string OAuthToken = url.Split('&')[0].Replace("oauth_token=", "");
                  var uri = "https://api.500px.com/v1/oauth/access_token";
                  OAuthBase oAuth = new OAuthBase();
                  var nonce = oAuth.GenerateNonce();
                  var timeStamp = oAuth.GenerateTimeStamp();                
                  var signature = oAuth.GenerateSignature(new Uri(uri), consumerKey, consumerSecret,
                  OAuthToken, String.Empty, "POST", timeStamp, nonce,
                  OAuthBase.SignatureTypes.HMACSHA1, out normalizedUrl, out  normalizedRequestParameters);
                  signature = HttpUtility.UrlEncode(signature);
                  var requestUri = normalizedUrl + "?" + "oauth_callback=https://www.xyz.com" +"?"+ normalizedRequestParameters + "&oauth_signature=" + myOAuth.UrlEncode(signature);
                  Console.WriteLine(requestUri);


                  var request = (HttpWebRequest)WebRequest.Create(requestUri.ToString());
                  request.Method = WebRequestMethods.Http.Post;
                  request.ContentType = "application/json";
                //  request.ContentType = "application / x - www - form - urlencoded";
                  //request.Credentials = CredentialCache.DefaultCredentials;
                  //request.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0)";
                  var response = request.GetResponse();
                  var reader = new StreamReader(response.GetResponseStream());
                  var accessToken = reader.ReadToEnd();
                    }
                    }
            catch(Exception ex)
            {
              Console.Writeln(ex.toString());
            }
            }

下面是我的代码中断的行：-

         var response = request.GetResponse();

在这个问题上完全束手无策，无法找到它的根源。任何帮助任何方向都将受到高度赞赏。任何建议都会有很大帮助！！
提前致谢！

Answer 1

这是怎么做的：

1. 使用 GET 而不是 POST（POST 可能有效；我没有尝试过，并且在 500px 和 POST 方面收效甚微）

2. 在查询 URL 中包含您在授权步骤中收到的 oauth_verifier

3. 使用您的消费者密钥和请求令牌秘密签署整个查询（在步骤 1 中返回）

应在 HTTP 回复正文中返回“oauth_token=...&oauth_token_secret=...”的代码 sn-p。

确保您的 OAuth 实施不会删除任何以“oauth_”开头的参数！我的是，它正在剥离 500px 所需的 oauth_verifier 参数。

        OAuth.OAuthBase oauth = new OAuth.OAuthBase();

        string strUrl = "";
        string strParams = "";

        string signature = oauth.GenerateSignature(new Uri(API_URL + "oauth/access_token?oauth_verifier=" + this.oauthVerifier),
                                            this.consumerKey, this.consumerSecret, this.oauthToken, this.requestTokenSecret,
                                            "GET", oauth.GenerateTimeStamp(), oauth.GenerateNonce(),
                                            OAuth.OAuthBase.SignatureTypes.HMACSHA1,
                                            out strUrl, out strParams);

        string authorizationUrl = strUrl + "?" + strParams + "&oauth_signature=" + System.Web.HttpUtility.UrlEncode(signature);
        Debug.WriteLine("url>" + authorizationUrl);

        Response reply = SendGetRequest(authorizationUrl);
        if (reply.Success)
        {
            Debug.WriteLine("access_token>" + reply.Content);