1

我正在尝试使用此页面中的信息与 Google Reader (undocumented/unofficial) API 交互。我的第一步是获取一个 SID 和令牌，它工作正常，但我似乎无法发布任何内容而不会收到 401 错误。

这是我用来获取 SID 和令牌的代码：

static string getSid()
    {
        HttpWebRequest req = (HttpWebRequest)WebRequest.Create("https://www.google.com/accounts/ClientLogin?service=reader&Email=username&Passwd=password");
        req.Method = "GET";
        string sid;

        HttpWebResponse response = (HttpWebResponse)req.GetResponse();
        using (var stream = response.GetResponseStream())
        {
            StreamReader r = new StreamReader(stream);
            string resp = r.ReadToEnd();

            int indexSid = resp.IndexOf("SID=") + 4;
            int indexLsid = resp.IndexOf("LSID=");
            sid = resp.Substring(indexSid, indexLsid - 5);

            return sid;
        }
    }

并生成 cookie 并获取令牌：

    static Cookie getCookie(string sid)
    {
        Cookie cookie = new Cookie("SID", sid, "/", ".google.com");
        return cookie;
    }

    static string getToken(string sid, Cookie cookie)
    {
        string token;
        string url = "http://www.google.com/reader/api/0/token";

        HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
        req.CookieContainer = new CookieContainer();
        req.CookieContainer.Add(cookie);

        HttpWebResponse response = (HttpWebResponse)req.GetResponse();
        using (var stream = response.GetResponseStream())
        {
            StreamReader r = new StreamReader(stream);
            token = r.ReadToEnd();
            return token;
        }
    }

现在，如果我尝试使用以下内容进行 POST（在此示例中，插入新标签），则会收到 401 错误。

    static void insertTag(string tag, Cookie cookie)
    {
        string result = "";
        string data = Uri.EscapeDataString("a="+tag+"&T=" + Program.token);

        byte[] buffer = Encoding.GetEncoding(1252).GetBytes(data);
        HttpWebRequest WebReq = (HttpWebRequest)WebRequest.Create
            ("http://www.google.com/reader/api/0/edit-tag?client=-");
        WebReq.Method = "POST";

        WebReq.Credentials = new NetworkCredential("username", "password");


        WebReq.ContentType = "application/x-www-form-urlencoded";
        WebReq.ContentLength = buffer.Length;

        Stream PostData = WebReq.GetRequestStream();

        PostData.Write(buffer, 0, buffer.Length);
        PostData.Close();

        HttpWebResponse WebResp = (HttpWebResponse)WebReq.GetResponse();
        Stream Answer = WebResp.GetResponseStream();
        StreamReader _Answer = new StreamReader(Answer);
        result = _Answer.ReadToEnd();

        if (result.Length < 0)
            result = "";
    }

错误发生在线路上Stream Answer = WebResp.GetResponseStream();

4

2 回答 2

1

您需要仔细检查您是否设置了用户代理。在我没有设置它之前，我也遇到过同样的问题。

例如：

WebClient client = new WebClient();

client.Headers.Add("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705;)");

或：MSDN 链接

myHttpWebRequest=(HttpWebRequest)WebRequest.Create("http://www.contoso.com");
myHttpWebRequest.UserAgent="Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705;)";
于 2009-08-14T01:23:47.390 回答
1

原来我使用了错误的 URL 来访问 Google Reader API，这要归功于一些过时的文档！在 Google 阅读器中添加标签的正确 URL（截至 2009 年 8 月）是 http://www.google.com/reader/api/0/subscription/edit?client=scroll 和 POST 参数 a=user/-/label/ [你的标签]&s=feed/[feed url]&ac=edit&T=[token]

于 2009-08-15T03:02:32.797 回答