Facebook 访问 token 400 错误请求

Question

我正在使用以下代码来检索 facebook accessToken

string url = "https://graph.facebook.com/oauth/access_token?" +
                         "client_id={0}" +
                         "&redirect_uri={1}" +
                         "&client_secret={2}" +
                         "&code={3}";
            url = string.Format(url, clientId, redirectUri.EncodeUrl(), clientSecret, code);
            //Create a webrequest to perform the request against the Uri
            WebRequest request = WebRequest.Create(url);
            try
            {
                //read out the response as a utf-8 encoding and parse out the access_token
                using (WebResponse response = request.GetResponse())
                {
                    using (Stream stream = response.GetResponseStream())
                    {
                        //string urlRedirects = response.ResponseUri.ToString();
                        Encoding encode = Encoding.GetEncoding("utf-8");
                        if (stream != null)
                        {
                            StreamReader streamReader = new StreamReader(stream, encode);
                            string accessToken = streamReader.ReadToEnd().Replace("access_token=", "");
                            streamReader.Close();
                            response.Close();
                            return accessToken;
                        }
                    }
                }
            }
            catch
            {
                return null;
            }

但是我不断收到这条模棱两可的错误信息

{
"error": {
"message": "Error validating verification code.",
"type": "OAuthException",
"code": 100
}
}

我检查了代码 100“无效参数”对我来说意义不大。

有人遇到过类似的问题吗？

Answer 1

1. 检查您是否在 url 中添加了正确的代码例如

   http://www.xyz.com/?code=AQC399oXame3UKmoAMYnqkZOEXPDNa8ZUFEY9sc6I4YNQnNT-ZgHzpMNnQVZrCUBZVqJRIB1QrXC5xW58_8MNIgQol_PaQvYssUM8OiKjSY5aoqGLBMuCeeHsSqP_mRTd1xiK0iretZcXwMm_27lFYrWFw345Mxod_lfJuB8zI13E8wJUQiArXW_ZlGLNcyxh20#_=_
   

代码必须是

    code = AQC399oXame3UKmoAMYnqkZOEXPDNa8ZUFEY9sc6I4YNQnNT-ZgHzpMNnQVZrCUBZVqJRIB1QrXC5xW58_8MNIgQol_PaQvYssUM8OiKjSY5aoqGLBMuCeeHsSqP_mRTd1xiK0iretZcXwMm_27lFYrWFw345Mxod_lfJuB8zI13E8wJUQiArXW_ZlGLNcyxh20

代码不应该包含在最后

    #_=_ 

如果以上没有解决问题

2. redirect_uri 必须以/结尾

redirect_uri=http://www.xyz.com/

下面给出了一些上面提到的错误

redirect_uri=http://www.xyz.com

3.还要确保Facebook 上的应用程序 和使用 Facebook 登录的网站 设置了相同的地址例如 http://www.xyz.com/