oAuth2 网络请求在浏览器中有效，但在应用程序中无效

Question

我有以下代码示例，我试图在 Xamarin 表单应用程序中验证 Azure 活动目录用户

URL（我已经删除了实际的客户端 ID）在浏览器中可以正常工作，但在尝试发送 http 请求时失败

错误消息显示“响应类型必须包含 client_id”

            string URL = "https://login.microsoftonline.com/common/oauth2/v2.0/authorize?"
                        + "client_id=xxxx-xxxxx-xxxxx-xxxxx-xxx"
                        + "&response_type=code"
                        + "&redirect_uri=https://login.microsoftonline.com/common/oauth2/nativeclient"
                        + "&response_mode=query"
                        + "&scope=openid%20offline_access%20https%3A%2F%2Fgraph.microsoft.com%2Fmail.read"
                        + "&state=12345";



            var webRequest = System.Net.WebRequest.Create(URL) as HttpWebRequest;

            System.Console.WriteLine(URL);

            if (webRequest != null)
            {
                webRequest.Method = "POST";
                webRequest.ServicePoint.Expect100Continue = false;
                webRequest.Timeout = 20000;

                webRequest.ContentType = "text/html";
                //POST the data.
                using (requestWriter = new StreamWriter(webRequest.GetRequestStream()))
                {
                    requestWriter.Write(postData);
                }
            }

            HttpWebResponse resp = (HttpWebResponse)webRequest.GetResponse();
            Stream resStream = resp.GetResponseStream();
            StreamReader reader = new StreamReader(resStream);

            ret = reader.ReadToEnd();

Answer 1

您将参数放在 URL 中，因此您需要使用 GET 方法，而不是 POST（就像您的浏览器在其地址栏中粘贴 URL 时所做的那样）。

所以，替换：

webRequest.Method = "POST";

作者：

webRequest.Method = "GET";

并删除：

//POST the data.
using (requestWriter = new StreamWriter(webRequest.GetRequestStream()))
  {
    requestWriter.Write(postData);
  }