Azure通过api认证过程401清除cdn

Question

我试图通过azure api清除缓存。

1. 我创建了一个名为＆＃34;清除CDN APP＆＃34;的Azure Active Directory / App Registration。

权限：

Windows Azure Active Directory /委托权限/登录并阅读用户个人资料

Windows Azure服务管理API /委派权限/作为组织用户访问Azure服务管理（预览）

键： 我创造了一把钥匙。我进入guid并返回一个密钥。我用这个作为我的客户秘密。

1. 我有一个终点＆＃34; CDN端点＆＃34;。我添加了一个撰稿人＆＃34;清除CDN APP＆＃34;

我能够生成令牌。但是，我收到401错误。这里有很多步骤。你能指出我哪里出错了吗？我使用的客户ID来自应用注册应用ID。

   private static string GetAccessTokenAndMakePurgeCall()
   {
            var subscriptionId = "xxxxx-xxxx-4dd7-8fec-ad3cd882b066";
            var resourceGroup = "xxxHosting";
            var profileName = "nameofcdn";
            var endpointName = "nameofendpoint"; 
            var apiVersion = "2016-10-02";
            var url = string.Format(
                "https://management.azure.com/subscriptions/{0}/resourceGroups/{1}/providers/Microsoft.Cdn/profiles/{2}/endpoints/{3}/purge?api-version={4}", 
                subscriptionId,
                resourceGroup,
                profileName,
                endpointName,
                apiVersion);


            string clientId = ConfigurationManager.AppSettings["clientId"];
            string clientSecret = ConfigurationManager.AppSettings["clientSecret"];
            var authenticationContext = new AuthenticationContext("https://login.microsoftonline.com/microsoft.onmicrosoft.com");
            ClientCredential clientCredential = new ClientCredential(clientId, clientSecret);
            Task<AuthenticationResult> resultstr = authenticationContext.AcquireTokenAsync("https://management.core.windows.net/", clientCredential);

            WebClient client = new WebClient();
            var token = resultstr.Result.AccessToken;
            client.Headers.Add(HttpRequestHeader.Authorization, "Bearer " + token);
            client.Headers.Add(string.Format("api-version:{0}", apiVersion));
            client.Headers.Add("Content-Type", "application/json");

            var bodyText = "{\"ContentPaths\":[\"/*\"]}";

            try
            {
                var result = client.UploadString(url, bodyText);
                return result;
            }
            catch (Exception ew)
            {
                return ew.Message;
            }
        }