.Content返回NULL

Question

我正在尝试连接到API。我已经按照文档进行操作，但是.Content返回NULL。谁能协助我找出原因？我的目标是.NET 4.5.2，并使用最新版本的RestSharp（106.5.4）。

    var tokenclient = new RestClient("[api url]");
    var tokenrequest = new RestRequest(Method.POST);
    tokenrequest.AddParameter("undefined", "client_id=xxx&client_secret=xxx&grant_type=client_credentials", ParameterType.RequestBody);
    tokenrequest.AddHeader("cache-control", "no-cache");
    tokenrequest.AddHeader("Content-Type", "application/x-www-form-urlencoded");
    tokenrequest.AddHeader("grant_type", "client_credentials");
    IRestResponse tokenreceived = tokenclient.Execute(tokenrequest);
    var content = tokenreceived.Content; <-- .Content is returning NULL

Answer 1

解决方案是将此行添加到新的RestClient（...）

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls; 
        var tokenclient = new RestClient("[api-url]");

https://github.com/restsharp/RestSharp/issues/942