关于RestSharp cookie管理的问题

为何我设置了CookieContainer却不生效呢？代码如下

IRestClient client = new RestClient("https://localhost");

client.CookieContainer = new System.Net.CookieContainer();

var request = new RestRequest("/login", Method.POST); 

request.AddHeader("Content-Type", "application/x-www-form-urlencoded");
request.AddParameter("user", "test");
request.AddParameter("password", "123456");

IRestResponse response = client.Execute(request);

var request2 = new RestRequest("/info", Method.POST);

request2.AddHeader("Content-Type", "application/x-www-form-urlencoded");
request2.AddParameter("page", "1");
request2.AddParameter("number", "20");

IRestResponse response2 = client.Execute(request2);

OS: Windows7
.NET version: .NET 4
Version: 105.2.3.0