C# HttpWebRequest 無法建立 SSL/TLS 的安全通道

 

資料來源: https://hk.saowen.com/a/196b225c08d7a25db894d8c0d2176e3039224550172e90de7c8adaefc3e13ff6
 

在網上查了很多資料，基本是這麼一個思路：

在通過
HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url);
req.Method = “GET”; 
HttpWebResponse sp = (HttpWebResponse)req.GetResponse();
作處理時，有些輸入有些URL會在
HttpWebResponse sp = (HttpWebResponse)req.GetResponse();
的時候拋出一個“基礎連接已經關閉: 未能為 SSL/TLS 安全信道創建信任關係”的異常。
最簡單的辦法是:

 

1,先加入命名空間：
using System.Net.Security;
using System.Security.Authentication;
using System.Security.Cryptography.X509Certificates;

 

2，再重載CheckValidationResult方法，返回true
public bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors) {  return true; }

 

3,然後在HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url);
前面加上如下幾行代碼：
System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;
ServicePointManager.ServerCertificatidationCallback = new System.Net.Security.RemoteCertificatidationCallback(CheckValidationResult);//驗證服務器證書回調自動驗證