在发送请求前加:
ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3;
System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
ServicePointManager.ServerCertificateValidationCallback=new System.Net.Security.RemoteCertificateValidationCallback(CheckValidationResult);

public static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
{
return true;
}
本文介绍如何在发送请求前设置SSL3和TLS1.2协议,并自定义证书验证回调函数实现对远程证书的验证过程。
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