.net httpclient 请求报错：One or more errors occurred. (The SSL connection could not be established, see inner exception.)

这是因为HttpClient请求的地址带https证书，如果遇到证书有问题，证书不合法什么的就请求不到了，我们可以这样设置一下解决这个问题。

// 防止错误：One or more errors occurred. (The SSL connection could not be established, see inner exception.)”
HttpClientHandler clientHandler = new HttpClientHandler();
clientHandler.ServerCertificateCustomValidationCallback += (sender, cert, chain, sslPolicyErrors) => { return true; };
clientHandler.SslProtocols = SslProtocols.None;
HttpClient client = new HttpClient(clientHandler);

一般这种错误都是测试环境出现的，正式环境请求一般都内部地址，速度也会快很多。