系统从.net framework 升级到dotnet core2.1

原先工作正常的httpclient，会报SSL connection could not be established error 错误

在.net framework中通过ServicePointManager,当证书出错时，可以跳过证书验证。

ServicePointManager.ServerCertificateValidationCallback += (sender, cert, chain, sslPolicyErrors) => true

升级到dotnet core 2.1后，发现以上配置无效。

　　原因是ServicePointManager只对HttpWebRequest有效，.net framework中httpclient是基于HttpWebRequest实现的，所以Httpclient不会报错

在dotnetcore2.1中，Httpclient想要实现相同的功能，需要在HttpClient中设置。

 var handler = new HttpClientHandler

 {

     ServerCertificateCustomValidationCallback = delegate { return true; }

 };

github上有人提过这个问题，可以参见 https://github.com/dotnet/corefx/issues/29452

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