动态使indy使用TLSv1.2

GitHub已停止支持TLS v1.0和v1.1( https://githubengineering.com/crypto-deprecation-notice/ ),因此我的代码不再想从中下载。我已经检查过了,似乎需要让Indy使用TLS v1.2,如下所述: Using Indy 10 IdHTTP with TLS 1.2 .

我已经从将OpenSSL DLL更新为最新版本 http://indy.fulgan.com/SSL/ ,Indy似乎加载得很好,但我仍然得到一个错误。

我得到的错误:

如果在工作线程中动态创建Indy对象,如何使Indy使用TLS v1.2?

当前代码:

constructor TDownload.Create(CreateSuspended: Boolean; aurl, afilename: string);
begin
  inherited Create(CreateSuspended);
  httpclient := TIdHTTP.Create(nil);
  httpclient.Request.UserAgent := 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36';
  httpclient.IOHandler := TIdSSLIOHandlerSocketOpenSSL.Create(httpclient);
  httpclient.HandleRedirects := True;
  httpclient.OnWorkBegin := idhttp1WorkBegin;
  httpclient.OnWork := idhttp1Work;
  url := aurl;
  filename := afilename;
end;