1.代码

function Tfrmmain.UploadData: Boolean;
var
  IdHTTP: TIdHTTP;
  SSLIO: TIdSSLIOHandlerSocketOpenSSL;
begin
  Result := False;
  IdHTTP := TIdHTTP.Create(nil);
  SSLIO := TIdSSLIOHandlerSocketOpenSSL.Create(nil);

  //https 协议
  if Pos('https',FSynconfigRec.DetailSendMsg_URL)>0 then
  begin
    IdHTTP.ProtocolVersion := pv1_1;
    IdHTTP.HandleRedirects := True;
    SSLIO.SSLOptions.Method:=sslvTLSv1; //post 函数需要用版本3
    SSLIO.SSLOptions.Mode := sslmClient;
    IdHTTP.IOHandler:=SSLIO;
  end;
  try
    try
      IdHTTP.get(FSynconfigRec.Proj_URL);
        Result := true;
    except
      on E: Exception do
        WriteLog(FTodayLog,'接口访问失败：' +FSynconfigRec.Proj_URL+ E.Message);
    end;

  finally
    IdHTTP.Free;   
    SSLIO.Free;
  end;
end;

2.单元引用 delphi 2010

IdComponent, IdIOHandler,  IdIOHandlerSocket, IdIOHandlerStack, IdSSL, IdSSLOpenSSL