Indy http client中断一个长时间的下载

THTTPThread = class(TThread)
    private
        HTTPComponent: TidHTTP;
        procedure OnHTTPProgress(ASender: TObject; AWorkMode: TWorkMode;
                                     AWorkCount: Int64);
    published
        procedure execute();
end;

implementation
procedure THTTPThread.execute;
begin
    Self.HTTPComponent := TidHTTP.Create(nil);
    with HTTPComponent do
    begin
        OnWork := Self.OnHTTPProgress;
        Get('http://www.google.com');
    end;
end;

procedure THTTPThread.OnHTTPProgress(ASender: TObject; AWorkMode: TWorkMode;
  AWorkCount: Int64);
begin

    if Self.Terminated then
        Abort;
end;