import javax.servlet.*;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class OptionsVerifyTwoRule implements Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {}

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        HttpServletResponse res = (HttpServletResponse) response;
        res.addHeader("X-Frame-Options", "iframe");
        chain.doFilter(request, response);
    }

    @Override
    public void destroy() {}
}