add_header X-Frame-Options SAMEORIGIN;

// /app/Http/Kernel.php
protected $middleware = [
  \Illuminate\Http\Middleware\FrameGuard::class,
];

<?php
 
namespace Illuminate\Http\Middleware;
 
use Closure;
 
class FrameGuard
{
  /**
   * Handle the given request and get the response.
   *
   * @param \Illuminate\Http\Request $request
   * @param \Closure $next
   * @return \Symfony\Component\HttpFoundation\Response
   */
  public function handle($request, Closure $next)
  {
    $response = $next($request);
 
    $response->headers->set('X-Frame-Options', 'SAMEORIGIN', false);
 
    return $response;
  }
}