Laravel middleware code to add response headers to prevent SEO indexing.

PreventSEOIndexingHeaders.php

<?php

namespace App\Http\Middleware;

use Closure;

class PreventSEOIndexingHeaders
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        $response = $next($request);
        $response->header('X-Robots-Tag', 'none, noarchive, noimageindex');
        return $response;
    }
}