animethemes-server/app/Http/Middleware/Api/SetAcceptJsonHeader.php

<?php

declare(strict_types=1);

namespace App\Http\Middleware\Api;

use Closure;
use Illuminate\Http\Request;

class SetAcceptJsonHeader
{
    /**
     * @param  Closure(Request): mixed  $next
     */
    public function handle(Request $request, Closure $next): mixed
    {
        $request->headers->set('Accept', 'application/json');

        return $next($request);
    }
}