app/Http/Middleware/PreventRequestsDuringMaintenance.php
<?php
namespace BookStack\Http\Middleware;
use Illuminate\Foundation\Http\Middleware\PreventRequestsDuringMaintenance as Middleware;
class PreventRequestsDuringMaintenance extends Middleware
{
/**
* The URIs that should be reachable while maintenance mode is enabled.
*
* @var array
*/
protected $except = [
//
];
}