jandl-taskmanager-app/be/app/Http/Controllers/HorizonHomeController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Support\Facades\App;
use Illuminate\Support\Str;
use Laravel\Horizon\Horizon;
use Laravel\Horizon\Http\Controllers\HomeController;

class HorizonHomeController extends HomeController
{
    /**
     * Overrides default horizon route to support subdirectory hosting.
     */
    public function index ()
    {
        // We use a plain request to check for the base url.
        $request = request();

        // Set up our base path.
        $base_path = Str::substr($request->getBasePath(), 1);
        if (!empty($base_path)) {
            $base_path .= '/';
        }

        // Patch default horizon variables with our own base path.
        $variables = Horizon::scriptVariables();
        $variables['path'] = $base_path . config('horizon.path');

        // Render horizon's home view.
        return view('horizon::layout', [
            'assetsAreCurrent'       => Horizon::assetsAreCurrent(),
            'horizonScriptVariables' => $variables,
            'cssFile'                => Horizon::$useDarkTheme ? 'app-dark.css' : 'app.css',
            'isDownForMaintenance'   => App::isDownForMaintenance(),
        ]);
    }
}