v2board/routes/web.php

<?php
use Illuminate\Http\Request;
/*
|--------------------------------------------------------------------------
| Web Routes
|--------------------------------------------------------------------------
|
| Here is where you can register web routes for your application. These
| routes are loaded by the RouteServiceProvider within a group which
| contains the "web" middleware group. Now create something great!
|
*/

Route::get('/', function (Request $request) {
    if (config('v2board.app_url')) {
        if ($request->server('HTTP_HOST') !== parse_url(config('v2board.app_url'))['host']) {
            abort(403);
        }
    }
    return view('app', [
        'title' => config('v2board.app_name', 'V2Board'),
        'theme' => config('v2board.app_theme', 1),
        'verison' => '1.0.2.3'
    ]);
});