Spatie Sitemap not generating URLs on localhost

I am creating a website in Laravel 5.8 and using Spatie sitemap package to create Sitemap dynamically, It doesn't crawl my website and only generates homepage URL.

Route::get('/sitemap',function(){
    SitemapGenerator::create( 'http://localhost/' )->writeToFile('sitemap.xml');
})->name('sitemap-generator');

Note: But when I map website with a virtual host, It is working properly.

Route::get('/sitemap',function(){
    SitemapGenerator::create( 'http://local.project.com/' )->writeToFile('sitemap.xml');
})->name('sitemap-generator');

Any help will be appreciated.

via Chebli Mohamed