First change your application URL in the file config/app.php (or the APP_URL value of your .env file):
'url' => 'http://www.example.com',
Then, make the URL generator use it. Add thoses lines of code to the file app/Providers/AppServiceProvider.php in the boot method:
\URL::forceRootUrl(\Config::get('app.url'));
// And this if you wanna handle https URL scheme
// It's not usefull for http://www.example.com, it's just to make it more independant from the constant value
if (\Str::contains(\Config::get('app.url'), 'https://')) {
\URL::forceScheme('https');
//use \URL:forceSchema('https') if you use laravel < 5.4
}
That’s all folks.