Here are several ways. Choose most convenient.
Configure your web server to redirect all non-secure requests to https. Example of a nginx config:
server {
listen 80 default_server;
listen [::]:80 default_server;
server_name example.com www.example.com;
return 301 https://example.com$request_uri;
}
Set your environment variable APP_URL using https:
APP_URL=https://example.com
Use helper secure_url() (Laravel5.6)
Add following string to AppServiceProvider::boot() method (for version 5.4+):
\Illuminate\Support\Facades\URL::forceScheme('https');
Update:
Implicitly setting scheme for route group (Laravel5.6):
Route::group(['scheme' => 'https'], function () {
// Route::get(...)->name(...);
});