How to add app_dev.php to asset in Symfony 2

How to add app_dev.php to asset in Symfony 2

I am using:
{{ asset('contact') }} (e.g.)
to generate the URL for my contact page, which outputs:
http://localhost.project/contact.
But I am in development enviroment.
How can I make asset display url for development enviroment?
As it should be:
http://localhost.project/web/app_dev.php/contact
Not
http://localhost.project/web/contact
Thanks in advance!