Symfony on non-standard ports

As Symfony (2.0) doc is not very clear on this subject, I spent some time to help a colleague on the following question : How to make HTTPS port different from 443 ?

Of course it's possible, and this is a simple configuration option in app/config.yml :

framework:

   ...

    # router configuration
    router:
        ...
        http_port:            81
        https_port:           1443

    ...

Official doc shows it in the Reference chapter, but not in table of indexes... Let's see http://symfony.com/doc/2.0/reference/configuration/framework.html#full-default-configuration