Co-authored-by: Peter van Dijk <peter.van.dijk@powerdns.com>
.. versionadded:: 1.9.0
Asynchronously resolve, via the system resolver (using ``getaddrinfo()``), the supplied ``hostname`` to IPv4 and IPv6 before invoking the supplied ``callback`` function with the ``hostname`` and a list of IPv4 and IPv6 addresses as :class:`ComboAddress`.
- For example, to get the addresses of Quad9's and dynamically add them as backends:
+ For example, to get the addresses of Quad9's resolver and dynamically add them as backends:
.. code-block:: lua