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``tornado.platform.caresresolver`` --- Asynchronous DNS Resolver using C-Ares
=============================================================================
.. module:: tornado.platform.caresresolver
This module contains a DNS resolver using the c-ares library (and its
wrapper ``pycares``).
.. py:class:: CaresResolver
Name resolver based on the c-ares library.
This is a non-blocking and non-threaded resolver. It may not produce
the same results as the system resolver, but can be used for non-blocking
resolution when threads cannot be used.
c-ares fails to resolve some names when ``family`` is ``AF_UNSPEC``,
so it is only recommended for use in ``AF_INET`` (i.e. IPv4). This is
the default for ``tornado.simple_httpclient``, but other libraries
may default to ``AF_UNSPEC``.
.. deprecated:: 6.2
This class is deprecated and will be removed in Tornado 7.0. Use the default
thread-based resolver instead.
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