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