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.. _mod-serve_stale:
Serve stale
-----------
Demo module that allows using timed-out records in case kresd is
unable to contact upstream servers.
By default it allows stale-ness by up to one day,
after roughly four seconds trying to contact the servers.
It's quite configurable/flexible; see the beginning of the module source for details.
See also the RFC draft_ (not fully followed) and :any:`cache.ns_tout`.
Running
^^^^^^^
.. code-block:: lua
modules = { 'serve_stale < cache' }
.. _draft: https://tools.ietf.org/html/draft-ietf-dnsop-serve-stale-00
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