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Improve specification explanation #7601

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Improve specification explanation
matthieu88160 Mar 8, 2017
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Minor reword and fixed the line length
javiereguiluz Mar 13, 2017
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Update expiration.rst
matthieu88160 Mar 13, 2017
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Update expiration.rst
matthieu88160 Mar 13, 2017
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matthieu88160 Mar 13, 2017
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matthieu88160 Mar 13, 2017
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7 changes: 7 additions & 0 deletions http_cache/expiration.rst
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Expand Up @@ -85,5 +85,12 @@ the lifetime calculation vulnerable to clock skew. Another limitation
of the ``Expires`` header is that the specification states that "HTTP/1.1
servers should not send ``Expires`` dates more than one year in the future."

.. note::

Accordingly with `RFC 7234 - Caching`_, the ``Expires`` header value is
ignored when ``s-maxage`` or ``max-age`` directives are defined.


.. _`expiration model`: http://tools.ietf.org/html/rfc2616#section-13.2
.. _`FrameworkExtraBundle documentation`: https://symfony.com/doc/current/bundles/SensioFrameworkExtraBundle/annotations/cache.html
.. _`RFC 7234 - Caching`: https://tools.ietf.org/html/rfc7234#section-4.2.1