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:py:attr:`modified`
===================
The last-modified date of the feed, as specified in the
:abbr:`HTTP (Hypertext Transfer Protocol)` headers.
The purpose of :py:attr:`modified` is explained more fully in :ref:`http.etag`.
.. tip::
:py:attr:`modified` will only be present if the feed was retrieved from a web
server, and only if the web server provided a Last-Modified
:abbr:`HTTP (Hypertext Transfer Protocol)` header for the feed. If the feed
was parsed from a local file or from a string in memory, :py:attr:`modified`
will not be present.
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