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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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