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Memento Project
American web preservation project From Wikipedia, the free encyclopedia
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Memento is a United States National Digital Information Infrastructure and Preservation Program (NDIIPP)–funded project aimed at making Web-archived content more readily discoverable and accessible to the public.
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Technical description
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Perspective
Memento is defined in RFC 7089[1] as an implementation of the time dimension of content negotiation.[2] HTTP accomplishes negotiation of content via a variety of headers that allow clients and servers to find content that the user desires.
The Last-Modified header provided by HTTP[4] does not necessarily reflect when a particular version of a web page came into existence. Also, the Last-Modified header may not exist in some cases. To provide more information, the Memento-Datetime header has been introduced to indicate when a specific representation of a web page was observed on the web.[5]

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Usage
Copies of page can be found by simply navigating, in a web browser, to a link formatted, replacing urltoarchive
with the full URL of the page desired:[6]
JSON description of a Memento:
http://timetravel.mementoweb.org/api/json/YYYY/urltoarchive
http://timetravel.mementoweb.org/api/json/YYYYMM/urltoarchive
http://timetravel.mementoweb.org/api/json/YYYYMMDD/urltoarchive
http://timetravel.mementoweb.org/api/json/YYYYMMDDHH/urltoarchive
http://timetravel.mementoweb.org/api/json/YYYYMMDDHHMM/urltoarchive
- or
redirect to a Memento with a datetime that is close to a desired datetime:
http://timetravel.mementoweb.org/memento/YYYY/urltoarchive
http://timetravel.mementoweb.org/memento/YYYYMM/urltoarchive
http://timetravel.mementoweb.org/memento/YYYYMMDD/urltoarchive
http://timetravel.mementoweb.org/memento/YYYYMMDDHH/urltoarchive
http://timetravel.mementoweb.org/memento/YYYYMMDDHHMM/urltoarchive
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References
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