Memento Project
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.
This article's tone or style may not reflect the encyclopedic tone used on Wikipedia. (November 2019) |
This article includes a list of general references, but it lacks sufficient corresponding inline citations. (May 2010) |
Technical description
Memento is defined in RFC 7089 as an implementation of the time dimension of content negotiation. HTTP accomplishes negotiation of content via a variety of headers that allow clients and servers to find content that the user desires.
| Request Header | Response Header | Dimension | Examples | Reference |
|---|---|---|---|---|
| Accept | Content-Type | content-type of the representation | text/html text/plain image/png | RFC 7231 RFC 2616 |
| Accept-Language | Content-Language | language of the representation | en en-US cz | RFC 7231 RFC 2616 |
| Accept-Encoding | Content-Encoding | medium, typically compression, that the content has been encoded with | compress gzip deflate | RFC 7231 RFC 2616 |
| Accept-Charset | Content -Type | the character set used by the web page | iso-8859-5 unicode-1-1 | RFC. 7231 RFC 2616 |
| Accept-Datetime | Memento-Datetime | time of the representation | Fri, 15 Aug 2014 13:43:03 GMT | RFC 7089 |
To understand Memento fully, one must realize that the Last-Modified header provided by HTTP 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.
Usage
One can find copies of page by simply navigating, in a web browser, to a link formatted, replacing urltoarchive with the full URL of the page desired:
JSON description of a Memento:
http://timetravel.mementoweb.org/api/json/YYYY/urltoarchivehttp://timetravel.mementoweb.org/api/json/YYYYMM/urltoarchivehttp://timetravel.mementoweb.org/api/json/YYYYMMDD/urltoarchivehttp://timetravel.mementoweb.org/api/json/YYYYMMDDHH/urltoarchivehttp://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/urltoarchivehttp://timetravel.mementoweb.org/memento/YYYYMM/urltoarchivehttp://timetravel.mementoweb.org/memento/YYYYMMDD/urltoarchivehttp://timetravel.mementoweb.org/memento/YYYYMMDDHH/urltoarchivehttp://timetravel.mementoweb.org/memento/YYYYMMDDHHMM/urltoarchive
References
External links
- Memento Project
- The When of the Web - Extensive information about the proposal and experiment is available in the November 2009 paper
- Memento: Time Travel for the Web
- http://lanlsource.lanl.gov/hello
- http://www.cdlib.org/cdlinfo/2010/02/04/web-archive-discovery-memento-implementation-meeting/
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