imported>JJMC89 bot III: Moving :Category:Atom (Web standard) to :Category:Atom (web standard) per Wikipedia:Categories for discussion/Speedy

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Moving Category:Atom (Web standard) to Category:Atom (web standard) per Wikipedia:Categories for discussion/Speedy

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{{notability|date=August 2014}}
{{Primary sources|date=December 2009}}
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'''Simple Update Protocol''', or '''SUP''', is a protocol developed by [[FriendFeed]] to simplify and speed up [[RSS]] and [[Atom (standard)|Atom]] feed updates. Updates from services that supported the protocol would appear on FriendFeed within seconds,<ref name=announcement>[[Paul Buchheit]]. [http://blog.friendfeed.com/2008/08/simple-update-protocol-fetch-updates.html ''Simple Update Protocol: Fetch updates from feeds faster''], ''FriendFeed Blog'', August 27, 2008. </ref> until support was dropped. These sites include [[Disqus]], [[Identi.ca]], [[reddit]]{{Failed verification|date=May 2011}}.<ref>[[Paul Buchheit]]. [http://blog.friendfeed.com/2008/12/simple-update-protocol-update.html ''Simple Update Protocol: Update''], ''FriendFeed Blog'', December 18, 2008. </ref>

== Functioning ==

SUP introduces SUP feeds, which are lists of RSS and Atom feeds that have updated recently. A feed consumer (like FriendFeed, or a [[feedreader]]) can regularly [[Polling (computer science)|poll]] a small number of SUP feeds instead of polling each individual feed.<ref name=announcement />

RSS and Atom feeds are identified in SUP feeds by an opaque, unique identifier derived from their URL. This allows a SUP feed to index private feeds without revealing their URL.<ref name=announcement />

SUP feeds are intended to be managed by services that publish large amounts of RSS and Atom feeds,<ref>[https://code.google.com/archive/p/simpleupdateprotocol/wikis/faq.wiki ''Frequently asked questions about SUP'']</ref> though FriendFeed also hosted a public SUP feed which anyone could post updates to.<ref>[https://web.archive.org/web/20090220145414/http://friendfeed.com/api/public-sup ''Public SUP feed''], ''FriendFeed API'', archived February 20, 2008 from [http://friendfeed.com/api/public-sup the original].</ref> The mechanism for posting updates to a public SUP feed is not standardised.

== Past Support ==

* [[Brightkite]] supported SUP<ref name=announcement /> but was itself shutdown in April 2012.
* [[YouTube]]'s API v2.0 supported SUP,<ref>[https://web.archive.org/web/20111130085515/http://code.google.com/apis/youtube/2.0/developers_guide_protocol_sup.html ''Developer's Guide: Data API Protocol – Simple Update Protocol (SUP)''], ''Google Code: Youtube APIs and tools'', archived November 13, 2011 from [http://code.google.com/apis/youtube/2.0/developers_guide_protocol_sup.html the original].</ref> but that version of the API was deprecated in 2014 and YouTube's SUP feed was eventually shut down. YouTube data API v3 supports [[PubSubHubbub]] instead.<ref>[https://developers.google.com/youtube/v3/guides/push_notifications ''Subscribe to Push Notifications''], ''Youtube - Data API''</ref>

==References==
{{reflist}}

==External links==
*[https://web.archive.org/web/20090228211225/http://simpleupdateprotocol.googlecode.com/svn/trunk/spec/draft-clinton-sup-current.html Simple Update Protocol's Draft Specification]

==See also==
* [[PubSubHubbub]]

[[Category:Network protocols]]
[[Category:Internet protocols]]
[[Category:Application layer protocols]]
[[Category:RSS]]
[[Category:Atom (web standard)]]

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Simple Update Protocol - Revision history

imported>JJMC89 bot III: Moving :Category:Atom (Web standard) to :Category:Atom (web standard) per Wikipedia:Categories for discussion/Speedy