Simple Update Protocol

Simple Update Protocol, or SUP, is a protocol developed by FriendFeed to simplify and speed up RSS and Atom feed updates. Updates from services that supported the protocol would appear on FriendFeed within seconds,[1] until support was dropped. These sites include Disqus, Identi.ca, reddit.[2]

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 poll a small number of SUP feeds instead of polling each individual feed.[1]

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.[1]

SUP feeds are intended to be managed by services that publish large amounts of RSS and Atom feeds,[3] though FriendFeed also hosted a public SUP feed which anyone could post updates to.[4] The mechanism for posting updates to a public SUP feed is not standardised.

Past Support
  • Brightkite supported SUP[1] but was itself shutdown in April 2012.
  • YouTube's API v2.0 supported SUP,[5] 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.[6]

References
  1. Paul Buchheit. Simple Update Protocol: Fetch updates from feeds faster, FriendFeed Blog, August 27, 2008.
  2. Paul Buchheit. Simple Update Protocol: Update, FriendFeed Blog, December 18, 2008.
  3. Frequently asked questions about SUP
  4. Public SUP feed, FriendFeed API, archived February 20, 2008 from the original.
  5. Developer's Guide: Data API Protocol – Simple Update Protocol (SUP), Google Code: Youtube APIs and tools, archived November 13, 2011 from the original.
  6. Subscribe to Push Notifications, Youtube - Data API

See also


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