Simple Update Protocol

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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^{[failed verification]}.^[2]

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.

• 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]

• Simple Update Protocol's Draft Specification

• PubSubHubbub

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