Feed URI scheme

Short description: Suggested uniform resource identifier to subscribe web feeds.

The feed URI scheme was a suggested uniform resource identifier (URI) scheme designed to facilitate subscription to web feeds; specifically, it was intended that a news aggregator be launched whenever a hyperlink to a `feed` URI was clicked in a web browser. The scheme was intended to flag a document in a syndication format such as Atom or RSS. The document would be typically served over HTTP.

## History

In 2006 the `feed` URI scheme was supported by several popular desktop aggregators, including NetNewsWire, FeedDemon, Safari, and Flock. As of 2011[update] no effort seems to be underway to officially register the scheme at IANA.[1]

Critics hold that the purpose of the `feed` URI scheme is better served by MIME types,[2] or that it is not a user-friendly solution for the problem of feed subscription, since a user who has not installed the appropriate software will receive an unhelpful browser error message on clicking a link to a `feed` URI.

The `feed` URI scheme was suggested in 2003[3] in draft-obasanjo-feed-URI-scheme-01 and 02. These expired drafts were not submitted as Internet drafts; the author later contributed to the work on the atom standard.

## Syntax

The syntax for a `feed` URI may be expressed in Backus–Naur form as follows:

<feed_uri> ::= "feed:" <absolute_uri> | "feed://" <authority> <path-abempty>

Specifically, a `feed` URI may be formed from any absolute URI (such as an absolute URL) by prepending `feed`, and as a special case, may be formed from any absolute `http` URI by replacing the initial `http://` with `feed://`.

The <authority> and <path-abempty> constructs in the syntax are specified in RFC 3986 also known as STD 66. Here <authority> is in essence the userinfo@host:port part of the original `http` URI, and <path-abempty> is the following absolute path introduced by a slash "/"; it can be empty or absent. Therefore, the following are two examples of valid `feed` URIs:

feed:https://example.com/entries.atom
feed://example.com/entries.atom

## References

1. ↑ "Uniform Resource Identifier (URI) Schemes per RFC4395". Internet Assigned Numbers Authority. https://www.iana.org/assignments/uri-schemes.html.
2. ↑ Nemerson, Evan (September 10, 2004). "On the feed:// URI scheme". http://www.coeus-group.com/en/archives/187-On-the-feed-URI-scheme.html.
3. ↑ Dare Obasanjo (2003-12-09). "Request For Comments: The "feed" URI Scheme". 25hoursaday.com/weblog. http://www.25hoursaday.com/weblog/PermaLink.aspx?guid=2a056f3b-de38-4751-85e4-bea97a053ad4.

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Uniform Resource Identifier (URI) schemes

Official|

* about
* acct
* crid
* data
* file
* ftp
* geo
* gopher
* http
* https
* info
* ldap
* mailto
* nfs
* nntp
* sip / sips
* tag
* telnet
* urn
* view-source
* ws / wss
* xmpp

Unofficial|

* coffee
* ed2k
* feed
* finger
* irc / irc6 / ircs
* ldaps
* magnet
* rsync
* ymsgr

Protocol list

* v
* t
* e

Web syndication

History
Blogging
Podcasting
Vlogging
Web syndication technology

Types|

* Art
* Bloggernacle
* Classical music
* Corporate
* Dream diary
* Edublog
* Electronic journal
* Fake
* Family
* Fashion
* Food
* Health
* Law
* Lifelog
* Litblog
* MP3
* News
* Photoblog
* Police
* Political
* Prayer
* Project
* Reverse
* Travel
* Warblog

Technology|

| General|

* BitTorrent
* Feed URI scheme

|

Features|

* Linkback
* Permalink
* Ping
* Pingback
* Reblogging
* Refback
* Rollback
* Trackback

Mechanism|

* Conversation threading
* Geotagging
* RSS enclosure
* Synchronization

Memetics|

* Atom feed
* Data feed
* Photofeed
* Product feed
* RDF feed
* Web feed

RSS|

* GeoRSS
* MRSS
* RSS TV

Social|

* Inter-process communication
* Livemark
* Mashup
* Referencing
* RSS editor
* RSS tracking
* Streaming media

Standard|

* OML
* OPML
* RSS Advisory Board
* Usenet
* World Wide Web
* XBEL
* XOXO

Form|

* Audio podcast
* Enhanced podcast
* Mobilecast
* Narrowcasting
* Peercasting
* Screencast
* Slidecasting
* Videocast
* Webcomic
* Webtoon
* Web series

* Anonymous blogging
* Collaborative blog
* Columnist
* Instant messaging
* Liveblogging
* Microblog
* Mobile blogging
* Roblog
* Spam blog
* Video blogging
* Motovlogging

Media|

| Alternative media|

* Carnivals
* Fiction
* Journalism
* Citizen
* Database
* Online diary
* Search engines
* Sideblog
* Software
* Web directory

|

Micromedia|

* Aggregation
* News
* Poll
* Review
* Search
* Video
* Atom
* AtomPub
* Broadcatching
* Hashtag
* NewsML
* 1
* G2
* Social communication
* Social software
* Web Slice

Related|

* Blogosphere
* Escribitionist
* Glossary of blogging
* Pay per click
* Posting style
* Slashdot effect
* Spam in blogs
* Uses of podcasting

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