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) 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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