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{{short description|Web application model}}
'''Comet''' is a [[web application]] model in which a long-held [[HTTPS]] request allows a [[web server]] to [[Push technology|push]] data to a [[web browser|browser]], without the browser explicitly requesting it.<ref name=
▲'''Comet''' is a [[web application]] model in which a long-held [[HTTPS]] request allows a [[web server]] to [[Push technology|push]] data to a [[web browser|browser]], without the browser explicitly requesting it.<ref name='MASH'>{{cite web | url = http://www.infoworld.com/d/developer-world/ajax-alliance-recognizes-mashups-559 | title = AJAX alliance recognizes mashups | access-date = 2010-10-20 | last = Krill | first = Paul | date = September 24, 2007 | publisher = [[InfoWorld]]}}</ref><ref name="CRANG">{{cite book|title=Comet and Reverse Ajax: The Next-Generation Ajax 2.0|last2=McCarthy|first2=Phil|date=October 13, 2008|publisher=[[Apress]]|isbn=978-1-59059-998-3|last1=Crane|first1=Dave}}<!--| accessdate = 2010-10-20 --></ref> ''Comet'' is an [[umbrella term]], encompassing multiple techniques for achieving this interaction. All these methods rely on features included by default in browsers, such as [[JavaScript]], rather than on non-default plugins. The Comet approach differs from the [[World Wide Web#Function|original model of the web]], in which a browser requests a complete web page at a time.<ref name = "WRC" />
The use of Comet techniques in [[web development]] predates the use of the word ''Comet'' as a [[neologism]] for the collective techniques. Comet is known by several other names, including
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|archive-date = 2006-02-08
}}
</ref> The term ''Comet'' is not an acronym, but was coined by Alex Russell in his 2006 [[blog]] post.
|url = http://infrequently.org/2006/03/comet-low-latency-data-for-the-browser/
|title = Comet: Low Latency Data for the Browser
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|last = Russell
|date = 2006-03-04
|access-date = 2014-11-02
}}</ref>{{
In recent years{{When|date=January 2025}}, the standardisation and widespread support of [[WebSocket]] and [[Server-sent events]] has rendered the Comet model obsolete.
==History==
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| archive-url = https://web.archive.org/web/20210308093626/https://www.dsc.soic.indiana.edu/sites/default/files/tr_9921.pdf
| url-status = dead
}}</ref> The framework has been commercialized by [http://www.collabworx.com CollabWorx] and used in a dozen or so Command&Control and Training applications in the United States Department of Defense{{
===First Comet applications===
The first set of Comet implementations dates back to 2000,<ref name="CometDaily_History">{{cite web |url=http://cometdaily.com/2007/10/19/comet-and-push-technology/ |title=CometDaily: Comet and Push Technology |access-date=2007-12-15 |archive-url=https://web.archive.org/web/20071113174053/http://cometdaily.com/2007/10/19/comet-and-push-technology/ |archive-date=2007-11-13 |url-status=dead }}</ref>{{unreliable source?|date=November 2017}} with the [[Pushlets]], [[Lightstreamer]], and KnowNow projects. [[Pushlets]], a framework created by Just van den Broecke, was one of the first<ref name="pushlets-javaworld">Just van den Broecke (1 March 2000). “[http://www.javaworld.com/article/2076063/java-web-development/pushlets--send-events-from-servlets-to-dhtml-client-browsers.html Pushlets: Send events from servlets to DHTML client browsers] {{Webarchive|url=https://web.archive.org/web/20140804175811/http://www.javaworld.com/article/2076063/java-web-development/pushlets--send-events-from-servlets-to-dhtml-client-browsers.html |date=2014-08-04 }}”. JavaWorld. Retrieved 1 August 2014.</ref> open source implementations. Pushlets were based on server-side Java servlets, and a client-side JavaScript library. Bang Networks{{snd}} a [[Silicon Valley]] start-up backed by [[Netscape]] co-founder [[Marc Andreessen]]{{snd}} had a lavishly
|url=http://news.cnet.com/2100-1023-255088.html
|title=Will the "refresh" button become obsolete?
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Browser-native technologies are inherent in the term Comet. Attempts to improve non-polling HTTP communication have come from multiple sides:
* The [[HTML 5]]
* The [[HTML 5]] [[WebSocket]] API working
{{cite web
|url=http://www.w3.org/TR/websockets/
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}}</ref>
* Use of plugins, such as [[Java applet]]s or the proprietary [[Adobe Flash]] (using [[Real-Time Messaging Protocol|RTMP]] protocol for data streaming to Flash applications). These have the advantage of working identically across all browsers with the appropriate plugin installed and need not rely on HTTP connections, but the disadvantage of requiring the plugin to be installed
* [[Google]] announced<ref>App, The. (2010-12-02) [
==See also==
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== Notes ==
{{
==References==
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