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Comet (programming)
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<p>Comet is a <a href="/facts/Web_application/BLkF3BIN">web application</a> model in which a long-held <a href="/facts/HTTPS/MSWYz4zo">HTTPS</a> request allows a <a href="/facts/Web_server/A4GS6thA">web server</a> to <a href="/facts/Push_technology/KoRjtGET">push</a> data to a <a href="/facts/Web_browser/2pfyymLs">browser</a>, without the browser explicitly requesting it. <i>Comet</i> is an <a href="/facts/Umbrella_term/bjxUuoRb">umbrella term</a>, encompassing multiple techniques for achieving this interaction. All these methods rely on features included by default in browsers, such as <a href="/facts/JavaScript/XhhIIEsl">JavaScript</a>, rather than on non-default plugins. The Comet approach differs from the <a href="/facts/World_Wide_Web/wvnTrWFq">original model of the web</a>, in which a browser requests a complete web page at a time. </p><p>The use of Comet techniques in <a href="/facts/Web_development/UW5ypSzj">web development</a> predates the use of the word <i>Comet</i> as a <a href="/facts/Neologism/vlq6w82X">neologism</a> for the collective techniques. Comet is known by several other names, including <i>Ajax Push</i>, <i>Reverse Ajax</i>, <i>Two-way-web</i>, <i>HTTP Streaming</i>, and <i><a href="/facts/HTTP_push/KoRjtGET">HTTP server push</a></i> among others. The term <i>Comet</i> is not an acronym, but was coined by Alex Russell in his 2006 <a href="/facts/Blog/bb6awu2X">blog</a> post. </p><p>In recent years[<i>when?</i>], the standardisation and widespread support of <a href="/facts/WebSocket/NcQrqpnv">WebSocket</a> and <a href="/facts/Server-sent_events/rPwlPels">Server-sent events</a> has rendered the Comet model obsolete. </p>