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---
title: Server-sent events
slug: Web/API/Server-sent_events
tags:
- NeedsTranslation
- Server-sent events
- TopicStub
translation_of: Web/API/Server-sent_events
original_slug: Server-sent_events
---
<p>Traditionally, a web page has to send a request to the server to receive new data; that is, the page requests data from the server. With server-sent events, it's possible for a server to send new data to a web page at any time, by pushing messages to the web page. These incoming messages can be treated as <em><a href="/en-US/docs/DOM/event" title="DOM/Event">Events</a> + data</em> inside the web page.</p>
<table class="topicpage-table">
<tbody>
<tr>
<td>
<h2 class="Documentation" id="Documentation" name="Documentation">Documentation</h2>
<dl>
<dt>
<a href="/en-US/docs/Server-sent_events/Using_server-sent_events" title="Server-sent events/Using server-sent events">Using server-sent events</a></dt>
<dd>
A tutorial guide to writing both server and client side part of a server-sent events app.</dd>
<dt>
<a href="/en-US/docs/Server-sent_events/EventSource" title="Server-sent events/EventSource">EventSource reference</a></dt>
<dd>
A reference to the client-side EventSource API.</dd>
</dl>
<p><span class="alllinks"><a href="/en-US/docs/tag/Server-sent_events" title="tag/Server-sent events">View All...</a></span></p>
</td>
<td>
<h2 class="Tools" id="Tools" name="Tools">Tools</h2>
<ul>
<li>Remy Sharp’s <a class="link-https" href="https://github.com/remy/polyfills/blob/master/EventSource.js">EventSource polyfill</a></li>
<li>Yaffle’s <a class="link-https" href="https://github.com/Yaffle/EventSource" title="https://github.com/Yaffle/EventSource">EventSource polyfill</a></li>
<li>Rick Waldron’s <a class="link-https" href="https://github.com/rwldrn/jquery.eventsource">jquery plugin</a></li>
</ul>
<h2 class="Related_Topics" id="Related_Topics" name="Related_Topics">Related Topics</h2>
<ul>
<li><a href="/en-US/docs/AJAX" title="AJAX">AJAX</a>, <a href="/en-US/docs/JavaScript" title="JavaScript">JavaScript</a>, <a href="/en-US/docs/WebSockets" title="WebSockets">WebSockets</a></li>
</ul>
</td>
</tr>
</tbody>
</table>
<h2 id="See_also">See also</h2>
<ul>
<li>A <a href="http://hacks.mozilla.org/2011/06/a-wall-powered-by-eventsource-and-server-sent-events/" title="http://hacks.mozilla.org/2011/06/a-wall-powered-by-eventsource-and-server-sent-events/">Twitter like application</a> powered by server-sent events and <a class="link-https" href="https://github.com/mozilla/webowonder-demos/tree/master/demos/friends%20timeline" title="https://github.com/mozilla/webowonder-demos/tree/master/demos/friends timeline">its code on Github</a>.</li>
<li><a href="http://dsheiko.com/weblog/html5-and-server-sent-events" title="http://dsheiko.com/weblog/html5-and-server-sent-events">HTML5 and Server-sent events</a></li>
<li><a href="http://rajudasa.blogspot.in/2012/05/html5-server-sent-events-using-aspnet.html" title="http://rajudasa.blogspot.in/2012/05/html5-server-sent-events-using-aspnet.html">Server-sent events using Asp.Net</a></li>
</ul>
<h2 id="Specification">Specification</h2>
<ul>
<li><a href="http://dev.w3.org/html5/eventsource/" title="http://dev.w3.org/html5/eventsource/">Server-sent events</a></li>
</ul>
<h2 id="Browser_compatibility">Browser compatibility</h2>
<div>
{{CompatibilityTable}}</div>
<div id="compat-desktop">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Chrome</th>
<th>Firefox (Gecko)</th>
<th>Internet Explorer</th>
<th>Opera</th>
<th>Safari</th>
</tr>
<tr>
<td>EventSource support</td>
<td>9</td>
<td>{{CompatGeckoDesktop("6.0")}}</td>
<td>{{CompatUnknown}}</td>
<td>11</td>
<td>5</td>
</tr>
</tbody>
</table>
</div>
<div id="compat-mobile">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Android</th>
<th>Firefox Mobile (Gecko)</th>
<th>IE Mobile</th>
<th>Opera Mobile</th>
<th>Safari Mobile</th>
</tr>
<tr>
<td>EventSource support</td>
<td>{{CompatUnknown}}</td>
<td>{{CompatUnknown}}</td>
<td>{{CompatUnknown}}</td>
<td>{{CompatUnknown}}</td>
<td>{{CompatUnknown}}</td>
</tr>
</tbody>
</table>
</div>
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