Server-sent events

Documentation

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 Events + data inside the web page.

Using server-sent events: A tutorial guide to writing both server and client side part of a server-sent events app.
EventSource reference: A reference to the client-side EventSource API.

Tools

Remy Sharp’s EventSource polyfill
Yaffle’s EventSource polyfill
Rick Waldron’s jquery plugin

Specification

Server-sent events

Browser compatibility

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

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Feature	Chrome	Firefox (Gecko)	Internet Explorer	Opera	Safari
EventSource support	9	6.0 (6.0)	?	11	5

Feature	Android	Firefox Mobile (Gecko)	IE Mobile	Opera Mobile	Safari Mobile
EventSource support	?	?	?	?	?