Server-sent events

The EventSource API creates a connection to a server and listens to a stream of events sent by the server. To learn more, see EventSource, EventSource: EventSource() constructor, EventSource: close() method, EventSource: error event, EventSource: message event, EventSource: open event, EventSource: readyState property, EventSource: url property, EventSource: withCredentials property at MDN.

Compatibility (view on caniuse.com)

• Chrome 6 Released on 2010-09-02
• Chrome Android 18 Released on 2012-06-27
• Edge 79 Released on 2020-01-15
• Firefox 6 Released on 2011-08-16
• Firefox for Android 45 Released on 2016-03-08
• Safari 5 Released on 2010-06-07
• Safari on iOS 5 Released on 2011-10-12