feature: EventSource (Server-Sent Events) status: use tags: polyfill kind: api polyfillurls:EventSource polyfill
Server-sent events are real-time events emitted by the server and received by the browser. The main difference to WebSockets is that server-sent events work over regular HTTP and can therefore be replicated entirely using JavaScript.
EventSource isn’t available in any version of Internet Explorer and still under consideration for Edge.
See MDN web docs for more details.