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.
| Specification | Status | Comment |
|---|---|---|
| Server-Sent Events | Recommendation | Initial definition. |
| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| EventSource support | 6 | No support | 6.0 (6.0) [1] | No support | 9 [2] | 5 |
| Feature | Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|
| EventSource support | 4.4 | 45 | ? | 12 | 4.1 |
[1] Firefox currently does not support EventSource in web/shared workers. and prior to version 36 server-sent events do not reconnect automatically in case of a connection interrupt.
[2] Opera 9 partial supports Server-sent Events.
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https://developer.mozilla.org/en-US/docs/Web/API/Server-sent_events