server send push notification to client browser without using polling

Question

I am developing a web app in which I want that when some changes in database occurs, server sends response to particular client(like push notification). And I want this notification to be sent client's browser. I don't want to use polling.

What can I do? I think it's possible using SSE, but I am not clear.
I want to know

Is it possible to send response to particular client without client's request(without polling).
How server will detect that particular client?

please help me.

As you've said, SSE seems to be the way to go. What, more precisely, is not clear on the HTML5 example you link to? Also consider this 2013 Sinatra example: http://html5hacks.com/blog/2013/04/21/push-notifications-to-the-browser-with-server-sent-events/ and current proposed W3C recommendation: http://www.w3.org/TR/eventsource/ — Ciro Santilli Путлер Капут 六四事, Dec 10 '14 at 16:02
Possible duplicate of [Is there some way to PUSH data from web server to browser?](http://stackoverflow.com/questions/19995/is-there-some-way-to-push-data-from-web-server-to-browser) — Ciro Santilli Путлер Капут 六四事, Jan 06 '16 at 18:26

score 5 · Accepted Answer · answered Sep 10 '12 at 17:42

5

There is Web Notification. And there you can see the browsers that support it.

answered Sep 10 '12 at 17:42

Gros Lalo

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hey u know what i want actualy..? I want that types of news updates like facebook gives at the top-right side of the page.. Any idea how to do this without using polling..? – Rikin Thakkar Sep 11 '12 at 11:26
Well if you have a webserver and you want the notifications to come through while the app/site is running in your browser then you can use WebSocket. WebSocket does not require polling. So, when there is data available or, a change that you want to communicate to the connected browsers you can then push them. Do you know about WebSockets? – Gros Lalo Sep 11 '12 at 11:33
yaaa.. i know websockets but i want to know which is best option in my case websockets or SSE..? – Rikin Thakkar Sep 11 '12 at 12:06
It is hard to tell as your case it quite limited. If it is only about receiving notifications then both are equally valid in my opinion. I do not know much about the server side implementation for SSE but for web-socket it is quite easy even if you are building things from scratch. Also, if your case evolves then you should consider constraints such as, SSE is uni-directional while with web-sockets it is bi-directional. So, it depends as you can see. – Gros Lalo Sep 11 '12 at 13:40
No worries. Somehow i feel i did not do much to help :) – Gros Lalo Sep 12 '12 at 08:47
Mmmm, isn't Web Notifications for showing a popup outside of the browser? Can you give a working example of server to browser data push? – Ciro Santilli Путлер Капут 六四事 Dec 10 '14 at 15:40

server send push notification to client browser without using polling

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