> For the complete documentation index, see [llms.txt](https://pmsgz.gitbook.io/nectar/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://pmsgz.gitbook.io/nectar/advanced/web-apis/server-sent-events.md).

# Server-Sent Events API

## Overview

Server-Sent Events API allows web apps to receive a stream of updates from a server over a HTTP connection without resorting to polling.

Unlike WebSockets, Server-Sent Events are a one-way communication channel, ie, the messages flow from server to client only.

Server-Sent Events API can be useful when you have some rapidly updating data to display, but you don't want to poll the server, for example, stock price ticker, scorecard, or live updates.

## Demo

<https://nectar.website/demo/web-apis/server-sent-events/>

## Usage

You can refer to the code present in `/partials/web-apis/server-sent-events.html` file and use it accordingly.

The PHP file which serves the live data is located at `/assets/custom/php/server-sent-events.php`.

## Reference

<https://developer.mozilla.org/en-US/docs/Web/API/Server-sent_events/Using_server-sent_events>