# 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>


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://pmsgz.gitbook.io/nectar/advanced/web-apis/server-sent-events.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.