Current File : //usr/share/doc/node-undici/api/WebSocket.md
# Class: WebSocket
> ⚠️ Warning: the WebSocket API is experimental.
Extends: [`EventTarget`](https://developer.mozilla.org/en-US/docs/Web/API/EventTarget)
The WebSocket object provides a way to manage a WebSocket connection to a server, allowing bidirectional communication. The API follows the [WebSocket spec](https://developer.mozilla.org/en-US/docs/Web/API/WebSocket) and [RFC 6455](https://datatracker.ietf.org/doc/html/rfc6455).
## `new WebSocket(url[, protocol])`
Arguments:
* **url** `URL | string` - The url's protocol *must* be `ws` or `wss`.
* **protocol** `string | string[] | WebSocketInit` (optional) - Subprotocol(s) to request the server use, or a [`Dispatcher`](./Dispatcher.md).
### Example:
This example will not work in browsers or other platforms that don't allow passing an object.
```mjs
import { WebSocket, ProxyAgent } from 'undici'
const proxyAgent = new ProxyAgent('my.proxy.server')
const ws = new WebSocket('wss://echo.websocket.events', {
dispatcher: proxyAgent,
protocols: ['echo', 'chat']
})
```
If you do not need a custom Dispatcher, it's recommended to use the following pattern:
```mjs
import { WebSocket } from 'undici'
const ws = new WebSocket('wss://echo.websocket.events', ['echo', 'chat'])
```
## Read More
- [MDN - WebSocket](https://developer.mozilla.org/en-US/docs/Web/API/WebSocket)
- [The WebSocket Specification](https://www.rfc-editor.org/rfc/rfc6455)
- [The WHATWG WebSocket Specification](https://websockets.spec.whatwg.org/)
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