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