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---
name: Upgrade an HTTP request to a WebSocket connection
---
Inside `fetch`, use the `server.upgrade()` function to upgrade an incoming `Request` to a WebSocket connection. Bun automatically returns a 101 Switching Protocols response if the upgrade succeeds.
Refer to the [WebSocket docs](/docs/api/websockets) for more information on building WebSocket servers.
```ts
const server = Bun.serve<{ authToken: string }>({
fetch(req, server) {
const success = server.upgrade(req);
if (success) {
// Bun automatically returns a 101 Switching Protocols
// if the upgrade succeeds
return undefined;
}
// handle HTTP request normally
return new Response("Hello world!");
},
websocket: {
// define websocket handlers
},
});
console.log(`Listening on localhost:\${server.port}`);
```
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