# Webpack hot reload (HMR) behind a reverse proxy

When using Webpack behind a reverse proxy like LocalCan, you will need to add this code to the `webpack.config.js` file in order to use hot reloads (HMR) which work through a WebSocket connection.

```js:webpack.config.js
...
allowedHosts: 'all',
client: {
	...
	webSocketURL: 'auto://0.0.0.0:0/ws',
},
```

After adding these, WebSocket connection will be established successfully on both http (ws) and https (wss) connections.