Websocket do not work with `app.baseURL` in dev.

[tmg0]

Description

When I add the app.baseURL config in nuxt.config.ts and run the dev script local, the page would be infinity refresh, and if I remove this config It works well.

It seems like websocket and baseURL config caused a HMR error ( I am not quite sure about that )

I forked a repo of this project and reproduced that problem.

Logs

client.ts:77 WebSocket connection to 'ws://localhost:3000/_prefix/_nuxt/' failed: Invalid frame header