Environment

irrelevant

Version

v3.5.1

Reproduction

not possible to replicate service structure in stackblitz

Description

When running Nuxt development behind a reverse proxy like traefik, the client websocket's client URL does not necessarily match the websocket server URL. For instance, the reverse proxy can terminate SSL while Nuxt runs plain http, making the current websocket implementation offer ws: as protocol while it should be wss:.

The server can't know under which address it's offered to the client, so the client side needs to device whether to try wss or ws first, depending on the mode Nuxt is served to it. The same goes for the hostname.

Actually, vite's hmr server connection is constructed in a similar fashion, that's why it works right away in all contexts:

Additional context

I'll submit a PR right away: #3344

Actually, if anyone wants to test as setup with a reverse proxy, content.watch.hostname needs to be set to 0.0.0.0, but that's up to the user project to define, not in this module's source.

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