http - document upgrade error handling

[ronag]

Looking at https://nodejs.org/api/http.html#http_event_upgrade and https://nodejs.org/api/http.html#http_event_upgrade_1 it's unclear whether I have to listen to both res.on('error', ...) and socket.on('error', ...).

Is there any overlap between them? i.e. can an error be emitted to both, are there errors that are not emitted by both? A little bit of set theory.

[lpinca]

The tcp socket is freed when the 'upgrade' event is emitted. Errors are only emitted to the socket instance.

[lpinca]

@ronag is your question answered? Can this be closed?