http - `res.closed`

[ronag]

h2 compat has a great prop called closed which makes it easy to decide whether it is safe to call writeHead or not. I don't think there is anything corresponding in h1. Would be nice to have though?

You can use headersSent. However, that will not work in the case where the connection was closed before headers were sent. Maybe #15285 would be enough? Not sure?

[mscdex]

This is why having an updated .writable would have been nice to have.

[ronag]

@mscdex: Could closed be implemented as !this.writable || this.finished?

[mscdex]

No, you can't rely on .writable because of the revert I linked to (it's no longer updated to false).

[ronag]

@mscdex: Which is why I also added || this.finished which is set to true when writable should have been set to false?

[ronag]

closed property was removed.