To be clear, this is for http/2, not tcp. You can very easily set read and write deadlines on tcp conns, but you can’t detect if a peer has disappeared without

To be clear, this is for http/2, not tcp. You can very easily set read and write deadlines on tcp conns, but you can’t detect if a peer has disappeared without data. You can set keepalive but it’s not reliable and varies wildly between OSs. You need a heartbeat or ping message together with an advancing deadline to detect dead peers reliably.