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I ran into a similar phantom-traffic problem from Go ignoring the Linux default for TCP keepalives and sending them every 15 seconds, very wasteful for mobile devices. While I quite like the rest of Go, I don't see why they have to be so opinionated and ignore the OS in their network defaults.

My PR fixing that in Caddy: https://github.com/caddyserver/caddy/pull/4865

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To be fair, the linux defaults of 2h are not working in most enterprise or cloud environments. One frequently encounter load balancers, firewalls and other proxies that drop connections after around 5-15 minutes. 15 seconds sounds very aggressive though.

The default of 2h is not just a Linux default; it's straight up from the RFC.

https://www.rfc-editor.org/rfc/rfc9293.html#name-tcp-keep-al...

> Keep-alive packets MUST only be sent when no sent data is outstanding, and no data or acknowledgment packets have been received for the connection within an interval (MUST-26). This interval MUST be configurable (MUST-27) and MUST default to no less than two hours (MUST-28).

Thanks for that PR!! We greatly appreciate it.

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