TCP Keep-Alive on Linux - 10 seconds

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While browsing via HTTPS (TLSv1.2) for instance to https://www.theguardian.com. I see occurrences of keepalives from my host every 10 s, for every TCP stream.

I think you're right; it could be the HTTP keepalive directive on the webserver; I'll do some experiments with an Apache web server.

Thanks for pointing me in (what appears to be) the right direction.

HTTP keepalives and TCP keepalives are unrelated. See https://stackoverflow.com/questions/9334401/http-keep-alive-and-tcp-keep-alive for an explanation of the difference.