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HTTPS and ICMP latency are fallbacks when STUN doesn't work. The lowest value wins. When ICMP doesn't work you just get HTTPS. HTTPS latency was way more variable than it needed to be as we were measuring "server processing time" (inclusive of TLS, HTTPS) instead of just TCP connect time. We don't need to perform an HTTPS request, we really just need a TCP ping, but aiming for a simpler change to start. Updates tailscale/corp#22114 Signed-off-by: Jordan Whited <jordan@tailscale.com>