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If you had HTTPS_PROXY=https://some-valid-cert.example.com running a CONNECT proxy, we should've been able to do a TLS CONNECT request to e.g. controlplane.tailscale.com:443 through that, and I'm pretty sure it used to work, but refactorings and lack of integration tests made it regress. It probably regressed when we added the baked-in LetsEncrypt root cert validation fallback code, which was testing against the wrong hostname (the ultimate one, not the one which we were being asked to validate) Fixes #16222 Change-Id: If014e395f830e2f87f056f588edacad5c15e91bc Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>