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Just because we get an HTTP upgrade response over port 80, don't assume we'll be able to do bi-di Noise over it. There might be a MITM corp proxy or anti-virus/firewall interfering. Do a bit more work to validate the connection before proceeding to give up on the TLS port 443 dial. Updates #4557 (probably fixes) Change-Id: I0e1bcc195af21ad3d360ffe79daead730dfd86f1 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>