twitter.comさんとx.comさんはサーバ証明書が同一なのがおもしろいよねえSafariさんとかだとTLS切らずにリダイレクトされそうだよねえ
$ :| openssl s_client -connect x.com:443 -servername x.com 2>/dev/null | openssl x509 -noout -serial
serial=04E1056104670BD06CDF33A38B67A431
$ :| openssl s_client -connect twitter.com:443 -servername twitter.com 2>/dev/null | openssl x509 -noout -serial
serial=04E1056104670BD06CDF33A38B67A431
って思ったらDNSが微妙に違うw
$ dig +short x.com
104.244.42.1
$ dig +short twitter.com
104.244.42.1
104.244.42.65
104.244.42.193
104.244.42.129
そういえばと思って調べてみたらやっぱり同居してるんだねえ!
$ :| openssl s_client -connect twitter.com:443 -showcerts 2>/dev/null | openssl x509 -noout -ext subjectAltName
X509v3 Subject Alternative Name:
DNS:*.twitter.com, DNS:twitter.com, DNS:*.x.com, DNS:x.com
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