ポート疎通確認方法 - Qiita$ curl -I www.google.com:80 HTTP/1.1 200 OK Content-Type: text/html; charset=ISO-8859-1 P3P: CP="This is not a P3P policy! See g.co/p3phelp for more info." Date: Sun, 03 Oct 2021 09:24:04 GMT Server: gws X-XSS-Protection: 0 X-Frame-Options: SAMEORIGIN Transfer-Encoding: chunked Expires: Sun, 03 Oct 2021 09:24:04 GMT Cache-Control: private Set-Cookie: 1P_JAR=2021-10-03-09; expires=Tue, 02-Nov-2021
What is StartTLS? How it works, uses, and security risks
