=== HTTP code : 200 ===

Response headers
================
HTTP/1.1 301 Moved Permanently
Server: nginx
Date: Fri, 03 Dec 2021 05:18:32 GMT
Content-Type: text/html
Content-Length: 162
Connection: close
Location: https://u-site.jp/alertbox/20060417_reading_pattern.html

HTTP/1.1 301 Moved Permanently
Server: nginx
Date: Fri, 03 Dec 2021 05:18:32 GMT
Content-Type: text/html; charset=UTF-8
Connection: close
Expires: Fri, 03 Dec 2021 06:18:32 GMT
Cache-Control: max-age=3600
X-Redirect-By: redirection
Location: /alertbox/20060417_reading_pattern

HTTP/1.1 200 OK
Server: nginx
Date: Fri, 03 Dec 2021 05:18:33 GMT
Content-Type: text/html; charset=UTF-8
Connection: close
Link: &lt;https://u-site.jp/?p=217&gt;; rel=shortlink

Request headers
================
HEAD /alertbox/20060417_reading_pattern HTTP/1.1
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)
Host: u-site.jp
Accept: */*
Referer: http://web-marketing.zako.org
Connection: close


Link is valid.