=== HTTP code : 200 ===

Response headers
================
HTTP/1.1 301 Moved Permanently
cache-control: public, max-age=0, must-revalidate
content-length: 50
content-type: text/plain; charset=utf-8
date: Fri, 03 Dec 2021 09:22:39 GMT
server: Netlify
location: https://www.mozilla.org/ja/firefox/
x-nf-request-id: 01FNZWNJPXGZCZ75FZX0168T13
age: 3177

HTTP/1.1 200 OK
Content-Type: text/html; charset=utf-8
Content-Length: 81304
Connection: close
X-Frame-Options: DENY
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X-Clacks-Overhead: GNU Terry Pratchett
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Date: Fri, 03 Dec 2021 10:13:56 GMT
Cache-Control: max-age=600
Expires: Fri, 03 Dec 2021 10:22:47 GMT
ETag: &quot;469621b2e902b4aff8caf6b7342f40b5&quot;
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Age: 169

Request headers
================
HEAD /ja/firefox/ HTTP/1.1
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)
Host: www.mozilla.org
Accept: */*
Referer: http://web-marketing.zako.org
Connection: close


Link is valid.