=== HTTP code : 200 ===

Response headers
================
HTTP/1.1 301 Moved Permanently
Content-Type: text/plain; charset=utf-8
Content-Length: 60
Connection: close
amo-request-id: cfa9f0ae-9965-484d-8462-1ff768a1a91c
Content-Security-Policy: default-src 'none';base-uri 'self';child-src 'none';connect-src https://www.google-analytics.com https://addons.mozilla.org;font-src https://addons.mozilla.org/static-frontend/;form-action 'self';frame-src 'none';img-src 'self' data: https://addons.mozilla.org/user-media/ https://addons.mozilla.org/static-frontend/ https://addons.mozilla.org/static-server/ https://addons.cdn.mozilla.net/;manifest-src 'none';media-src 'none';object-src 'none';script-src https://addons.mozilla.org/static-frontend/ https://www.google-analytics.com/analytics.js;style-src https://addons.mozilla.org/static-frontend/;worker-src 'none';report-uri /__cspreport__
Date: Fri, 03 Dec 2021 13:16:20 GMT
Location: /en-US/firefox/addon/4490/
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HTTP/1.1 301 Moved Permanently
Content-Type: text/plain; charset=utf-8
Content-Length: 65
Connection: close
amo-request-id: da0f6650-53f4-495c-b166-4bc034530f6a
Cache-Control: max-age=0
Cache-Control: s-maxage=180
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Date: Fri, 03 Dec 2021 13:16:21 GMT
Location: /en-US/firefox/addon/xnotifier/
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Strict-Transport-Security: max-age=31536000
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HTTP/1.1 200 OK
Content-Type: text/html; charset=utf-8
Content-Length: 151423
Connection: close
amo-request-id: 737d8104-cff9-4435-ae4e-f0afb1b0c8f4
Cache-Control: max-age=0
Cache-Control: s-maxage=180
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Date: Fri, 03 Dec 2021 13:16:21 GMT
ETag: W/&quot;24f7f-qnh1oAJdVXFqCIl/7CP+lWe9c/o&quot;
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Vary: Accept-Encoding,DNT,User-Agent,Accept-Encoding
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Request headers
================
HEAD /en-US/firefox/addon/xnotifier/ HTTP/1.1
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)
Host: addons.mozilla.org
Accept: */*
Referer: http://web-marketing.zako.org
Connection: close


Link is valid.