=== HTTP code : 200 ===

Response headers
================
HTTP/1.1 200 OK
Last-Modified: Wed, 09 Jan 2019 17:23:27 GMT
Content-Type: text/html; charset=utf-8
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Strict-Transport-Security: max-age=63072000; includeSubdomains; preload
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 0
X-Content-Type-Options: nosniff
Cache-Control: no-cache, must-revalidate
Expires: 0
Pragma: no-cache
X-Cloud-Trace-Context: 3a1fd2c0fc459da2094f944dbfbe286f
Content-Length: 42612
Date: Fri, 03 Dec 2021 07:15:49 GMT
Server: Google Frontend
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Connection: close

Request headers
================
HEAD /speed/pagespeed/module HTTP/1.1
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)
Host: developers.google.com
Accept: */*
Referer: http://web-marketing.zako.org
Connection: close


Link is valid.