=== HTTP code : 200 ===

Response headers
================
HTTP/1.1 301 Moved Permanently
Content-Type: text/html; charset=utf-8
Location: https://modpagespeed.com/doc/faq
Cache-Control: no-cache, must-revalidate
Pragma: no-cache
Set-Cookie: _ga_devsite=GA1.3.551164646.1638519514; Expires=Sun, 03-Dec-2023 08:18:34 GMT; Max-Age=63072000; Path=/
Content-Security-Policy: base-uri 'self'; object-src 'none'; script-src 'strict-dynamic' 'unsafe-inline' https: http: 'nonce-OXa9iho+5ltKQi80cufWLJosAFZ2wW' 'unsafe-eval'; report-uri https://csp.withgoogle.com/csp/devsite/v2
Strict-Transport-Security: max-age=63072000; includeSubdomains; preload
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 0
X-Content-Type-Options: nosniff
Expires: Fri, 01 Jan 1990 00:00:00 GMT
X-Cloud-Trace-Context: d0c35003d992cb4f010d6ae4f2402761
Content-Length: 271
Date: Fri, 03 Dec 2021 08:18:34 GMT
Server: Google Frontend
Alt-Svc: h3=&quot;:443&quot;; ma=2592000,h3-29=&quot;:443&quot;; ma=2592000,h3-Q050=&quot;:443&quot;; ma=2592000,h3-Q046=&quot;:443&quot;; ma=2592000,h3-Q043=&quot;:443&quot;; ma=2592000,quic=&quot;:443&quot;; ma=2592000; v=&quot;46,43&quot;
Connection: close

HTTP/1.1 301 Moved Permanently
Date: Fri, 03 Dec 2021 08:18:35 GMT
Server: Apache/2.4.29 (Ubuntu)
Location: https://www.modpagespeed.com/doc/faq
Connection: close
Content-Type: text/html; charset=iso-8859-1

HTTP/1.1 200 OK
Date: Fri, 03 Dec 2021 08:18:37 GMT
Server: Apache/2.4.29 (Ubuntu)
Accept-Ranges: bytes
X-Mod-Pagespeed: 1.14.36.1-0
Vary: Accept-Encoding
Cache-Control: max-age=0, no-cache
Content-Length: 40431
Connection: close
Content-Type: text/html

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


Link is valid.