=== HTTP code : 200 ===

Response headers
================
HTTP/2 301 
location: https://developers.google.com/speed/pagespeed/insights/
content-type: text/html; charset=UTF-8
x-content-type-options: nosniff
date: Sat, 06 Apr 2019 04:25:49 GMT
expires: Mon, 06 May 2019 04:25:49 GMT
server: sffe
content-length: 252
x-xss-protection: 0
cache-control: public, max-age=2592000
age: 794853
alt-svc: quic=&quot;:443&quot;; ma=2592000; v=&quot;46,44,43,39&quot;

HTTP/2 200 
accept-ranges: none
vary: Accept-Encoding
content-type: text/html
date: Mon, 15 Apr 2019 09:13:22 GMT
expires: Mon, 15 Apr 2019 09:13:22 GMT
cache-control: private, max-age=1800
last-modified: Sun, 24 Mar 2019 23:15:00 GMT
x-content-type-options: nosniff
server: sffe
x-xss-protection: 0
alt-svc: quic=&quot;:443&quot;; ma=2592000; v=&quot;46,44,43,39&quot;

Request headers
================
HEAD /speed/pagespeed/insights/ HTTP/2
Host: developers.google.com
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)
Accept: */*
Referer: https://itxdesign.com
Connection: close


Link is valid.