=== HTTP code : 200 ===

Response headers
================
HTTP/2 301 
x-xss-protection: 0
content-language: en
x-content-type-options: nosniff
strict-transport-security: max-age=31536000; includeSubdomains
vary: Accept-Language
location: https://developers.google.com/speed/
x-frame-options: SAMEORIGIN
content-type: text/html; charset=utf-8
x-cloud-trace-context: 7a7b8318d5ede41f0db34919e377575a
date: Tue, 16 Apr 2019 05:13:07 GMT
server: Google Frontend
alt-svc: quic=&quot;:443&quot;; ma=2592000; v=&quot;46,44,43,39&quot;

HTTP/2 200 
strict-transport-security: max-age=31536000; includeSubdomains
x-content-type-options: nosniff
content-language: en
expires: Tue, 16 Apr 2019 06:13:07 GMT
vary: Accept-Language
last-modified: Fri, 22 Jun 2018 02:05:18 GMT
x-xss-protection: 0
cache-control: public, must-revalidate, max-age=3600
x-frame-options: SAMEORIGIN
content-type: text/html; charset=utf-8
x-cloud-trace-context: 50964b3f7a077ac16dbba3ef99f39e42
date: Tue, 16 Apr 2019 05:13:07 GMT
server: Google Frontend
alt-svc: quic=&quot;:443&quot;; ma=2592000; v=&quot;46,44,43,39&quot;

Request headers
================
HEAD /speed/ 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.