=== HTTP code : 200 ===

Response headers
================
HTTP/2 200 
server: nginx
date: Sun, 14 Apr 2019 04:12:05 GMT
content-type: text/html; charset=UTF-8
vary: Accept-Encoding
x-content-type-options: nosniff
vary: Accept-Encoding, Cookie
expires: Thu, 01 Jan 1970 00:00:00 GMT
cache-control: private, must-revalidate, max-age=0
last-modified: Mon, 04 Mar 2019 20:38:31 GMT
content-language: en
strict-transport-security: max-age=31536000

Request headers
================
HEAD /Theme_Unit_Test HTTP/2
Host: codex.wordpress.org
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.