=== HTTP code : 200 ===

Response headers
================
HTTP/1.1 200 OK
date: Wed, 24 Nov 2021 08:44:16 GMT
server: Apache/2.4.51 (Debian)
cache-control: max-age=604800
expires: Wed, 01 Dec 2021 08:44:16 GMT
vary: Accept-Encoding
content-type: text/html; charset=utf-8
accept-ranges: bytes
content-length: 27142
connection: close

Request headers
================
HEAD / HTTP/1.1
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)
Host: validator.w3.org
Accept: */*
Referer: http://web-marketing.zako.org
Connection: close


Link is valid.