=== HTTP code : 200 ===

Response headers
================
HTTP/1.1 200 OK
Date: Mon, 15 Apr 2019 20:59:22 GMT
Server: Apache/2
X-Powered-By: PHP/5.3.29
X-Pingback: http://www.backlinkchatluong.net/xmlrpc.php
Vary: User-Agent
Connection: close
Content-Type: text/html; charset=UTF-8

Request headers
================
HEAD /category/dich-vu-backlink-chat-luong/ HTTP/1.1
Host: www.backlinkchatluong.net
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.