=== HTTP code : 200 ===

Response headers
================
HTTP/1.1 200 OK
Server: nginx
Date: Mon, 15 Apr 2019 22:10:00 GMT
Content-Type: text/html
Connection: close
X-FRAME-OPTIONS: SAMEORIGIN
P3P: CP=&quot;CAO PSA OUR&quot;
Set-Cookie: sid=c75ea4ef8c74dc87edb450564dd7d3a6; path=/
Vary: Accept-Encoding

Request headers
================
HEAD / HTTP/1.1
Host: www.rgbstock.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.