=== HTTP code : 200 ===

Response headers
================
HTTP/1.1 200 OK
Server: Apache
Expires: Tue, 13 Feb 2018 09:51:46 GMT
Cache-Control: max-age=300
Pragma: public
Last-Modified: Tue, 24 Sep 2013 11:48:53 GMT
ETag: &quot;a28321200ef03168f61b4fd82b683e4f&quot;
Vary: Accept-Encoding
Content-Type: text/html;charset=utf-8
Date: Tue, 13 Feb 2018 09:46:47 GMT
X-Varnish: 1330945209
Connection: close
X-Cache: Miss

Request headers
================
HEAD /new/en/culture/themes/endangered-languages/biodiversity-and-linguistic-diversity/ HTTP/1.1
Host: www.unesco.org
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)
Accept: */*
Referer: http://51.15.134.16
Connection: close


Link is valid.