=== HTTP code : 200 ===

Response headers
================
HTTP/1.1 200 OK
Server: Apache/2.2.3 (Red Hat)
Accept-Ranges: bytes
Content-Type: text/html; charset=UTF-8
X-Cache-Lookup: HIT from rpc4.int.ngeo.com:80
Content-Length: 56302
Cache-Control: max-age=2545
Expires: Tue, 13 Feb 2018 19:41:47 GMT
Date: Tue, 13 Feb 2018 18:59:22 GMT
Connection: close

Request headers
================
HEAD /2012/07/vanishing-languages/rymer-text HTTP/1.1
Host: ngm.nationalgeographic.com
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.