=== HTTP code : 200 ===

Response headers
================
HTTP/1.1 301 Moved Permanently
Server: Apache/2.2.3 (Red Hat)
Location: http://nationalgeographic.com/travel
Content-Type: text/html; charset=iso-8859-1
X-Cache-Lookup: MISS from django-rpc1.int.ngeo.com:80
Content-Length: 0
Date: Tue, 13 Feb 2018 18:00:28 GMT
Connection: close

HTTP/1.1 302 Moved Temporarily
Server: nginx/1.6.2
Date: Tue, 13 Feb 2018 18:00:28 GMT
Content-Type: text/html
Content-Length: 160
Connection: close
Location: http://www.nationalgeographic.com/travel

HTTP/1.1 301 Moved Permanently
Location: https://www.nationalgeographic.com/travel
Server: BigIP
Content-Length: 0
Date: Tue, 13 Feb 2018 18:00:28 GMT
Connection: close

HTTP/1.1 301 Moved Permanently
Server: Apache/2.2.3 (Red Hat)
Location: http://www.nationalgeographic.com/travel/
Content-Length: 341
Content-Type: text/html; charset=iso-8859-1
Date: Tue, 13 Feb 2018 18:00:28 GMT
Connection: close

HTTP/1.1 301 Moved Permanently
Location: https://www.nationalgeographic.com/travel/
Server: BigIP
Content-Length: 0
Date: Tue, 13 Feb 2018 18:00:28 GMT
Connection: close

HTTP/1.1 200 OK
Server: Apache/2.4.7 (Ubuntu) Communique/4.2.2
X-Frame-Options: SAMEORIGIN
Access-Control-Allow-Origin: *
Access-Control-Allow-Credentials: true
Content-Type: text/html
Cache-Control: max-age=182
Expires: Tue, 13 Feb 2018 18:03:30 GMT
Date: Tue, 13 Feb 2018 18:00:28 GMT
Connection: close

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