=== HTTP code : 200 ===

Response headers
================
HTTP/1.1 200 OK
Date: Thu, 15 Feb 2018 19:06:32 GMT
Server: Apache/2.4.25 (Debian)
Last-Modified: Mon, 18 Dec 2017 11:49:03 GMT
ETag: &quot;3b2f6-5609befd0b3fa&quot;
Accept-Ranges: bytes
Content-Length: 242422
Connection: close
Content-Type: application/pdf

Request headers
================
HEAD /wp-content/uploads/2011/03/Carrefour.pdf HTTP/1.1
Host: 51.15.134.16
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.