=== HTTP code : 200 ===

Response headers
================
HTTP/1.1 301 Moved Permanently
Date: Tue, 13 Feb 2018 18:59:33 GMT
Location: http://ec.europa.eu/commfrontoffice/publicopinion/flash/fl_313_en.pdf
Server: Europa
Connection: close

HTTP/1.1 200 OK
Date: Tue, 13 Feb 2018 18:59:33 GMT
Last-Modified: Thu, 30 Nov 2017 11:24:01 GMT
ETag: &quot;39edce-55f317d2f16bc&quot;
Accept-Ranges: bytes
Content-Length: 3796430
Content-Type: application/pdf
Server: Europa
Connection: close

Request headers
================
HEAD /commfrontoffice/publicopinion/flash/fl_313_en.pdf HTTP/1.1
Host: ec.europa.eu
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.