=== HTTP code : 200 ===

Response headers
================
HTTP/1.1 200 OK
Date: Sun, 23 Sep 2018 15:50:12 GMT
Server: Apache
Last-Modified: Sat, 06 Aug 2016 02:22:37 GMT
ETag: &quot;831a0-2ad52-5395ddb449540&quot;
Accept-Ranges: bytes
Content-Length: 175442
Connection: close
Content-Type: application/pdf
Set-Cookie: visid_incap_48399=hCoK+PKhRcKmqfkMsbl3UfK1p1sAAAAAQUIPAAAAAAAhz4H1iQWKANQqv6kG4KgM; expires=Mon, 23 Sep 2019 13:32:05 GMT; path=/; Domain=.puroast.com
Set-Cookie: incap_ses_444_48399=OjWwBLCaFUwOd6uSuGgpBjO2p1sAAAAAIcG4h3iOGrgbs4HeBoQfDw==; path=/; Domain=.puroast.com
X-Iinfo: 9-54189807-54189808 NNNN CT(40 -1 0) RT(1537717811289 0) q(0 0 1 0) r(1 1) U6
X-CDN: Incapsula

Request headers
================
HEAD /papers/LowAcidResearchAbstract.pdf HTTP/1.1
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)
Host: www.puroast.com
Accept: */*
Referer: http://sothisisfitness.com
Connection: close


Link is valid.