=== HTTP code : 200 ===

Response headers
================
HTTP/1.0 301 Moved Permanently
Date: Sun, 23 Sep 2018 05:50:02 GMT
Server: Apache
Referrer-Policy: origin-when-cross-origin
Location: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2408621/
Connection: close
Content-Type: text/html; charset=iso-8859-1

HTTP/1.0 200 OK
Date: Sun, 23 Sep 2018 05:50:02 GMT
Server: Apache
Strict-Transport-Security: max-age=31536000; includeSubDomains; preload
Referrer-Policy: origin-when-cross-origin
Content-Security-Policy: upgrade-insecure-requests
Cache-Control: private
NCBI-PHID: 8A1A7176BA7293010000000000290021.m_9
NCBI-SID: 8A1A7176BA7298A1_0041SID
Content-Type: text/html; charset=UTF-8
Set-Cookie: ncbi_sid=8A1A7176BA7298A1_0041SID; domain=.nih.gov; path=/; expires=Mon, 23 Sep 2019 05:50:02 GMT
Set-Cookie: WebEnv=1hUM_5%408A1A7176BA7298A1_0041SID; domain=.nlm.nih.gov; path=/; expires=Sun, 23 Sep 2018 13:50:03 GMT
Set-Cookie: pmc.article.report=; domain=.nih.gov; path=/; Max-Age=31536000
X-UA-Compatible: IE=Edge
X-XSS-Protection: 1; mode=block
Connection: close

Request headers
================
HEAD /pmc/articles/PMC2408621/ HTTP/1.0
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)
Host: www.ncbi.nlm.nih.gov
Accept: */*
Referer: http://sothisisfitness.com
Connection: close


Link is valid.