=== HTTP code : 200 ===

Response headers
================
HTTP/1.1 200 OK
Content-Type: text/html
X-Content-Type-Options: nosniff
X-Frame-Options: SAMEORIGIN
X-Frontend-Version: patent-search.search_20190724_RC01
X-Xss-Protection: 0
Date: Wed, 07 Aug 2019 03:56:23 GMT
Alt-Svc: quic=&quot;:443&quot;; ma=2592000; v=&quot;46,43,39&quot;
Connection: close

Request headers
================
HEAD /patent/US9872989B2/en?oq=US9872989 HTTP/1.1
Host: patents.google.com
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36
Accept: */*
Referer: https://bme.fiu.edu
Connection: close


Link is valid.