=== HTTP code : 200 ===

Response headers
================
HTTP/1.1 200 OK
Content-Type: text/html; charset=utf-8
Cache-Control: no-cache, no-store, max-age=0, must-revalidate
Pragma: no-cache
Expires: Mon, 01 Jan 1990 00:00:00 GMT
Date: Mon, 29 Jul 2019 00:30:10 GMT
X-UA-Compatible: chrome=1
Content-Length: 231968
P3P: CP=&quot;This is not a P3P policy! See g.co/p3phelp for more info.&quot;
X-Content-Type-Options: nosniff
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 1; mode=block
Server: GSE
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Connection: close

Request headers
================
HEAD /a/ssdp.org/forum/?hl=en HTTP/1.1
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
Host: groups.google.com
Accept: */*
Referer: https://ssdp.org
Connection: close


Link is valid.