=== HTTP code : 200 ===

Response headers
================
HTTP/1.1 200 OK
Server: nginx
Date: Mon, 29 Nov 2021 06:15:36 GMT
Content-Type: text/html; charset=UTF-8
Content-Length: 12008
Connection: close
Status: 200 OK
X-Runtime: 0.00270
P3P: CP=&quot;NOI DEVa TAIa OUR BUS UNI&quot;
Set-Cookie: CHKIO=; domain=.diigo.com; path=/; expires=Thu, 25 Nov 2021 02:15:36 GMT; secure; SameSite=None
Set-Cookie: CHKIO=; domain=.diigo.com; path=/; expires=Thu, 25 Nov 2021 02:15:36 GMT; secure; SameSite=None
Set-Cookie: diigoandlogincookie=; domain=.diigo.com; path=/; expires=Thu, 25 Nov 2021 02:15:36 GMT; secure; SameSite=None
Set-Cookie: diigoandlogincookie=; domain=.diigo.com; path=/; expires=Thu, 25 Nov 2021 02:15:36 GMT; secure; SameSite=None
Set-Cookie: _smasher_session=c0e5d11d6b9dc0f51fab1cb8fb7af9c7; domain=diigo.com; path=/; secure; SameSite=None
ETag: &quot;8d2d4494c0b75a4df5397bcaf006135e&quot;
Cache-Control: private, max-age=0, must-revalidate

Request headers
================
HEAD / HTTP/1.1
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)
Host: www.diigo.com
Accept: */*
Referer: http://web-marketing.zako.org
Connection: close


Link is valid.