=== HTTP code : 200 ===

Response headers
================
HTTP/1.1 200 OK
Date: Wed, 01 Dec 2021 16:19:04 GMT
Server: Apache/2.4.48 (Debian)
Last-Modified: Wed, 29 Jun 2011 05:34:10 GMT
ETag: &quot;10364-4a6d322437880&quot;
Accept-Ranges: bytes
Content-Length: 66404
Connection: close
Content-Type: image/jpeg

Request headers
================
HEAD /~carsonr/phd_thesis/figures/real-panopticon.jpg HTTP/1.1
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)
Host: alumni.media.mit.edu
Accept: */*
Referer: http://web-marketing.zako.org
Connection: close


Link is valid.