=== HTTP code : 200 ===

Response headers
================
HTTP/1.1 200 OK
Server: nginx
Date: Sat, 10 May 2025 02:07:08 GMT
Content-Type: application/pdf
Content-Length: 879935
Connection: close
Last-Modified: Fri, 05 Jul 2024 09:36:12 GMT
ETag: &quot;6687be8c-d6d3f&quot;
Cache-Control: public, max-age=31536000
Vary: Accept-Encoding
Access-Control-Allow-Origin: *
Accept-Ranges: bytes

Request headers
================
HEAD /wp-content/uploads/2016/01/BI476.pdf HTTP/1.1
Host: insulationinstitute.org
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.5112.34 Safari/537.36
Accept: */*
Referer: https://greenmanual.rutgers.edu
Connection: close


Link is valid.