=== HTTP code : 200 ===

Response headers
================
HTTP/2 200 
strict-transport-security: max-age=31536000; includeSubDomains; preload
referrer-policy: origin-when-cross-origin
content-security-policy: upgrade-insecure-requests
date: Sat, 10 May 2025 04:16:54 GMT
server: Apache
cache-control: private
ncbi-phid: CE8EE11C81ED0771000000000087006D.m_12
ncbi-sid: CE8EE11C81ED3361_0135SID
content-type: text/html; charset=UTF-8
set-cookie: ncbi_sid=CE8EE11C81ED3361_0135SID; domain=.nih.gov; path=/; expires=Sun, 10 May 2026 04:16:54 GMT; secure; HttpOnly
set-cookie: WebEnv=1pIU6U%40CE8EE11C81ED3361_0135SID; domain=.nlm.nih.gov; path=/; expires=Sat, 10 May 2025 12:16:54 GMT; secure; HttpOnly
set-cookie: books.article.report=; domain=.nih.gov; path=/; Max-Age=31536000; secure; HttpOnly
x-ua-compatible: IE=Edge
x-xss-protection: 1; mode=block

Request headers
================
HEAD /books/NBK425844/ HTTP/2
Host: www.ncbi.nlm.nih.gov
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.