Sadly, though:

    $ curl -I https://www.nsf.gov/pubs/1998/nsf9814/nsf9814.htm
    HTTP/2 404 
    content-type: text/html; charset=UTF-8
    content-length: 54737
    date: Sun, 09 Aug 2026 17:58:44 GMT
    strict-transport-security: max-age=31536000; includeSubdomains; preload
    server: Apache