Found something! If I use https with the IP number and ignore the certificate errors caused by there being no certificate that matches the IP number, then I get a 200 OK (or presumably 404 as I've seen for some addresses).
sb@marquez:~$ curl -svk https://<server's IPv4 address>/ * Trying <server's IPv4 address>:443... * Connected to <server's IPv4 address> (<server's IPv4 address>) port 443 (#0) * ALPN: offers h2,http/1.1 * TLSv1.3 (OUT), TLS handshake, Client hello (1): * TLSv1.3 (IN), TLS handshake, Server hello (2): * TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8): * TLSv1.3 (IN), TLS handshake, Certificate (11): * TLSv1.3 (IN), TLS handshake, CERT verify (15): * TLSv1.3 (IN), TLS handshake, Finished (20): * TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1): * TLSv1.3 (OUT), TLS handshake, Finished (20): * SSL connection using TLSv1.3 / TLS_AES_256_GCM_SHA384 * ALPN: server accepted http/1.1 * Server certificate: * subject: CN=www.bang.priv.no * start date: Jul 3 23:25:10 2024 GMT * expire date: Oct 1 23:25:09 2024 GMT * issuer: C=US; O=Let's Encrypt; CN=R11 * SSL certificate verify result: unable to get local issuer certificate (20), continuing anyway. * using HTTP/1.1 > GET / HTTP/1.1 > Host: <server's IPv4 address> > User-Agent: curl/7.88.1 > Accept: */* > * TLSv1.3 (IN), TLS handshake, Newsession Ticket (4): * TLSv1.3 (IN), TLS handshake, Newsession Ticket (4): * old SSL session ID is stale, removing < HTTP/1.1 200 OK < Server: nginx/1.22.1 < Date: Sun, 25 Aug 2024 20:28:48 GMT < Content-Type: text/html < Content-Length: 864 < Last-Modified: Thu, 27 Aug 2020 16:54:00 GMT < Connection: keep-alive < ETag: "5f47e528-360" < Accept-Ranges: bytes < <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN"> <html> <head> <title>Familien Bangs eget web-domene</title> </head> <body> <h1>Familien Bangs eget web-domene</h1> <p>Jada. Hehe! Men hvis resten av familien vil ha noen linker herfra, s� m� de nok komme krypende til meg og sp�rre pent. Forel�pig er jeg den eneste her.</p> <ul> <li><a href="https://steinar.bang.priv.no">Steinar Bangs blogg</a></li> <li><a href="sb/"><em>Historiske sider for Steinar Bang (sider fra 1994-1999)</em></a></li> <li><a href="sb/pics/"><em>Bildearkiv fra 1990-tallet</em></a></li> <li><a href="https://oldalbum.bang.priv.no"><em>Ny versjon av bildearkiv fra 1990-tallet</em></a></li> </ul> <hr> <address> <a href="mailto:webmas...@bang.priv.no">webmas...@bang.priv.no</a> </address> </body> </html> * Connection #0 to host <server's IPv4 address> left intact sb@marquez:~$ _______________________________________________ nginx mailing list nginx@nginx.org https://mailman.nginx.org/mailman/listinfo/nginx