On 2025-09-02, J Doe <[email protected]> wrote: > A side question - are IPv4/IPv6 addresses in the header only from bots > (ie: Host: 1.2.3.4) ? > > There aren't any human clients (web browsers), that use the numerical > form of the server address in the Host header are there ?
Web browsers will use the IP (and possibly port) in Host if entered as a URL. For example, open devtools (F12) so you can see request headers, then access a URL like https://8.8.8.8/ and you'll see it. (For https this requires having an IP address in the certificate to avoid TLS errors - this is possible with some CAs but is not all that common yet). -- Please keep replies on the mailing list.
