Could be a number of ways for example a default TLS cert, or a default vhost redirect. I actually had a job once a few years ago where I was asked to hide a we

Could be a number of ways for example a default TLS cert, or a default vhost redirect. I actually had a job once a few years ago where I was asked to hide a web service from crawlers and so I did some of these things to ensure no info leaked about the real vhost.