If both of those internet sites are on TLS, the request to web-site B will contain the total URL from internet site A within the referer parameter of the ask for. And admin from internet site B can retrieve it from the log files of server B.)g. instance.com) will nevertheless be leaked on account of SNI. This has Definitely nothing to do with DNS p

@SteveJessop, please supply a connection to "Javascript hacks that allow for a completely unrelated web-site to check no matter whether a offered URL is within your background or not"You'll be able to not normally depend on privateness of the full URL possibly. As an illustration, as is usually the case on company networks, equipped equipment like