How to check if a site is being parsed or copied?

Question

1C-Bitrix

Good afternoon!
Tell me, there are two sites that work on different domains, both sites are identical, it is worth deleting or writing something on the original site or on a copy, as soon as these changes appear on another site.
Repeats completely the structure of the site of the original, checked the DNS specified by others.
A test was made on the load of the site, a copy of the site hung, the original did not.
Even system updates are installed at the same time as on a copy of the site, it feels like you are working with one site, it's just on different domains
. What kind of joke can it be?

Answer 1

This is something like a proxy, in the simplest version, even without caching. Those. every time someone visits the clone site, data is requested from the original site.
To identify, you can contact the clone to a fictitious url and look in the apache / nginx logs of your site who will try to visit you at the same fictitious url.
Ban with standard errors can be bypassed automatically through a proxy.
A common practice for dealing with a clone is to give it some kind of nonsense instead of content. Just need to carefully calculate its IP, so as not to give nonsense to search engines.