At first glance Eloog it looks cryptic language to me. I do not believe the server is doing this. I need more info, is this your site? does this language reside in your source code? what server does it reside on?
This is only speculation just going by what I see. I see a scraped site originating from a Chinese server. All Internet related suff originating from China is a very dangerous thing. The holes in their grid is enormous. Half the time China has no internet service. People from China are constantly scraping sites and are very tough to stop.
It looks intially like Html but is definately some other programming language involved here. The two languages can be mixed in this format, But for me it looks also like a malicious hack language.
This only speculation In need more info. Greek39