cloud foundry is providing same instance of my web page to every device

Lets say there is some static variables in a class and when user on device 1 store some data on it and at the same time some other user on device 2 open the web page the he/she gets the same data store in that variable. I think cloud Foundry provide different isolated environment to every user that goes on the website. Please do tell if this behavior what cloud foundry really provide or i am missing something .