I have OwnCloud setup and it has a feature called External Site. It loads a site in an iframe, so you can stay in the websites shell. I have a page running on a reverse proxy. Is there anyway to only allow the OwnCloud page to access the reverse proxy while blocking any other connections to it? So in this situation, the OwnCloud site is publically accessible but I don't want the reverse proxy to be. On apache2, Ubuntu 14.04, own cloud 7