I am trying to customize serving of some static resources with renderBinary(). 
I would like to serve these assets through controller which optionaly checks 
authorization and serves appropriate file. 
I would also like to cache some file for 1 year as they never change. 

The method in my controller looks something like this: 

```
    public static void item(String item) { 
             // check authorization ... 
             response.cacheFor("365d"); 
             renderBinary(Play.getFile("static/" + item)); 
    } 

```

The problem I am having is that play automatically adds Etag and 
caches it for 1 hour when using renderBinary, so the net effect is that
firefox re-issues request for these files again when needed, only to get 
304 response from play server. 

I know I can achieve thing with nginx as frontend but would like to do it
using only play.