I understand what you're saying is wrong, but I'm at a loss as to where this setting gets changed. I've not found it anywhere on any files of the server so I'm not sure where to go from here to fix this. Sorry to be so naive on this, but I dont' mess much with some of the backbone stuff unless it needs to be fixed, ... like this. If you can point me to the right location to change it I can do so without any issues, just no idea where to find it.
I've read over what you posted the link on, but although it shows "what" to put, I'm not familiar with HTTP headers other than the typicals meta, styles, scripts. If it goes in a script then I can do that I would think, just not sure where it goes. Sorry.