How to distinguish between headers of proxied response to those of the original response object

[eladbs]

Hi,

Is there a way in the userResHeaderDecorator to distinguish between headers of the proxied response to those of the original response object?
Is there a way to make sure that some headers are not overriding those in the original response?

For i.e. let's say I have CORS module enabled on the route - it will put the header access-control-allow-origin in the response object.
if the underlying service I proxy my request to will put the same header as well, it will override the original one.

Is it possible to distinguish somehow? exclude header from proxied response?

Thanks!
Elad.