Insert Original HTTP_REFERER into Header iRule

Hello,

I need to get the HTTP_REFERER header inserted into an environment I have set up. The environment is set up as a reverse proxy with URI translation in both directions. The issue is this:

A request comes into test.server.com/test and is translated to test1.server.com/test. The HTTP_REFERER header shows test1.server.com instead of the original URL. Is there a way to change this?

Thanks!