We're using the ARR extension to IIS to rewrite requests to a website running a different app pool using the server farm feature.
I want to be able to set a custom header on the response when I generate my page inside the server farm, but it's getting stripped out as it comes through ARR.
I tried using the <serverVariables> functionality, but that only lets you add headers from the ARR routing website into the request as it goes into the website with the pages, not the other way around.