I have a server running mod_proxy and I need to essentially rename a request header. A proxy closer to the origin is stripping off the X-Forwarded-For header, but we need that data to persist, so I want to add the value to a different header to allow the origin to pick it up.
From my reading of the doco there is no way to rename a header and I can't see how to pass in values into RequestHeader add in mod_headers.