possible to configure something like x-server-raw-request ?

I see that `x-server-raw-response` is available to expose the underlying to users, allowing deeper customization of response.

I was wondering if it's possible to expose a similar interface for request as well? So that we can utilize some predefined functions by `akka-http`. For example, `extractClientIP`.

Not a huge deal and is blocking anything, since we can simply replicate all these functions, but would be a helpful feature to have :)