* Use a specialized ResponseWriter in middleware
* Track User & Upstream in RequestScope
* Wrap responses in our custom ResponseWriter
* Add tests for logging middleware
* Inject upstream metadata into request scope
* Use custom ResponseWriter only in logging middleware
* Assume RequestScope is never nil
Moves the logic for redirecting to HTTPs to a middleware package and adds tests for this logic.
Also makes the functionality more useful, previously it always redirected to the HTTPS address of the proxy, which may not have been intended, now it will redirect based on if a port is provided in the URL (assume public facing 80 to 443 or 4180 to 8443 for example)
