Steps to Reproduce

1. Setup a Cloud VPS with a Proxy.
2. Inspect the request headers from the instance

Actual Results
There is an X-Forwarded-Proto but no X-Forwarded-For. The lack of X-Forwarded-For means that the IP address recorded for edits in MediaWiki is that of the proxy, not of the user who made the request.

Expected Results
An X-Forwarded-For header containing the user's public IP address