Trust proxy for HTTP/HTTPS forwarded protocol

Summary:
Allow the entry point to correctly print https://api... instead of http://api...
when publishing the list of available datasources.

Ref T1586.

Test Plan: Tested on api.nasqueron.org with change in Equatower

Reviewers: dereckson

Reviewed By: dereckson

Maniphest Tasks: T1586

Differential Revision: https://devcentral.nasqueron.org/D2190