Standalone server not using https in package feed

[parnham]

We are testing out the standalone server and have it behind a basic auth nginx proxy configured as follows:

   proxy_set_header X-Real-IP $remote_addr;
   proxy_set_header Host $http_host;
   proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
   proxy_set_header X-Forwarded-Proto https;
   proxy_pass http://127.0.0.1:8888;

The package feed contains the correct server name and path throughout the XML but all of the URLs are http and not https which means the packages will not download via the nuget plugin.