https://gitlab.com/gitlab-org/omnibus-gitlab/blob/master/doc/settings/nginx.md#supporting-proxied-ssl http://stackoverflow.com/questions/16042647/whats-the-de-facto-standard-for-a-reverse-proxy-to-tell-the-backend-ssl-is-used
https://gitlab.com/gitlab-org/omnibus-gitlab/blob/master/doc/settings/nginx.md#supporting-proxied-ssl http://stackoverflow.com/questions/16042647/whats-the-de-facto-standard-for-a-reverse-proxy-to-tell-the-backend-ssl-is-used