Nginx with X-Forwarded-Proto set for SSL

gistfile1.pl

server {
  listen 1.2.3.4:443;
  server_name railsapp.example.com;
  ssl on;
  ssl_certificate cert.pem;
  ssl_certificate_key cert.key;
  location / {
    proxy_set_header X-Forwarded-Proto https;
    # Sets the HTTP headers appropiately;
    proxy_pass  http://rails_application;
  }
}

proxy_set_header X-Forwarded-Proto https;
proxy_set_header X-Forwarded-Scheme https;