Add IP forwarding headers to nginx config (fixes #1318)

ansible/templates/nginx.conf

@@ -67,6 +67,11 @@ server {
       proxy_pass $proxpass;
 
       rewrite ^(.+)/+$ $1 permanent;
+
+      # Send actual client IP upstream
+      proxy_set_header X-Real-IP $remote_addr;
+      proxy_set_header Host $host;
+      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
     }
 
     # backend