Add the remote_user header again.

templates/nginx.default.conf.j2

@@ -41,6 +41,8 @@ server {
     proxy_set_header X-Forwarded-Port $server_port;
     proxy_set_header X-Forwarded-Proto $scheme;
     proxy_set_header X-Original-URI $request_uri;
+    proxy_set_header Authorization "Bearer $auth_token";
+    proxy_set_header remote_user "$remote_user";
     proxy_pass http://_inception-server;
   }