fix: prevent origin token from being forwarded upstream

snippets/proxy.conf.template

@@ -7,6 +7,7 @@ proxy_set_header Host              $host;
 proxy_set_header X-Real-IP         $remote_addr;
 proxy_set_header X-Forwarded-For   $proxy_add_x_forwarded_for;
 proxy_set_header X-Forwarded-Proto $scheme;
+proxy_set_header X-Origin-Token    '';
 
 # enable websockets: http://nginx.org/en/docs/http/websocket.html
 proxy_http_version 1.1;