Pastebin

<Location /syncthing>
                RequestHeader append X-Deluge-Base "/syncthing/"
        </Location>

        ProxyPass /syncthing http://127.0.0.1:8080
        ProxyPassReverse /syncthing http://127.0.0.1:8080
        ProxyPassReverseCookieDomain 127.0.0.1 localhost
        ProxyPassReverseCookiePath / /syncthing/