[SOLVED]: Emtpy response from local www

I’m following these instructions to enable Chrome notifications. I created the Google project and downloaded the verification html file to my configuration folder / www. I restarted HA but I cannot retrieve the file, even from my own LAN.

Example:

https://my.ip:8123/local/google12345.html -> ERR_EMPTY_RESPONSE
https://my.ip:8123/google12345.html -> ERROR 404

How should I debug such a situation?

Fixed. I had to chown the file as homeassistant:homeassistant.