Improve security score at Mozilla Observatory
https://observatory.mozilla.org/analyze.html?host=ogptoolbox.org
Scan summary: F
Recommended Change
Fantastic work using HTTPS! Did you know that you can ensure users never visit your site over HTTP accidentally?
HTTP Strict Transport Security tells web browsers to only access your site over HTTPS in the future, even if the user attempts to visit over HTTP or clicks an http:// link.