If Pi-Hole is behind a reverse proxy that uses SSL, then the block page will not load resources such as `blockingpage.css` and `jquery.min.js` as the insecure `http://` is hard coded. Browsers will block attempts to load insecure resources if the page is loaded of SSL.
The fix is acheived by checking `$_SERVER['HTTPS']` and setting the variable `$proto` to either `http` or `https`. The harcoded `http` is replaced by the contents of this variable.
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