Use HTTPS url for fetching index.php instead of HTTP url
Use HTTPS url for fetching index.php instead of HTTP url

The HTTP resource results in a redirect to the HTTPS url, so we can save one request this way.
We should use HTTPS anyway (like already done for api.php).

Lodifice/mfnf-pdf-export,Lodifice/mfnf-pdf-export,Lodifice/mfnf-pdf-export