Now a days website without https is not good. To force your website to open only via https protocol add below code in your .htaccess file
RewriteEngine On
#force https
RewriteCond %{HTTPS} off
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
There are some situations when you need to refresh the iframe.
So in that case you just need to touch the iframe src attribute & it will relaod the iframe.
Code:
document.getElementById('i_frame').src = document.getElementById('i_frame').src;
This code will also help you in a situations where browser stores iframe in cache, with this method you can avoid iframe loading from cache.