Is there any way to force https:// to be used for assets and still be able to define a theme CSS files in its .info file?
Solutions
You might need to set the base URL in the settings.php file, specifying the URL scheme.
$base_url = 'https://my.domain.name';
For a Drupal 7 site using Cloudflare CDN and a Bootstrap theme, this worked for me: Set the base URL in your settings.php file, without including http:// or https://.
$base_url = '//my.domain.name';
For another Drupal 7 site with a different theme, just removing $base_url worked.
In both cases, I needed the site to work with secure URLs and without.
One option is to use AdvAgg as this will generate different aggregate filenames for http and https. If the issue is the cache then advagg will not fix it though.
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