This plugin is useful e.g. if you have a wildcard SSL/TLS certificate for server but not for each site.
If the site is normally at say http://example.org/ and you want to have the admin area https protected, but you don’t have a SSL/TLS certificate so that https://example.org/ would work, you can define another domain for secure connections.
For example instead of https://example.org/wp-login.php or https://example.org/wp-admin/ the user is redirected to https://example.seravo.com/wp-login.php or https://example.seravo.com/wp-admin/.
This plugin works with both normal WordPress installations and WordPress Network installation and is compatible with the WordPress MU Domain Mapping plugin.
The code is optimized to be fast and does not for example do any database lookups or use cookies.
This plugin is made by Seravo Oy, which specializes in open source support services and among others is the only company in Finland to provide WordPress Premium Hosting.
Source available at https://github.com/Seravo/wp-https-domain-alias