Zack Tollman

When deploying a TLS enabled website, you must ensure that all content loaded on the site is loaded from secure origin. 
If your content is loaded from an insecure source, the security of your whole site is compromised and modern browsers 
will downgrade your website’s security rating.
The HTTPS Mixed Content Detector plugin attempts to identify sources of mixed content warnings. The plugin will examine 
content loaded from the site when admins are viewing the site. Any content that violates the policy of loading content 
that originates from “https:” resources will trigger an error and that resource will be logged. Viewing the log will 
allow you to examine the site for any warnings and remove them before they cause problems for your website.

HTTPS Mixed Content Detector

Super useful for sites transitioning to HTTPS

Detects and logs content that will cause mixed content warnings.

Otto Kekäläinen

Viljami Kuosmanen

Onni Hakala

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 <code>http://example.org/</code> and you want to have the admin area https protected, but you don’t have a SSL/TLS certificate so that <code>https://example.org/</code> would work, you can define another domain for secure connections.
For example instead of <code>https://example.org/wp-login.php</code> or <code>https://example.org/wp-admin/</code> the user is redirected to <code>https://example.seravo.com/wp-login.php</code> or <code>https://example.seravo.com/wp-admin/</code>.
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 <a href="https://seravo.com/" rel="nofollow ugc">Seravo Oy</a>, which specializes in open source support services and among others is the only company in Finland to provide <a href="https://seravo.com/" rel="nofollow ugc">WordPress Premium Hosting</a>.
Source available at https://github.com/Seravo/wp-https-domain-alias

HTTPS Domain Alias

Enable your site to have a different domains for HTTP and HTTPS.

HTTPS Mixed Content Detector vs HTTPS Domain Alias