the plugin is great, well done.
However there is one annoying thing:
The plugin uses autoloading without checking for class namespace. The include() in wphttps_autoloader is even called for other plugins with their own class loaders.
This is generating a lot of warnings of failed include's in the log, which is not good for site performance.
You should check for your class namespaces before trying to include them in wphttps_autoloader().