Insecure endpoint

Nothing. However it seems that there are links on your page (template or other plugin related) that are causing the mismatch of request types. I would suggest looking at the source code on the page after it renders to search for “https://” and see what media assets are being forced to load over a non-https (non-ssl) connection and causing that error for you. This plugin only provides a redirect mechanism there are no external linking of assets thus this error is not caused by the use of this plugin.