Probably best to file a support ticket to make this known to Mendix.
Thank you for the reply.
I update modeler to v7.12, but got the same result.
In Chrome and among other browsers, you cannot have HTTPS and HTTP requests mixed. Choose either one of them. Your best bet is tracing down where (in what file) the request is being made and simply change the URL from HTTP to HTTPS.
This is nothing related to Mendix, as I had these issues a lot of time as well when hand-coding simple static websites. That is works on localhost, but doesn't when on a live server is simply a default rule of your browser. Localhost is like "Meh, I don't care".
Please let me know if there was any solution found for this issue. We have similar issue in our Mendix app., which is being hosted in an on-prem environment.
Modeler version we are using is 7.16.