ACEGI: how to configure all pages with HTTPS but the home page?

I don't know if it's possible by configuring ACEGI: basically I want all the pages secured with authentication and HTTPS but I want to access the home page at http://localhost:80/roster and after being forced to log in see the page with HTTPS.

My settings are are the moment:

    httpPort = 80
    httpsPort = 443
    // Need to launch roster with 'grails run-app -https' the app is at 'https:/localhost:8443/roster'
    channelConfig = [secure: ['/**'], insecure: ['/login']]

but I can't get access to my home page at http://localhost/roster. I have to go to https://localhost/roster

Thanks

Fred