Portal with problem Mixed content http and https

Try using the _sys_https_redirect irule that is built into the BigIP. It is written specifically to do http to https redirection. In 11.6.0 it looks like this:

when HTTP_REQUEST {
       HTTP::redirect https://[getfield [HTTP::host] ":" 1][HTTP::uri]
    }

Also, your test conditions in your switch statement are identical and you have no default. This is probably not what you want.