I want my whole site redirected to HTTPS except one page ("/employment").
If they visit that page on HTTPS, I want it redirected to HTTP, because it's hosted elsewhere so is in an iframe and does not support SSL.
I also want to continue using friendly URLs.
I have seen many a tutorial on SSL redirection but no working mix of HTTP-to-HTTPS, HTTPS-to-HTTP, and friendly URLs.
What exactly goes in my .htaccess to do this?