load balancer

I'm having a nightmarish problem getting IE 9 to redirect from http to https. I've looked at a discussion from about a year ago (http://groups.drupal.org/node/206813), but in that case, nginx is in complete control.

In my case, I'm in AWS, and https is actually getting handled by an elastic load balancer (ELB), which is proxying over to nginx over port 80, and setting http_x_forwarded_proto:

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#x_forwarded_proto stuff for elb/https issues - see http://daniel.hahler.de/handle-x-forwarded-proto-in-backend-nginx
set $my_https "off";