Here is what I have so-far, but I'm not sure how to go back.
location ~ ^/(secure) {
          if ($scheme = 'http') {
            #Insecure, lets go to https
            rewrite   ^/(.*)$  https://$host/$1  permanent;
          }
}
Posted at Nginx Forum: http://forum.nginx.org/read.php?2,24495,24496#msg-24496