ELB配下のEC2のnginxで、httpをhttpsにリダイレクトする方法。 http://live-cast.asia/blog/2014/06/redirect-https-to-http-in-the-instance-of-the-elb-under-nginx.html

nginx.conf

location / {
  root /usr/share/nginx/html;
  index index.html index.htm index.php;
  set $redirect "";
  if ($http_x_forwarded_proto != 'https') {
    set $redirect "1";
  }
  if ($http_user_agent !~* ELB-HealthChecker) {
    set $redirect "${redirect}1";
  }
  if ($http_host ~ "www.example.com") {
    set $redirect "${redirect}1";
  }
  if ($redirect = "111") {
    rewrite ^ https://$host$request_uri? permanent;
  }
}