Форум

   server {
       listen       80;
       server_name  www.hobbyrum.ru;
       return       301 http://hobbyrum.ru$request_uri;
   }

   server {
       listen       80;
       server_name  hobbyrum.ru;
       ...
   }

# Default website
   server {

      listen 80 default_server;
      server_name _;
      server_name_in_redirect off;

      proxy_set_header   X-Real-IP        $remote_addr;
      proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
      proxy_set_header   Host $host:80;

      set $proxyserver   "http://127.0.0.1:8888";
      set $docroot      "/home/bitrix/www";

      index index.php;
      root /home/bitrix/www;

      # Redirect to ssl if need
      if (-f /home/bitrix/www/.htsecure) { rewrite ^(.*)$ https://$host$1 permanent; }

      # Include parameters common to all websites
      include bx/conf/bitrix.conf;

      # Include server monitoring locations
      include bx/server_monitor.conf;
   }

RewriteCond %{HTTP_HOST} ^www.hobbyrum.ru$ [NC]
RewriteRule ^(.*)$ https://hobbyrum.ru/$1 [R=permanent,L]
RewriteCond %{HTTP_HOST} ^www.xn--90aavqgpvk.xn--p1ai
RewriteRule ^(.*)$ https://hobbyrum.ru/$1 [R=permanent,L]
RewriteCond %{HTTP_HOST} ^xn--90aavqgpvk.xn--p1ai
RewriteRule ^(.*)$ https://hobbyrum.ru/$1 [R=permanent,L]

$ curl -I http://www.hobbyrum.ru

HTTP/1.0 301 Moved Permanently
Server: nginx/1.6.2
Date: Mon, 20 Apr 2015 09:54:59 GMT
Content-Type: text/html
Content-Length: 184
Location: https://www.hobbyrum.ru/

$ curl -I http://hobbyrum.ru

HTTP/1.0 301 Moved Permanently
Server: nginx/1.6.2
Date: Mon, 20 Apr 2015 09:55:04 GMT
Content-Type: text/html
Content-Length: 184
Location: https://hobbyrum.ru/