Nginx for rails + CDN + SSL

_etc_nginx_sites-available_website

server {
        listen 443 ssl;
        server_name domain.com;

        add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;

        ssl_certificate /etc/ssl/certs/domain.crt;
        ssl_certificate_key /etc/ssl/certs/domain.key;

        ssl on;
        ssl_session_cache  builtin:1000  shared:SSL:10m;
        ssl_ciphers 'ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA';
        ssl_prefer_server_ciphers on;
        ssl_dhparam /etc/ssl/certs/dhparams.pem;

        client_max_body_size 10m;

        location / {
                proxy_pass http://backend;
                proxy_redirect off;
                proxy_set_header   Host             $host;
                proxy_set_header   X-Real-IP        $remote_addr;
                proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
        }

        set $cors "";

        if ($http_origin ~* (.*\.domain.com)) {
                set $cors "true";
        }

        location ~ ^/assets/ {
                if ($cors = "true") {
                        add_header Access-Control-Allow-Origin $http_origin;
                        add_header Access-Control-Allow-Methods GET;
                }
                return 301 https://assets.domain.com$request_uri;
        }

        location ~ ^/robots.txt$ {
                alias /home/ubuntu/website/current/public/robots.txt;
        }

}

server {
        listen 443 ssl;
        server_name assets.domain.com;

        ssl_certificate /etc/ssl/certs/domain.crt;
        ssl_certificate_key /etc/ssl/certs/domain.key;

        ssl on;
        ssl_session_cache  builtin:1000  shared:SSL:10m;
        ssl_ciphers 'ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA';
        ssl_prefer_server_ciphers on;
        ssl_dhparam /etc/ssl/certs/dhparams.pem;

        client_max_body_size 10m;

        location / {
                deny all;
        }

        if ($http_origin ~* (.*\.domain.com)) {
                set $cors "true";
        }

        location ~ ^/assets/ {
                if ($cors = "true") {
                        add_header Access-Control-Allow-Origin $http_origin;
                        add_header Access-Control-Allow-Methods GET;
                }
                root /home/ubuntu/website/current/public;
                expires max;
                add_header Cache-Control public;
                gzip_static on;
                #add_header ETag "";
                break;
        }
}