Rails puma nginx ssl

working.conf

upstream site_name {
 server unix:///home/me/projects/site_name/shared/tmp/sockets/site_name.sock;
}

# for redirecting to https version of the site
server {
  listen 80;
  rewrite ^(.*) https://$host$1 permanent;
}

# for redirecting to non-www version of the site
server {
  listen  80;
  server_name www.site_name.ru;
  rewrite ^(.*) http://site_name.ru$1 permanent;
}

server {
  listen 443 default ssl;
  ssl on;
  ssl_certificate            /etc/nginx/ssl/site_name.ru.crt;
  ssl_certificate_key        /etc/nginx/ssl/site_name.ru.key;
  server_name                site_name.ru;

  try_files $uri/index.html $uri.html $uri @site_name;

  client_max_body_size 4m;

  error_page 502 /502.html;
  location = /502.html {
    root /etc/nginx/error-pages;
  }

  location / {
    proxy_pass http://site_name;
    proxy_set_header Host $host:$server_port;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-Ssl on;
    proxy_set_header X-Forwarded-Proto https;
    proxy_set_header X-SSL 1;
  }

  location ~* ^/assets/ {
    root /home/me/projects/site_name/current/public; # I assume your app is located at that location
    # Per RFC2616 - 1 year maximum expiry
    expires 1y;
    add_header Cache-Control public;
    # Some browsers still send conditional-GET requests if there's a
    # Last-Modified header or an ETag header even if they haven't
    # reached the expiry date sent in the Expires header.
    add_header Last-Modified "";
    add_header ETag "";
    break;
  }
}