server {
    server_name varsavsky.ru;
    location / {
      proxy_pass http://vk.com:80/;
      proxy_redirect off;
      proxy_set_header Host vk.com;
      proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header Accept-Encoding "";
      proxy_buffers 256 32k;
      sub_filter 'vk.com' 'varsavsky.ru';
      sub_filter_once off;
    }
}