Keep-Alive for 30 secs

   The Keep-Alive general header allows the sender to hint about how the connection may be used to set a timeout and a maximum amount of requests.

Nginx

   Nginx is a web server which can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache. The software was created by Igor Sysoev and first publicly released in 2004. A company of the same name was founded in 2011 to provide support and Nginx plus paid software.

SPF

   The Sender Policy Framework (SPF) is an email-authentication technique which is used to prevent spammers from sending messages on behalf of your domain. With SPF an organisation can publish authorized mail servers.

Cdnjs

   cdnjs is a CDN host for opensource libraries

lodash.js 4.17.10

   A utility library delivering consistency, customization, performance, & extras.

fancybox 3.3.5

   Touch enabled, responsive and fully customizable jQuery lightbox script

Google Fonts API

   Making the web more beautiful, fast, and open through great typography.this website is using PT+Sans&subset=cyrillic,latin-ext font family

Google Fonts API

   Making the web more beautiful, fast, and open through great typography.this website is using PT+Sans+Caption&subset=cyrillic,latin-ext font family

Server partial requests support

   The Accept-Ranges response HTTP header is a marker used by the server to advertise its support of partial requests. The value of this field indicates the unit that can be used to define a range.