Nginx 1.19.1

   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.

Keep-Alive for 10 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.

Vary Header check for cookies

   The Vary HTTP response header determines how to match future request headers to decide whether a cached response can be used rather than requesting a fresh one from the origin server. It is used by the server to indicate which headers it used when selecting a representation of a resource in a content negotiation algorithm.

Character Encoding :"UTF-8"

   This website is using "UTF-8" character encoding in HTML , character encoding is used to represent a repertoire of characters by some kind of encoding system.

PHP 5.6.40

   PHP: Hypertext Preprocessor is a general-purpose programming language originally designed for web development.