Age HTTP Header - Original Server Response

   The Age header contains the time in seconds the object has been in a proxy cache.

Vary Header check for User-Agent

   When using the Vary: User-Agent header, caching servers should consider the user agent when deciding whether to serve the page from cache

Varnish

   Varnish is an HTTP accelerator designed for content-heavy dynamic web sites as well as APIs. In contrast to other web accelerators, such as Squid, which began life as a client-side cache, or Apache and nginx, which are primarily origin servers, Varnish was designed as an HTTP accelerator.

PHP 7.0.27

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

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.

OpenSSL 1.1.0i

   OpenSSL is a software library for applications that secure communications over computer networks against eavesdropping or need to identify the party at the other end.

Apache 2.4.34 |Operating System:codeit

   The Apache HTTP Server, colloquially called Apache, is free and open-source cross-platform web server software, released under the terms of Apache License 2.0. Apache is developed and maintained by an open community of developers under the auspices of the Apache Software Foundation.