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The full form of HTTP is Hyper Text Transfer Protocol. And HTTP2 is the second major version of the application protocol in the form of HTTP/2.
A protocol is a set of rules that administer the information correspondence systems between customers (for instance Internet browsers utilized by web clients to demand data) and servers (the machines containing the mentioned data).
The Hypertext Transfer Protocol (HTTP) is an application convention for dispersed, shared, hypermedia data systems. HTTP is the establishment of information correspondence for the World Wide Web i.e Internet,
where hypertext reports incorporate hyperlinks to different assets that the client can without much of a stretch access, for instance by a mouse click or by tapping the screen in an Internet browser.
Improvement of HTTP was started by Tim Berners-Lee at CERN in 1989. Advancement of early HTTP Requests for Comments (RFCs) was an organized exertion by the Internet Engineering Task Force (IETF)
and the World Wide Web Consortium (W3C), with work later moving to the IETF.
HTTP/1.1 was first archived in RFC 2068 out of 1997. That particular was obsoleted by RFC 2616 of every 1999, which was in like manner supplanted by the RFC 7230 group of RFCs in 2014. HTTP/2 is an increasingly productive articulation of HTTP's semantics "on the wire", and was distributed in 2015; it is currently bolstered by significant web servers and programs over Transport Layer Security (TLS) utilizing an Application-Layer Protocol Negotiation (ALPN) extension where TLS 1.2 or fresher is required.
This are the beginning era of Internet Protocol : HTTP 0.9 --> HTTP 1.0 --> HTTP 1.1 --> SPDY 1.0 --> SPDY 2.0 --> HTTP 2.0 --> HTTP 3.0
You can test if your Domain uses HTTP/2 or not by our free SEO HTTP2 test Tool. It will inspect and will give you the result if your website can support HTTP/2 or not. You need to contact your Website Hosting provider if your website cannot support HTTP/2 protocol, you need to have the latest Software in order to support HTTP/2, for instance HTTP/2 Support was introduced in IIS 10.0, and your website should be hosted in Windows Server 2016 for HTTP/2 to work.