Question

why HTTP is required

Answer 1

HTTP is a stateless protocol. A stateless protocol does not require theHTTP server to retain information or status about each user for the duration of multiple requests. However, some web applications implement states or server side sessions using for instanceHTTP cookies or hidden variables within web forms.

Answer 2

The Hypertext Transfer Protocol (HTTP) is an application protocol for distributed, collaborative, and hypermedia information systems.[1] HTTP is the foundation of data communication for the World Wide Web.

Hypertext is structured text that uses logical links (hyperlinks) between nodes containing text. HTTP is the protocol to exchange or transfer hypertext.