The first version of HTTP, referred to as HTTP/0.9, was a simple protocol for raw data transfer across the Internet.
This specification defines the protocol referred to as "HTTP/1.1".
This protocol includes more stringent requirements than HTTP/1.0 in order to ensure reliable implementation of its features.
Practical information systems require more functionality than simple retrieval, including search, front-end update, and annotation.
Fielding Request for Comments: 2616 UC Irvine Obsoletes: 2068 J. HTTP has been in use by the World-Wide Web global information initiative since 1990.
A feature of HTTP is the typing and negotiation of data representation, allowing systems to be built independently of the data being transferred.