HTTP/1.1, part 3: Message Payload and Content Negotiation
Yves Lafon, Roy T. Fielding, Julian Reschke · 2012
The Hypertext Transfer Protocol (HTTP) is an application-level protocol for distributed, collaborative, hypermedia information systems. HTTP has been in use by the World Wide Web global information initiative since 1990. This document is Part 3 of the seven-part specification that defines the protocol referred to as HTTP/1.1 and, taken together, obsoletes RFC 2616. Part 3 defines HTTP message content, metadata, and content negotiation.