Internet Engineering Task Force (IETF)R. Fielding, Editor
Request for Comments: 7232Adobe
Obsoletes: 2616J. Reschke, Editor
Category: Standards Trackgreenbytes
ISSN: 2070-1721June 2014

Hypertext Transfer Protocol (HTTP/1.1): Conditional Requests


The Hypertext Transfer Protocol (HTTP) is a stateless application-level protocol for distributed, collaborative, hypertext information systems. This document defines HTTP/1.1 conditional requests, including metadata header fields for indicating state changes, request header fields for making preconditions on such state, and rules for constructing the responses to a conditional request when one or more preconditions evaluate to false.