Hypertext Transfer Protocol (HTTP/1.1): Conditional Requests
2014
The Hypertext Transfer Protocol (HTTP) is a stateless applicationlevel 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. Status of This Memo This is an Internet Standards Track document.This document is a product of the Internet Engineering Task Force (IETF).It represents the consensus of the IETF community.It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG).Further information on Internet Standards is available in Section 2 of RFC 5741.