Document Name: RFC 7232
Document URI: urn:ietf:rfc:7232
Online Version:
Organization: Internet Engineering Task Force (IETF)
Series: Request for Comments (RFC)
Abstract: The Hypertext Transfer Protocol (HTTP) is an 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.

Specified Web Concepts:

HTTP Header Fields

ETag , If-Match , If-Modified-Since , If-None-Match , If-Unmodified-Since , Last-Modified

HTTP Status Codes

304 , 412

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