The ORIGIN HTTP/2 Frame
draft-ietf-httpbis-origin-frame-00

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Document Type Active Internet-Draft (httpbis WG)
Last updated 2016-05-09
Replaces draft-nottingham-httpbis-origin-frame
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HTTP Working Group                                         M. Nottingham
Internet-Draft                                                 E. Nygren
Intended status: Standards Track                                  Akamai
Expires: November 11, 2016                                  May 10, 2016

                        The ORIGIN HTTP/2 Frame
                   draft-ietf-httpbis-origin-frame-00

Abstract

   This document specifies the ORIGIN frame for HTTP/2, to indicate what
   origins are available on a given connection.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on November 11, 2016.

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   Copyright (c) 2016 IETF Trust and the persons identified as the
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Nottingham & Nygren     Expires November 11, 2016               [Page 1]
Internet-Draft                ORIGIN Frames                     May 2016

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Notational Conventions  . . . . . . . . . . . . . . . . .   2
     1.2.  The ORIGIN HTTP/2 Frame . . . . . . . . . . . . . . . . .   2
   2.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   3.  Normative References  . . . . . . . . . . . . . . . . . . . .   3
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   4

1.  Introduction

   HTTP/2 [RFC7540] allows clients to coalesce different origins
   [RFC6454] onto the same connection when certain conditions are met.
   In some cases, the server is not authoritative for a coalesced
   origin, so the 421 (Misdirected Request) status code was defined.

   Using a status code in this manner allows clients to recover from
   misdirected requests, but at the penalty of adding latency.  To
   address that, this specification defines a new HTTP/2 frame type,
   "ORIGIN", to allow servers to indicate what origins a connection is
   authoritative for.

1.1.  Notational Conventions

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

1.2.  The ORIGIN HTTP/2 Frame

   The ORIGIN HTTP/2 frame ([RFC7540], Section 4) indicates what
   origin(s) [RFC6454] the sender considers this connection
   authoritative for (in the sense of [RFC7540], Section 10.1).

   The ORIGIN frame is a non-critical extension to HTTP/2.  Endpoints
   that do not support this frame can safely ignore it.

   It MUST occur on stream 0; an ORIGIN frame on any other stream is
   invalid and MUST be ignored.

   When received by a client, it can be used to inform HTTP/2 connection
   coalescing (see [RFC7540], Section 9.1.1), but does not relax the
   requirement there that the server is authoritative.

   If multiple ORIGIN frames are received on the same connection, only
   the most recent is to be considered current.

Nottingham & Nygren     Expires November 11, 2016               [Page 2]
Internet-Draft                ORIGIN Frames                     May 2016

   Once an ORIGIN frame has been received and processed, clients that
   implement this specification SHOULD NOT use that connection for a
   given origin if it did not appear within the current ORIGIN frame.

   The ORIGIN frame type is 0xb (decimal 11).

   +-------------------------------+-------------------------------+
   |         Origin-Len (16)       | Origin? (*)                 ...
   +-------------------------------+-------------------------------+

   The ORIGIN frame contains the following fields, sets of which may be
   repeated within the frame to indicate multiple origins:

   Origin-Len: An unsigned, 16-bit integer indicating the length, in
   octets, of the Origin field.  Origin: An optional sequence of
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