HTTPbis M. Bishop
Internet-Draft Akamai
Intended status: Standards Track 5 October 2022
Expires: 8 April 2023
The ORIGIN Extension in HTTP/3
draft-ietf-httpbis-origin-h3-01
Abstract
The ORIGIN frame for HTTP/2 is equally applicable to HTTP/3, but
needs to be separately registered. This document describes the
ORIGIN frame for HTTP/3.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. The ORIGIN HTTP/3 Frame . . . . . . . . . . . . . . . . . . . 2
2.1. Frame Layout . . . . . . . . . . . . . . . . . . . . . . 2
3. Security Considerations . . . . . . . . . . . . . . . . . . . 3
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3
5. References . . . . . . . . . . . . . . . . . . . . . . . . . 3
5.1. Normative References . . . . . . . . . . . . . . . . . . 3
5.2. Informative References . . . . . . . . . . . . . . . . . 4
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 4
1. Introduction
Existing RFCs define extensions to HTTP/2 [HTTP2] which remain useful
in HTTP/3. Appendix A.2.3 of [HTTP3] describes the required updates
for HTTP/2 frames to be used with HTTP/3.
[ORIGIN] defines the HTTP/2 ORIGIN frame, which indicates what
origins are available on a given connection. It defines a single
HTTP/2 frame type.
2. The ORIGIN HTTP/3 Frame
The ORIGIN HTTP/3 frame allows a server to indicate what origin(s)
([RFC6454]) the server would like the client to consider as members
of the Origin Set (Section 2.3 of [ORIGIN]) for the connection within
which it occurs.
The semantics of the frame payload are identical to those of the
HTTP/2 frame defined in [ORIGIN]. Where HTTP/2 reserves Stream 0 for
frames related to the state of the connection, HTTP/3 defines a pair
of unidirectional streams called "control streams" for this purpose.
Where [ORIGIN] indicates that the ORIGIN frame should be sent on
Stream 0, this should be interpreted to mean the HTTP/3 control
stream. The ORIGIN frame is sent from servers to clients on the
server's control stream.
2.1. Frame Layout
The ORIGIN frame has a nearly identical layout to that used in
HTTP/2, restated here for clarity. The ORIGIN frame type is 0xc
(decimal 12) as in HTTP/2. The payload contains zero or more
instances of the Origin-Entry field.
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HTTP/3 Origin-Entry {
Origin-Len (16),
ASCII-Origin (..),
}
HTTP/3 ORIGIN Frame {
Type (i) = 0x0c,
Length (i),
Origin-Entry (..) ...,
}
Figure 1: ORIGIN Frame Layout
An Origin-Entry is a length-delimited string. Specifically, it
contains two fields:
Origin-Len: An unsigned, 16-bit integer indicating the length, in
octets, of the ASCII-Origin field.
ASCII-Origin: An OPTIONAL sequence of characters containing the
ASCII serialization of an origin ([RFC6454], Section 6.2) that the
sender asserts this connection is or could be authoritative for.
3. Security Considerations
This document introduces no new security considerations beyond those
discussed in [ORIGIN] and [HTTP3].
4. IANA Considerations
This document registers a frame type in the "HTTP/3 Frame Type"
registry ([HTTP3]).
+============+=======+===============+
| Frame Type | Value | Specification |
+============+=======+===============+
| ORIGIN | 0xc | Section 2 |
+------------+-------+---------------+
Table 1: Registered HTTP/3 Frame Types
5. References
5.1. Normative References
[HTTP2] Thomson, M., Ed. and C. Benfield, Ed., "HTTP/2", RFC 9113,
DOI 10.17487/RFC9113, June 2022,
<https://www.rfc-editor.org/rfc/rfc9113>.
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[HTTP3] Bishop, M., Ed., "HTTP/3", RFC 9114, DOI 10.17487/RFC9114,
June 2022, <https://www.rfc-editor.org/rfc/rfc9114>.
[ORIGIN] Nottingham, M. and E. Nygren, "The ORIGIN HTTP/2 Frame",
RFC 8336, DOI 10.17487/RFC8336, March 2018,
<https://www.rfc-editor.org/rfc/rfc8336>.
5.2. Informative References
[RFC6454] Barth, A., "The Web Origin Concept", RFC 6454,
DOI 10.17487/RFC6454, December 2011,
<https://www.rfc-editor.org/rfc/rfc6454>.
Author's Address
Mike Bishop
Akamai
Email: mbishop@evequefou.be
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