|Internet-Draft||HTTP/2 Extensions in HTTP/3||May 2020|
|Bishop||Expires 16 November 2020||[Page]|
- Intended Status:
- Standards Track
Existing HTTP/2 Extensions in HTTP/3
The ALTSVC and ORIGIN frames for HTTP/2 are equally applicable to HTTP/3, but need to be separately registered. This document describes the ALTSVC and ORIGIN frames for HTTP/3.¶
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[ALTSVC] defines HTTP Alternative Services, which allow an origin's resources to be authoritatively available at a separate network location, possibly accessed with a different protocol configuration. It defines two mechanisms for transporting such information, an HTTP response header and an HTTP/2 frame type.¶
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 the existing RFCs indicate that a stream should be sent on Stream 0, this should be interpreted to mean the HTTP/3 control stream.¶
The ALTSVC HTTP/3 frame advertises the availability of an alternative service to an HTTP/3 client.¶
An ALTSVC frame from a server to a client on the server's control stream indicates that the conveyed alternative service is associated with the origin contained in the Origin field of the frame.¶
An ALTSVC frame from a server to a client on a stream other than the control stream indicates that the conveyed alternative service is associated with the origin of that stream.¶
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 ORIGIN frame is sent from servers to clients on the server's control stream.¶
- Nottingham, M., McManus, P., and J. Reschke, "HTTP Alternative Services", RFC 7838, DOI 10.17487/RFC7838, , <https://www.rfc-editor.org/info/rfc7838>.
- Bishop, M., "Hypertext Transfer Protocol Version 3 (HTTP/3)", Work in Progress, Internet-Draft, draft-ietf-quic-http-27, , <http://www.ietf.org/internet-drafts/draft-ietf-quic-http-27.txt>.
- Nottingham, M. and E. Nygren, "The ORIGIN HTTP/2 Frame", RFC 8336, DOI 10.17487/RFC8336, , <https://www.rfc-editor.org/info/rfc8336>.
- Barth, A., "The Web Origin Concept", RFC 6454, DOI 10.17487/RFC6454, , <https://www.rfc-editor.org/info/rfc6454>.
- Belshe, M., Peon, R., and M. Thomson, Ed., "Hypertext Transfer Protocol Version 2 (HTTP/2)", RFC 7540, DOI 10.17487/RFC7540, , <https://www.rfc-editor.org/info/rfc7540>.