rfc9218v4.txt		rfc9218.txt
	Internet Engineering Task Force (IETF) 奥 一穂 (K. Oku)		Internet Engineering Task Force (IETF) 奥 一穂 (K. Oku)
	Request for Comments: 9218 Fastly		Request for Comments: 9218 Fastly
	Category: Standards Track L. Pardue		Category: Standards Track L. Pardue
	ISSN: 2070-1721 Cloudflare		ISSN: 2070-1721 Cloudflare
	April 2022		June 2022
	Extensible Prioritization Scheme for HTTP		Extensible Prioritization Scheme for HTTP
	Abstract		Abstract
	This document describes a scheme that allows an HTTP client to		This document describes a scheme that allows an HTTP client to
	communicate its preferences for how the upstream server prioritizes		communicate its preferences for how the upstream server prioritizes
	responses to its requests, and also allows a server to hint to a		responses to its requests, and also allows a server to hint to a
	downstream intermediary how its responses should be prioritized when		downstream intermediary how its responses should be prioritized when
	they are forwarded. This document defines the Priority header field		they are forwarded. This document defines the Priority header field
	skipping to change at line 1031 ¶		skipping to change at line 1031 ¶
	| | processed incrementally. | |		| | processed incrementally. | |
	+------+----------------------------------+-------------+		+------+----------------------------------+-------------+
	Table 1: Initial Priority Parameters		Table 1: Initial Priority Parameters
	17. References		17. References
	17.1. Normative References		17.1. Normative References
	[HTTP] Fielding, R., Ed., Nottingham, M., Ed., and J. Reschke,		[HTTP] Fielding, R., Ed., Nottingham, M., Ed., and J. Reschke,
	Ed., "HTTP Semantics", RFC 9110, DOI 10.17487/RFC9110,		Ed., "HTTP Semantics", STD 97, RFC 9110,
	April 2022, <https://www.rfc-editor.org/info/rfc9110>.		DOI 10.17487/RFC9110, June 2022,
			<https://www.rfc-editor.org/info/rfc9110>.
	[HTTP/2] Thomson, M., Ed. and C. Benfield, Ed., "HTTP/2", RFC 9113,		[HTTP/2] Thomson, M., Ed. and C. Benfield, Ed., "HTTP/2", RFC 9113,
	DOI 10.17487/RFC9113, April 2022,		DOI 10.17487/RFC9113, June 2022,
	<https://www.rfc-editor.org/info/rfc9113>.		<https://www.rfc-editor.org/info/rfc9113>.
	[HTTP/3] Bishop, M., Ed., "Hypertext Transfer Protocol Version 3		[HTTP/3] Bishop, M., Ed., "HTTP/3", RFC 9114, DOI 10.17487/RFC9114,
	(HTTP/3)", RFC 9114, DOI 10.17487/RFC9114, April 2022,		June 2022, <https://www.rfc-editor.org/info/rfc9114>.
	<https://www.rfc-editor.org/info/rfc9114>.
	[QUIC] Iyengar, J., Ed. and M. Thomson, Ed., "QUIC: A UDP-Based		[QUIC] Iyengar, J., Ed. and M. Thomson, Ed., "QUIC: A UDP-Based
	Multiplexed and Secure Transport", RFC 9000,		Multiplexed and Secure Transport", RFC 9000,
	DOI 10.17487/RFC9000, May 2021,		DOI 10.17487/RFC9000, May 2021,
	<https://www.rfc-editor.org/info/rfc9000>.		<https://www.rfc-editor.org/info/rfc9000>.
	[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate		[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
	Requirement Levels", BCP 14, RFC 2119,		Requirement Levels", BCP 14, RFC 2119,
	DOI 10.17487/RFC2119, March 1997,		DOI 10.17487/RFC2119, March 1997,
	<https://www.rfc-editor.org/info/rfc2119>.		<https://www.rfc-editor.org/info/rfc2119>.
	skipping to change at line 1069 ¶		skipping to change at line 1069 ¶
	May 2017, <https://www.rfc-editor.org/info/rfc8174>.		May 2017, <https://www.rfc-editor.org/info/rfc8174>.
	[STRUCTURED-FIELDS]		[STRUCTURED-FIELDS]
	Nottingham, M. and P-H. Kamp, "Structured Field Values for		Nottingham, M. and P-H. Kamp, "Structured Field Values for
	HTTP", RFC 8941, DOI 10.17487/RFC8941, February 2021,		HTTP", RFC 8941, DOI 10.17487/RFC8941, February 2021,
	<https://www.rfc-editor.org/info/rfc8941>.		<https://www.rfc-editor.org/info/rfc8941>.
	17.2. Informative References		17.2. Informative References
	[CACHING] Fielding, R., Ed., Nottingham, M., Ed., and J. Reschke,		[CACHING] Fielding, R., Ed., Nottingham, M., Ed., and J. Reschke,
	Ed., "HTTP Caching", RFC 9111, DOI 10.17487/RFC9111, April		Ed., "HTTP Caching", STD 98, RFC 9111,
	2022, <https://www.rfc-editor.org/info/rfc9111>.		DOI 10.17487/RFC9111, June 2022,
			<https://www.rfc-editor.org/info/rfc9111>.
	[FORWARDED]		[FORWARDED]
	Petersson, A. and M. Nilsson, "Forwarded HTTP Extension",		Petersson, A. and M. Nilsson, "Forwarded HTTP Extension",
	RFC 7239, DOI 10.17487/RFC7239, June 2014,		RFC 7239, DOI 10.17487/RFC7239, June 2014,
	<https://www.rfc-editor.org/info/rfc7239>.		<https://www.rfc-editor.org/info/rfc7239>.
	[MARX] Marx, R., De Decker, T., Quax, P., and W. Lamotte, "Of the		[MARX] Marx, R., De Decker, T., Quax, P., and W. Lamotte, "Of the
	Utmost Importance: Resource Prioritization in HTTP/3 over		Utmost Importance: Resource Prioritization in HTTP/3 over
	QUIC", SCITEPRESS Proceedings of the 15th International		QUIC", SCITEPRESS Proceedings of the 15th International
	Conference on Web Information Systems and Technologies		Conference on Web Information Systems and Technologies
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