draft-ietf-httpbis-cache-18.txt   draft-ietf-httpbis-cache-19.txt 
HTTP Working Group R. Fielding, Ed. HTTP Working Group R. Fielding, Ed.
Internet-Draft Adobe Internet-Draft Adobe
Obsoletes: 7234 (if approved) M. Nottingham, Ed. Obsoletes: 7234 (if approved) M. Nottingham, Ed.
Intended status: Standards Track Fastly Intended status: Standards Track Fastly
Expires: 19 February 2022 J. Reschke, Ed. Expires: 14 March 2022 J. Reschke, Ed.
greenbytes greenbytes
18 August 2021 10 September 2021
HTTP Caching HTTP Caching
draft-ietf-httpbis-cache-18 draft-ietf-httpbis-cache-19
Abstract Abstract
The Hypertext Transfer Protocol (HTTP) is a stateless application- The Hypertext Transfer Protocol (HTTP) is a stateless application-
level protocol for distributed, collaborative, hypertext information level protocol for distributed, collaborative, hypertext information
systems. This document defines HTTP caches and the associated header systems. This document defines HTTP caches and the associated header
fields that control cache behavior or indicate cacheable response fields that control cache behavior or indicate cacheable response
messages. messages.
This document obsoletes RFC 7234. This document obsoletes RFC 7234.
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This note is to be removed before publishing as an RFC. This note is to be removed before publishing as an RFC.
Discussion of this draft takes place on the HTTP working group Discussion of this draft takes place on the HTTP working group
mailing list (ietf-http-wg@w3.org), which is archived at mailing list (ietf-http-wg@w3.org), which is archived at
<https://lists.w3.org/Archives/Public/ietf-http-wg/>. <https://lists.w3.org/Archives/Public/ietf-http-wg/>.
Working Group information can be found at <https://httpwg.org/>; Working Group information can be found at <https://httpwg.org/>;
source code and issues list for this draft can be found at source code and issues list for this draft can be found at
<https://github.com/httpwg/http-core>. <https://github.com/httpwg/http-core>.
The changes in this draft are summarized in Appendix C.19. The changes in this draft are summarized in Appendix C.20.
Status of This Memo Status of This Memo
This Internet-Draft is submitted in full conformance with the This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79. provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/. Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on 19 February 2022. This Internet-Draft will expire on 14 March 2022.
Copyright Notice Copyright Notice
Copyright (c) 2021 IETF Trust and the persons identified as the Copyright (c) 2021 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents (https://trustee.ietf.org/ Provisions Relating to IETF Documents (https://trustee.ietf.org/
license-info) in effect on the date of publication of this document. license-info) in effect on the date of publication of this document.
Please review these documents carefully, as they describe your rights Please review these documents carefully, as they describe your rights
skipping to change at page 4, line 30 skipping to change at page 4, line 30
C.10. Since draft-ietf-httpbis-cache-08 . . . . . . . . . . . . 43 C.10. Since draft-ietf-httpbis-cache-08 . . . . . . . . . . . . 43
C.11. Since draft-ietf-httpbis-cache-09 . . . . . . . . . . . . 43 C.11. Since draft-ietf-httpbis-cache-09 . . . . . . . . . . . . 43
C.12. Since draft-ietf-httpbis-cache-10 . . . . . . . . . . . . 43 C.12. Since draft-ietf-httpbis-cache-10 . . . . . . . . . . . . 43
C.13. Since draft-ietf-httpbis-cache-11 . . . . . . . . . . . . 44 C.13. Since draft-ietf-httpbis-cache-11 . . . . . . . . . . . . 44
C.14. Since draft-ietf-httpbis-cache-12 . . . . . . . . . . . . 44 C.14. Since draft-ietf-httpbis-cache-12 . . . . . . . . . . . . 44
C.15. Since draft-ietf-httpbis-cache-13 . . . . . . . . . . . . 45 C.15. Since draft-ietf-httpbis-cache-13 . . . . . . . . . . . . 45
C.16. Since draft-ietf-httpbis-cache-14 . . . . . . . . . . . . 45 C.16. Since draft-ietf-httpbis-cache-14 . . . . . . . . . . . . 45
C.17. Since draft-ietf-httpbis-cache-15 . . . . . . . . . . . . 46 C.17. Since draft-ietf-httpbis-cache-15 . . . . . . . . . . . . 46
C.18. Since draft-ietf-httpbis-cache-16 . . . . . . . . . . . . 46 C.18. Since draft-ietf-httpbis-cache-16 . . . . . . . . . . . . 46
C.19. Since draft-ietf-httpbis-cache-17 . . . . . . . . . . . . 46 C.19. Since draft-ietf-httpbis-cache-17 . . . . . . . . . . . . 46
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 46 C.20. Since draft-ietf-httpbis-cache-18 . . . . . . . . . . . . 46
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 47
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 48 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 49
1. Introduction 1. Introduction
The Hypertext Transfer Protocol (HTTP) is a stateless application- The Hypertext Transfer Protocol (HTTP) is a stateless application-
level request/response protocol that uses extensible semantics and level request/response protocol that uses extensible semantics and
self-descriptive messages for flexible interaction with network-based self-descriptive messages for flexible interaction with network-based
hypertext information systems. It is typically used for distributed hypertext information systems. It is typically used for distributed
information systems, where the use of response caches can improve information systems, where the use of response caches can improve
performance. This document defines aspects of HTTP related to performance. This document defines aspects of HTTP related to
caching and reusing response messages. caching and reusing response messages.
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Please add a note to the "Hypertext Transfer Protocol (HTTP) Warn Please add a note to the "Hypertext Transfer Protocol (HTTP) Warn
Codes" registry at <https://www.iana.org/assignments/http-warn-codes> Codes" registry at <https://www.iana.org/assignments/http-warn-codes>
to the effect that Warning is obsoleted. to the effect that Warning is obsoleted.
9. References 9. References
9.1. Normative References 9.1. 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", Work in Progress, Internet-Draft, Ed., "HTTP Semantics", Work in Progress, Internet-Draft,
draft-ietf-httpbis-semantics-18, 18 August 2021, draft-ietf-httpbis-semantics-19, 10 September 2021,
<https://datatracker.ietf.org/doc/html/draft-ietf-httpbis- <https://datatracker.ietf.org/doc/html/draft-ietf-httpbis-
semantics-18>. semantics-19>.
[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>.
[RFC5234] Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax [RFC5234] Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax
Specifications: ABNF", STD 68, RFC 5234, Specifications: ABNF", STD 68, RFC 5234,
DOI 10.17487/RFC5234, January 2008, DOI 10.17487/RFC5234, January 2008,
<https://www.rfc-editor.org/info/rfc5234>. <https://www.rfc-editor.org/info/rfc5234>.
skipping to change at page 38, line 37 skipping to change at page 38, line 37
May 2017, <https://www.rfc-editor.org/info/rfc8174>. May 2017, <https://www.rfc-editor.org/info/rfc8174>.
9.2. Informative References 9.2. Informative References
[COOKIE] Barth, A., "HTTP State Management Mechanism", RFC 6265, [COOKIE] Barth, A., "HTTP State Management Mechanism", RFC 6265,
DOI 10.17487/RFC6265, April 2011, DOI 10.17487/RFC6265, April 2011,
<https://www.rfc-editor.org/info/rfc6265>. <https://www.rfc-editor.org/info/rfc6265>.
[HTTP/1.1] Fielding, R., Ed., Nottingham, M., Ed., and J. Reschke, [HTTP/1.1] Fielding, R., Ed., Nottingham, M., Ed., and J. Reschke,
Ed., "HTTP/1.1", Work in Progress, Internet-Draft, draft- Ed., "HTTP/1.1", Work in Progress, Internet-Draft, draft-
ietf-httpbis-messaging-18, 18 August 2021, ietf-httpbis-messaging-19, 10 September 2021,
<https://datatracker.ietf.org/doc/html/draft-ietf-httpbis- <https://datatracker.ietf.org/doc/html/draft-ietf-httpbis-
messaging-18>. messaging-19>.
[RFC2616] Fielding, R., Gettys, J., Mogul, J., Frystyk, H., [RFC2616] Fielding, R., Gettys, J., Mogul, J., Frystyk, H.,
Masinter, L., Leach, P., and T. Berners-Lee, "Hypertext Masinter, L., Leach, P., and T. Berners-Lee, "Hypertext
Transfer Protocol -- HTTP/1.1", RFC 2616, Transfer Protocol -- HTTP/1.1", RFC 2616,
DOI 10.17487/RFC2616, June 1999, DOI 10.17487/RFC2616, June 1999,
<https://www.rfc-editor.org/info/rfc2616>. <https://www.rfc-editor.org/info/rfc2616>.
[RFC5861] Nottingham, M., "HTTP Cache-Control Extensions for Stale [RFC5861] Nottingham, M., "HTTP Cache-Control Extensions for Stale
Content", RFC 5861, DOI 10.17487/RFC5861, April 2010, Content", RFC 5861, DOI 10.17487/RFC5861, April 2010,
<https://www.rfc-editor.org/info/rfc5861>. <https://www.rfc-editor.org/info/rfc5861>.
skipping to change at page 39, line 18 skipping to change at page 39, line 18
<https://www.rfc-editor.org/info/rfc7234>. <https://www.rfc-editor.org/info/rfc7234>.
[RFC8126] Cotton, M., Leiba, B., and T. Narten, "Guidelines for [RFC8126] Cotton, M., Leiba, B., and T. Narten, "Guidelines for
Writing an IANA Considerations Section in RFCs", BCP 26, Writing an IANA Considerations Section in RFCs", BCP 26,
RFC 8126, DOI 10.17487/RFC8126, June 2017, RFC 8126, DOI 10.17487/RFC8126, June 2017,
<https://www.rfc-editor.org/info/rfc8126>. <https://www.rfc-editor.org/info/rfc8126>.
Appendix A. Collected ABNF Appendix A. Collected ABNF
In the collected ABNF below, list rules are expanded as per In the collected ABNF below, list rules are expanded as per
Section 5.6.1.1 of [HTTP]. Section 5.6.1 of [HTTP].
Age = delta-seconds Age = delta-seconds
Cache-Control = [ cache-directive *( OWS "," OWS cache-directive ) ] Cache-Control = [ cache-directive *( OWS "," OWS cache-directive ) ]
Expires = HTTP-date Expires = HTTP-date
HTTP-date = <HTTP-date, see [HTTP], Section 5.6.7> HTTP-date = <HTTP-date, see [HTTP], Section 5.6.7>
OWS = <OWS, see [HTTP], Section 5.6.3> OWS = <OWS, see [HTTP], Section 5.6.3>
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* Move cache-related aspects of validator use from [HTTP] into * Move cache-related aspects of validator use from [HTTP] into
Section 4.3.1 (<https://github.com/httpwg/http-core/issues/933>) Section 4.3.1 (<https://github.com/httpwg/http-core/issues/933>)
* Use term "clock" defined in Section 6.6.1 of [HTTP] throughout * Use term "clock" defined in Section 6.6.1 of [HTTP] throughout
(<https://github.com/httpwg/http-core/issues/953>) (<https://github.com/httpwg/http-core/issues/953>)
* Throughout, disambiguate "selected representation" and "selected * Throughout, disambiguate "selected representation" and "selected
response" (now "chosen response") (<https://github.com/httpwg/ response" (now "chosen response") (<https://github.com/httpwg/
http-core/issues/958>) http-core/issues/958>)
C.20. Since draft-ietf-httpbis-cache-18
* None.
Acknowledgements Acknowledgements
See Appendix "Acknowledgements" of [HTTP]. See Appendix "Acknowledgements" of [HTTP].
Index Index
A C E F G H M N O P S V W A C E F G H M N O P S V W
A A
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