draft-ietf-quic-qpack-13.txt   draft-ietf-quic-qpack-14.txt 
QUIC C. Krasic QUIC C. Krasic
Internet-Draft Netflix Internet-Draft Netflix
Intended status: Standards Track M. Bishop Intended status: Standards Track M. Bishop
Expires: 24 August 2020 Akamai Technologies Expires: 24 August 2020 Akamai Technologies
A. Frindell, Ed. A. Frindell, Ed.
Facebook Facebook
21 February 2020 21 February 2020
QPACK: Header Compression for HTTP/3 QPACK: Header Compression for HTTP/3
draft-ietf-quic-qpack-13 draft-ietf-quic-qpack-14
Abstract Abstract
This specification defines QPACK, a compression format for This specification defines QPACK, a compression format for
efficiently representing HTTP header fields, to be used in HTTP/3. efficiently representing HTTP header fields, to be used in HTTP/3.
This is a variation of HPACK header compression that seeks to reduce This is a variation of HPACK header compression that seeks to reduce
head-of-line blocking. head-of-line blocking.
Note to Readers Note to Readers
skipping to change at page 3, line 29 skipping to change at page 3, line 29
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 27 8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 27
8.1. Settings Registration . . . . . . . . . . . . . . . . . . 27 8.1. Settings Registration . . . . . . . . . . . . . . . . . . 27
8.2. Stream Type Registration . . . . . . . . . . . . . . . . 27 8.2. Stream Type Registration . . . . . . . . . . . . . . . . 27
8.3. Error Code Registration . . . . . . . . . . . . . . . . . 27 8.3. Error Code Registration . . . . . . . . . . . . . . . . . 27
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 28 9. References . . . . . . . . . . . . . . . . . . . . . . . . . 28
9.1. Normative References . . . . . . . . . . . . . . . . . . 28 9.1. Normative References . . . . . . . . . . . . . . . . . . 28
9.2. Informative References . . . . . . . . . . . . . . . . . 28 9.2. Informative References . . . . . . . . . . . . . . . . . 28
Appendix A. Static Table . . . . . . . . . . . . . . . . . . . . 29 Appendix A. Static Table . . . . . . . . . . . . . . . . . . . . 29
Appendix B. Sample One Pass Encoding Algorithm . . . . . . . . . 33 Appendix B. Sample One Pass Encoding Algorithm . . . . . . . . . 33
Appendix C. Change Log . . . . . . . . . . . . . . . . . . . . . 34 Appendix C. Change Log . . . . . . . . . . . . . . . . . . . . . 34
C.1. Since draft-ietf-quic-qpack-12 . . . . . . . . . . . . . 35 C.1. Since draft-ietf-quic-qpack-13 . . . . . . . . . . . . . 35
C.2. Since draft-ietf-quic-qpack-11 . . . . . . . . . . . . . 35 C.2. Since draft-ietf-quic-qpack-12 . . . . . . . . . . . . . 35
C.3. Since draft-ietf-quic-qpack-10 . . . . . . . . . . . . . 35 C.3. Since draft-ietf-quic-qpack-11 . . . . . . . . . . . . . 35
C.4. Since draft-ietf-quic-qpack-09 . . . . . . . . . . . . . 35 C.4. Since draft-ietf-quic-qpack-10 . . . . . . . . . . . . . 35
C.5. Since draft-ietf-quic-qpack-08 . . . . . . . . . . . . . 35 C.5. Since draft-ietf-quic-qpack-09 . . . . . . . . . . . . . 35
C.6. Since draft-ietf-quic-qpack-06 . . . . . . . . . . . . . 35 C.6. Since draft-ietf-quic-qpack-08 . . . . . . . . . . . . . 35
C.7. Since draft-ietf-quic-qpack-05 . . . . . . . . . . . . . 35 C.7. Since draft-ietf-quic-qpack-06 . . . . . . . . . . . . . 35
C.8. Since draft-ietf-quic-qpack-04 . . . . . . . . . . . . . 35 C.8. Since draft-ietf-quic-qpack-05 . . . . . . . . . . . . . 35
C.9. Since draft-ietf-quic-qpack-03 . . . . . . . . . . . . . 36 C.9. Since draft-ietf-quic-qpack-04 . . . . . . . . . . . . . 36
C.10. Since draft-ietf-quic-qpack-02 . . . . . . . . . . . . . 36 C.10. Since draft-ietf-quic-qpack-03 . . . . . . . . . . . . . 36
C.11. Since draft-ietf-quic-qpack-01 . . . . . . . . . . . . . 36 C.11. Since draft-ietf-quic-qpack-02 . . . . . . . . . . . . . 36
C.12. Since draft-ietf-quic-qpack-00 . . . . . . . . . . . . . 36 C.12. Since draft-ietf-quic-qpack-01 . . . . . . . . . . . . . 36
C.13. Since draft-ietf-quic-qcram-00 . . . . . . . . . . . . . 37 C.13. Since draft-ietf-quic-qpack-00 . . . . . . . . . . . . . 36
C.14. Since draft-ietf-quic-qcram-00 . . . . . . . . . . . . . 37
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 37 Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 37
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 37 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 37
1. Introduction 1. Introduction
The QUIC transport protocol [QUIC-TRANSPORT] is designed to support The QUIC transport protocol [QUIC-TRANSPORT] is designed to support
HTTP semantics, and its design subsumes many of the features of HTTP semantics, and its design subsumes many of the features of
HTTP/2 [RFC7540]. HTTP/2 uses HPACK [RFC7541] for header HTTP/2 [RFC7540]. HTTP/2 uses HPACK [RFC7541] for header
compression. If HPACK were used for HTTP/3 [HTTP3], it would induce compression. If HPACK were used for HTTP/3 [HTTP3], it would induce
head-of-line blocking due to built-in assumptions of a total ordering head-of-line blocking due to built-in assumptions of a total ordering
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+----------------------------+------+---------------+---------------+ +----------------------------+------+---------------+---------------+
Table 3 Table 3
9. References 9. References
9.1. Normative References 9.1. Normative References
[HTTP3] Bishop, M., Ed., "Hypertext Transfer Protocol Version 3 [HTTP3] Bishop, M., Ed., "Hypertext Transfer Protocol Version 3
(HTTP/3)", Work in Progress, Internet-Draft, draft-ietf- (HTTP/3)", Work in Progress, Internet-Draft, draft-ietf-
quic-http-26, 21 February 2020, quic-http-27, 21 February 2020,
<https://tools.ietf.org/html/draft-ietf-quic-http-26>. <https://tools.ietf.org/html/draft-ietf-quic-http-27>.
[QUIC-TRANSPORT] [QUIC-TRANSPORT]
Iyengar, J., Ed. and M. Thomson, Ed., "QUIC: A UDP-Based Iyengar, J., Ed. and M. Thomson, Ed., "QUIC: A UDP-Based
Multiplexed and Secure Transport", Work in Progress, Multiplexed and Secure Transport", Work in Progress,
Internet-Draft, draft-ietf-quic-transport-26, 21 February Internet-Draft, draft-ietf-quic-transport-27, 21 February
2020, <https://tools.ietf.org/html/draft-ietf-quic- 2020, <https://tools.ietf.org/html/draft-ietf-quic-
transport-26>. transport-27>.
[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>.
[RFC7541] Peon, R. and H. Ruellan, "HPACK: Header Compression for [RFC7541] Peon, R. and H. Ruellan, "HPACK: Header Compression for
HTTP/2", RFC 7541, DOI 10.17487/RFC7541, May 2015, HTTP/2", RFC 7541, DOI 10.17487/RFC7541, May 2015,
<https://www.rfc-editor.org/info/rfc7541>. <https://www.rfc-editor.org/info/rfc7541>.
skipping to change at page 35, line 7 skipping to change at page 35, line 7
else: else:
encodeInteger(prefixBuffer, 0x80, encodeInteger(prefixBuffer, 0x80,
largestReference - baseIndex, 7) largestReference - baseIndex, 7)
return controlBuffer, prefixBuffer + streamBuffer return controlBuffer, prefixBuffer + streamBuffer
Appendix C. Change Log Appendix C. Change Log
*RFC Editor's Note:* Please remove this section prior to *RFC Editor's Note:* Please remove this section prior to
publication of a final version of this document. publication of a final version of this document.
C.1. Since draft-ietf-quic-qpack-12 C.1. Since draft-ietf-quic-qpack-13
No changes
C.2. Since draft-ietf-quic-qpack-12
Editorial changes only Editorial changes only
C.2. Since draft-ietf-quic-qpack-11 C.3. Since draft-ietf-quic-qpack-11
Editorial changes only Editorial changes only
C.3. Since draft-ietf-quic-qpack-10 C.4. Since draft-ietf-quic-qpack-10
Editorial changes only Editorial changes only
C.4. Since draft-ietf-quic-qpack-09 C.5. Since draft-ietf-quic-qpack-09
* Decoders MUST emit Header Acknowledgements (#2939) * Decoders MUST emit Header Acknowledgements (#2939)
* Updated error code for multiple encoder or decoder streams (#2970) * Updated error code for multiple encoder or decoder streams (#2970)
* Added explicit defaults for new SETTINGS (#2974) * Added explicit defaults for new SETTINGS (#2974)
C.5. Since draft-ietf-quic-qpack-08 C.6. Since draft-ietf-quic-qpack-08
* Endpoints are permitted to create encoder and decoder streams even * Endpoints are permitted to create encoder and decoder streams even
if they can't use them (#2100, #2529) if they can't use them (#2100, #2529)
* Maximum values for settings removed (#2766, #2767) * Maximum values for settings removed (#2766, #2767)
C.6. Since draft-ietf-quic-qpack-06 C.7. Since draft-ietf-quic-qpack-06
* Clarify initial dynamic table capacity maximums (#2276, #2330, * Clarify initial dynamic table capacity maximums (#2276, #2330,
#2330) #2330)
C.7. Since draft-ietf-quic-qpack-05 C.8. Since draft-ietf-quic-qpack-05
* Introduced the terms dynamic table capacity and maximum dynamic * Introduced the terms dynamic table capacity and maximum dynamic
table capacity. table capacity.
* Renamed SETTINGS_HEADER_TABLE_SIZE to * Renamed SETTINGS_HEADER_TABLE_SIZE to
SETTINGS_QPACK_MAX_TABLE_CAPACITY. SETTINGS_QPACK_MAX_TABLE_CAPACITY.
C.8. Since draft-ietf-quic-qpack-04 C.9. Since draft-ietf-quic-qpack-04
* Changed calculation of Delta Base Index to avoid an illegal value * Changed calculation of Delta Base Index to avoid an illegal value
(#2002, #2005) (#2002, #2005)
C.9. Since draft-ietf-quic-qpack-03 C.10. Since draft-ietf-quic-qpack-03
* Change HTTP settings defaults (#2038) * Change HTTP settings defaults (#2038)
* Substantial editorial reorganization * Substantial editorial reorganization
C.10. Since draft-ietf-quic-qpack-02 C.11. Since draft-ietf-quic-qpack-02
* Largest Reference encoded modulo MaxEntries (#1763) * Largest Reference encoded modulo MaxEntries (#1763)
* New Static Table (#1355) * New Static Table (#1355)
* Table Size Update with Insert Count=0 is a connection error * Table Size Update with Insert Count=0 is a connection error
(#1762) (#1762)
* Stream Cancellations are optional when * Stream Cancellations are optional when
SETTINGS_HEADER_TABLE_SIZE=0 (#1761) SETTINGS_HEADER_TABLE_SIZE=0 (#1761)
skipping to change at page 36, line 33 skipping to change at page 36, line 38
* Implementations must handle 62 bit integers (#1760) * Implementations must handle 62 bit integers (#1760)
* Different error types for each QPACK stream, other changes to * Different error types for each QPACK stream, other changes to
error handling (#1726) error handling (#1726)
* Preserve header field order (#1725) * Preserve header field order (#1725)
* Initial table size is the maximum permitted when table is first * Initial table size is the maximum permitted when table is first
usable (#1642) usable (#1642)
C.11. Since draft-ietf-quic-qpack-01 C.12. Since draft-ietf-quic-qpack-01
* Only header blocks that reference the dynamic table are * Only header blocks that reference the dynamic table are
acknowledged (#1603, #1605) acknowledged (#1603, #1605)
C.12. Since draft-ietf-quic-qpack-00 C.13. Since draft-ietf-quic-qpack-00
* Renumbered instructions for consistency (#1471, #1472) * Renumbered instructions for consistency (#1471, #1472)
* Decoder is allowed to validate largest reference (#1404, #1469) * Decoder is allowed to validate largest reference (#1404, #1469)
* Header block acknowledgments also acknowledge the associated * Header block acknowledgments also acknowledge the associated
largest reference (#1370, #1400) largest reference (#1370, #1400)
* Added an acknowledgment for unread streams (#1371, #1400) * Added an acknowledgment for unread streams (#1371, #1400)
* Removed framing from encoder stream (#1361,#1467) * Removed framing from encoder stream (#1361,#1467)
* Control streams use typed unidirectional streams rather than fixed * Control streams use typed unidirectional streams rather than fixed
stream IDs (#910,#1359) stream IDs (#910,#1359)
C.13. Since draft-ietf-quic-qcram-00 C.14. Since draft-ietf-quic-qcram-00
* Separate instruction sets for table updates and header blocks * Separate instruction sets for table updates and header blocks
(#1235, #1142, #1141) (#1235, #1142, #1141)
* Reworked indexing scheme (#1176, #1145, #1136, #1130, #1125, * Reworked indexing scheme (#1176, #1145, #1136, #1130, #1125,
#1314) #1314)
* Added mechanisms that support one-pass encoding (#1138, #1320) * Added mechanisms that support one-pass encoding (#1138, #1320)
* Added a setting to control the number of blocked decoders (#238, * Added a setting to control the number of blocked decoders (#238,
 End of changes. 19 change blocks. 
32 lines changed or deleted 36 lines changed or added

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