Network Working Group M. Nottingham Request for Comments: 4229 J. Mogul Category: Informational HP Labs December 2005 HTTP Header Field Registrations Status of This Memo This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited. Copyright Notice Copyright (C) The Internet Society (2005).Abstract
This document defines the initial contents of a permanent IANA registry for HTTP header fields and a provisional repository for HTTP header fields, per RFC 3864.Table of Contents
1. Introduction ....................................................4 2. Registration Templates ..........................................4 2.1. Permanent HTTP Header Field Registrations ..................5 2.1.1. Header field: A-IM ....................................7 2.1.2. Header field: Accept ..................................8 2.1.3. Header field: Accept-Additions ........................8 2.1.4. Header field: Accept-Charset ..........................8 2.1.5. Header field: Accept-Encoding .........................9 2.1.6. Header field: Accept-Features .........................9 2.1.7. Header field: Accept-Language .........................9 2.1.8. Header field: Accept-Ranges ..........................10 2.1.9. Header field: Age ....................................10 2.1.10. Header field: Allow .................................10 2.1.11. Header field: Alternates ............................10 2.1.12. Header field: Authentication-Info ...................11 2.1.13. Header field: Authorization .........................11 2.1.14. Header field: C-Ext .................................11 2.1.15. Header field: C-Man .................................12 2.1.16. Header field: C-Opt .................................12 2.1.17. Header field: C-PEP .................................12 2.1.18. Header field: C-PEP-Info ............................13 2.1.19. Header field: Cache-Control .........................13 2.1.20. Header field: Connection ............................13
2.1.21. Header field: Content-Base ..........................14 2.1.22. Header field: Content-Disposition ...................14 2.1.23. Header field: Content-Encoding ......................14 2.1.24. Header field: Content-ID ............................14 2.1.25. Header field: Content-Language ......................15 2.1.26. Header field: Content-Length ........................15 2.1.27. Header field: Content-Location ......................15 2.1.28. Header field: Content-MD5 ...........................16 2.1.29. Header field: Content-Range .........................16 2.1.30. Header field: Content-Script-Type ...................16 2.1.31. Header field: Content-Style-Type ....................17 2.1.32. Header field: Content-Type ..........................17 2.1.33. Header field: Content-Version .......................17 2.1.34. Header field: Cookie ................................17 2.1.35. Header field: Cookie2 ...............................18 2.1.36. Header field: DAV ...................................18 2.1.37. Header field: Date ..................................18 2.1.38. Header field: Default-Style .........................19 2.1.39. Header field: Delta-Base ............................19 2.1.40. Header field: Depth .................................19 2.1.41. Header field: Derived-From ..........................19 2.1.42. Header field: Destination ...........................20 2.1.43. Header field: Differential-ID .......................20 2.1.44. Header field: Digest ................................20 2.1.45. Header field: ETag ..................................21 2.1.46. Header field: Expect ................................21 2.1.47. Header field: Expires ...............................21 2.1.48. Header field: Ext ...................................22 2.1.49. Header field: From ..................................22 2.1.50. Header field: GetProfile ............................22 2.1.51. Header field: Host ..................................23 2.1.52. Header field: IM ....................................23 2.1.53. Header field: If ....................................23 2.1.54. Header field: If-Match ..............................23 2.1.55. Header field: If-Modified-Since .....................24 2.1.56. Header field: If-None-Match .........................24 2.1.57. Header field: If-Range ..............................24 2.1.58. Header field: If-Unmodified-Since ...................25 2.1.59. Header field: Keep-Alive ............................25 2.1.60. Header field: Label .................................25 2.1.61. Header field: Last-Modified .........................25 2.1.62. Header field: Link ..................................26 2.1.63. Header field: Location ..............................26 2.1.64. Header field: Lock-Token ............................26 2.1.65. Header field: MIME-Version ..........................27 2.1.66. Header field: Man ...................................27 2.1.67. Header field: Max-Forwards ..........................27 2.1.68. Header field: Meter .................................27
2.1.69. Header field: Negotiate .............................28 2.1.70. Header field: Opt ...................................28 2.1.71. Header field: Ordering-Type .........................28 2.1.72. Header field: Overwrite .............................29 2.1.73. Header field: P3P ...................................29 2.1.74. Header field: PEP ...................................29 2.1.75. Header field: PICS-Label ............................30 2.1.76. Header field: Pep-Info ..............................30 2.1.77. Header field: Position ..............................30 2.1.78. Header field: Pragma ................................31 2.1.79. Header field: ProfileObject .........................31 2.1.80. Header field: Protocol ..............................31 2.1.81. Header field: Protocol-Info .........................32 2.1.82. Header field: Protocol-Query ........................32 2.1.83. Header field: Protocol-Request ......................32 2.1.84. Header field: Proxy-Authenticate ....................32 2.1.85. Header field: Proxy-Authentication-Info .............33 2.1.86. Header field: Proxy-Authorization ...................33 2.1.87. Header field: Proxy-Features ........................33 2.1.88. Header field: Proxy-Instruction .....................34 2.1.89. Header field: Public ................................34 2.1.90. Header field: Range .................................34 2.1.91. Header field: Referer ...............................34 2.1.92. Header field: Retry-After ...........................35 2.1.93. Header field: Safe ..................................35 2.1.94. Header field: Security-Scheme .......................35 2.1.95. Header field: Server ................................36 2.1.96. Header field: Set-Cookie ............................36 2.1.97. Header field: Set-Cookie2 ...........................36 2.1.98. Header field: SetProfile ............................36 2.1.99. Header field: SoapAction ............................37 2.1.100. Header field: Status-URI ...........................37 2.1.101. Header field: Surrogate-Capability .................38 2.1.102. Header field: Surrogate-Control ....................38 2.1.103. Header field: TCN ..................................38 2.1.104. Header field: TE ...................................39 2.1.105. Header field: Timeout ..............................39 2.1.106. Header field: Trailer ..............................39 2.1.107. Header field: Transfer-Encoding ....................39 2.1.108. Header field: URI ..................................40 2.1.109. Header field: Upgrade ..............................40 2.1.110. Header field: User-Agent ...........................40 2.1.111. Header field: Variant-Vary .........................41 2.1.112. Header field: Vary .................................41 2.1.113. Header field: Via ..................................41 2.1.114. Header field: WWW-Authenticate .....................41 2.1.115. Header field: Want-Digest ..........................42 2.1.116. Header field: Warning ..............................42
2.2. Provisional HTTP Header Field Submissions .................43 2.2.1. Header field: Compliance .............................43 2.2.2. Header field: Content-Transfer-Encoding ..............43 2.2.3. Header field: Cost ...................................44 2.2.4. Header field: Message-ID .............................44 2.2.5. Header field: Non-Compliance .........................44 2.2.6. Header field: Optional ...............................44 2.2.7. Header field: Resolution-Hint ........................45 2.2.8. Header field: Resolver-Location ......................45 2.2.9. Header field: SubOK ..................................46 2.2.10. Header field: Subst .................................46 2.2.11. Header field: Title .................................46 2.2.12. Header field: UA-Color ..............................46 2.2.13. Header field: UA-Media ..............................47 2.2.14. Header field: UA-Pixels .............................47 2.2.15. Header field: UA-Resolution .........................48 2.2.16. Header field: UA-Windowpixels .......................48 2.2.17. Header field: Version ...............................48 3. IANA Considerations ............................................49 4. Security Considerations ........................................49 5. Acknowledgements ...............................................49 6. Informative References .........................................491. Introduction
HTTP/1.0 [3] and HTTP/1.1 [11] define protocol constructs (respectively, the HTTP-header and message-header BNF rules) that are used as message headers. These specifications also define a number of HTTP headers themselves, and they provide for extension through the use of new field-names. This document defines the initial contents of an IANA registry that catalogs permanent HTTP header field-names, and of an IANA repository that catalogs provisional HTTP header field-names. Both are operated according to Registration Procedures for Message Header Fields [1]. Note that neither tracks the syntax or semantics of field-values. Also, while some HTTP headers have different semantics depending on their context (e.g., Cache-Control in requests and responses), both registries consider the HTTP header field-name name space singular. Also, some contact details listed may no longer be correct.2. Registration Templates
Header field entries are summarized in tabular form for convenience of reference and presented in full in the following sections.
2.1. Permanent HTTP Header Field Registrations
Header name Protocol ----------- -------- A-IM http Accept http Accept-Additions http Accept-Charset http Accept-Encoding http Accept-Features http Accept-Language http Accept-Ranges http Age http Allow http Alternates http Authentication-Info http Authorization http C-Ext http C-Man http C-Opt http C-PEP http C-PEP-Info http Cache-Control http Connection http Content-Base http Content-Disposition http Content-Encoding http Content-ID http Content-Language http Content-Length http Content-Location http Content-MD5 http Content-Range http Content-Script-Type http Content-Style-Type http Content-Type http Content-Version http Cookie http Cookie2 http DAV http Date http Default-Style http Delta-Base http Depth http Derived-From http Destination http Differential-ID http Digest http
ETag http Expect http Expires http Ext http From http GetProfile http Host http IM http If http If-Match http If-Modified-Since http If-None-Match http If-Range http If-Unmodified-Since http Keep-Alive http Label http Last-Modified http Link http Location http Lock-Token http MIME-Version http Man http Max-Forwards http Meter http Negotiate http Opt http Ordering-Type http Overwrite http P3P http PEP http PICS-Label http Pep-Info http Position http Pragma http ProfileObject http Protocol http Protocol-Info http Protocol-Query http Protocol-Request http Proxy-Authenticate http Proxy-Authentication-Info http Proxy-Authorization http Proxy-Features http Proxy-Instruction http Public http Range http Referer http Retry-After http
Safe http Security-Scheme http Server http Set-Cookie http Set-Cookie2 http SetProfile http SoapAction http Status-URI http Surrogate-Capability http Surrogate-Control http TCN http TE http Timeout http Trailer http Transfer-Encoding http URI http Upgrade http User-Agent http Variant-Vary http Vary http Via http WWW-Authenticate http Want-Digest http Warning http2.1.1. Header field: A-IM
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC3229 [16]
2.1.2. Header field: Accept
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.3. Header field: Accept-Additions
Applicable protocol: http [11] Status: informational Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2324 [9] Related information: spoof2.1.4. Header field: Accept-Charset
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]
2.1.5. Header field: Accept-Encoding
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.6. Header field: Accept-Features
Applicable protocol: http [11] Status: experimental Author/change controller: Andrew H. Mutz (mutz@hpl.hp.com) Koen Holtman (koen@win.tue.nl) Specification document(s): RFC2295 [7]2.1.7. Header field: Accept-Language
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]
2.1.8. Header field: Accept-Ranges
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.9. Header field: Age
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.10. Header field: Allow
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.11. Header field: Alternates
Applicable protocol: http [11] Status: experimental
Author/change controller: Andrew H. Mutz (mutz@hpl.hp.com) Koen Holtman (koen@win.tue.nl) Specification document(s): RFC2295 [7]2.1.12. Header field: Authentication-Info
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2617 [12]2.1.13. Header field: Authorization
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.14. Header field: C-Ext
Applicable protocol: http [11] Status: experimental Author/change controller: Henrik Frystyk Nielsen (frystyk@microsoft.com) Paul J. Leach (paulle@microsoft.com) Scott Lawrence (lawrence@agranat.com) Specification document(s): RFC2774 [14]
2.1.15. Header field: C-Man
Applicable protocol: http [11] Status: experimental Author/change controller: Henrik Frystyk Nielsen (frystyk@microsoft.com) Paul J. Leach (paulle@microsoft.com) Scott Lawrence (lawrence@agranat.com) Specification document(s): RFC2774 [14]2.1.16. Header field: C-Opt
Applicable protocol: http [11] Status: experimental Author/change controller: Henrik Frystyk Nielsen (frystyk@microsoft.com) Paul J. Leach (paulle@microsoft.com) Scott Lawrence (lawrence@agranat.com) Specification document(s): RFC2774 [14]2.1.17. Header field: C-PEP
Applicable protocol: http [11] Status: deprecated Author/change controller: Henrik Frystyk Nielsen (frystyk@w3.org) World Wide Web Consortium, MIT Laboratory for Computer Science Dan Connolly (connolly@w3.org) World Wide Web Consortium, MIT Laboratory for Computer Science Rohit Khare (khare@w3.org) World Wide Web Consortium, MIT Laboratory for Computer Science Eric Prud'hommeaux (eric@w3.org) World Wide Web Consortium, MIT Laboratory for Computer Science Specification document(s): PEP [29]
2.1.18. Header field: C-PEP-Info
Applicable protocol: http [11] Status: deprecated Author/change controller: Henrik Frystyk Nielsen (frystyk@w3.org) World Wide Web Consortium, MIT Laboratory for Computer Science Dan Connolly (connolly@w3.org) World Wide Web Consortium, MIT Laboratory for Computer Science Rohit Khare (khare@w3.org) World Wide Web Consortium, MIT Laboratory for Computer Science Eric Prud'hommeaux (eric@w3.org) World Wide Web Consortium, MIT Laboratory for Computer Science Specification document(s): PEP [29]2.1.19. Header field: Cache-Control
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.20. Header field: Connection
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]
2.1.21. Header field: Content-Base
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2068 [4]2.1.22. Header field: Content-Disposition
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.23. Header field: Content-Encoding
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.24. Header field: Content-ID
Applicable protocol: http [11] Status: informational
Author/change controller: Arthur van Hoff (avh@marimba.com) Marimba Inc. John Giannandrea (jg@netscape.com) Netscape Inc. Mark Hapner (mark.hapner@sun.com) Sun Microsystems Inc. Steve Carter (srcarter@novell.com) Novell Inc. Milo Medin (medin@home.net) At Home Corp Specification document(s): DRP [20]2.1.25. Header field: Content-Language
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.26. Header field: Content-Length
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.27. Header field: Content-Location
Applicable protocol: http [11] Status: standard
Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.28. Header field: Content-MD5
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.29. Header field: Content-Range
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.30. Header field: Content-Script-Type
Applicable protocol: http [11] Status: standard Author/change controller: W3C (web-human@w3.org) World Wide Web Consortium Specification document(s): HTML 4 [21]
2.1.31. Header field: Content-Style-Type
Applicable protocol: http [11] Status: standard Author/change controller: W3C (web-human@w3.org) World Wide Web Consortium Specification document(s): HTML 4 [21]2.1.32. Header field: Content-Type
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.33. Header field: Content-Version
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2068 [4]2.1.34. Header field: Cookie
Applicable protocol: http [11] Status: standard
Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2965 [15]2.1.35. Header field: Cookie2
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2965 [15]2.1.36. Header field: DAV
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2518 [10]2.1.37. Header field: Date
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]
2.1.38. Header field: Default-Style
Applicable protocol: http [11] Status: standard Author/change controller: W3C (web-human@w3.org) World Wide Web Consortium Specification document(s): HTML 4 [21]2.1.39. Header field: Delta-Base
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC3229 [16]2.1.40. Header field: Depth
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2518 [10]2.1.41. Header field: Derived-From
Applicable protocol: http [11] Status: standard
Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2068 [4]2.1.42. Header field: Destination
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2518 [10]2.1.43. Header field: Differential-ID
Applicable protocol: http [11] Status: informational Author/change controller: Arthur van Hoff (avh@marimba.com) Marimba Inc. John Giannandrea (jg@netscape.com) Netscape Inc. Mark Hapner (mark.hapner@sun.com) Sun Microsystems Inc. Steve Carter (srcarter@novell.com) Novell Inc. Milo Medin (medin@home.net) At Home Corp Specification document(s): DRP [20]2.1.44. Header field: Digest
Applicable protocol: http [11] Status: standard
Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC3230 [17]2.1.45. Header field: ETag
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.46. Header field: Expect
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.47. Header field: Expires
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]
2.1.48. Header field: Ext
Applicable protocol: http [11] Status: experimental Author/change controller: Henrik Frystyk Nielsen (frystyk@microsoft.com) Paul J. Leach (paulle@microsoft.com) Scott Lawrence (lawrence@agranat.com) Specification document(s): RFC2774 [14]2.1.49. Header field: From
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.50. Header field: GetProfile
Applicable protocol: http [11] Status: informational Author/change controller: Pat Hensley (hensley@firefly.net) FireFly Network, Inc. Max Metral (max@firefly.net) FireFly Network, Inc. Upendra Shardanand (shard@firefly.net) FireFly Network, Inc. Donna Converse (converse@netscape.com) Netscape Communications Mike Myers (mmyers@verisign.com) Verisign, Inc. Specification document(s): OPS over HTTP [22]
2.1.51. Header field: Host
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.52. Header field: IM
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC3229 [16]2.1.53. Header field: If
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2518 [10]2.1.54. Header field: If-Match
Applicable protocol: http [11] Status: standard
Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.55. Header field: If-Modified-Since
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.56. Header field: If-None-Match
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.57. Header field: If-Range
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]
2.1.58. Header field: If-Unmodified-Since
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.59. Header field: Keep-Alive
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2068 [4]2.1.60. Header field: Label
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC3253 [18]2.1.61. Header field: Last-Modified
Applicable protocol: http [11] Status: standard
Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.62. Header field: Link
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2068 [4]2.1.63. Header field: Location
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.64. Header field: Lock-Token
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2518 [10]
2.1.65. Header field: MIME-Version
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.66. Header field: Man
Applicable protocol: http [11] Status: experimental Author/change controller: Henrik Frystyk Nielsen (frystyk@microsoft.com) Paul J. Leach (paulle@microsoft.com) Scott Lawrence (lawrence@agranat.com) Specification document(s): RFC2774 [14]2.1.67. Header field: Max-Forwards
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.68. Header field: Meter
Applicable protocol: http [11] Status: standard
Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2227 [6]2.1.69. Header field: Negotiate
Applicable protocol: http [11] Status: experimental Author/change controller: Andrew H. Mutz (mutz@hpl.hp.com) Koen Holtman (koen@win.tue.nl) Specification document(s): RFC2295 [7]2.1.70. Header field: Opt
Applicable protocol: http [11] Status: experimental Author/change controller: Henrik Frystyk Nielsen (frystyk@microsoft.com) Paul J. Leach (paulle@microsoft.com) Scott Lawrence (lawrence@agranat.com) Specification document(s): RFC2774 [14]2.1.71. Header field: Ordering-Type
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC3648 [19]
2.1.72. Header field: Overwrite
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2518 [10]2.1.73. Header field: P3P
Applicable protocol: http [11] Status: standard Author/change controller: W3C (web-human@w3.org) World Wide Web Consortium Specification document(s): P3P [23]2.1.74. Header field: PEP
Applicable protocol: http [11] Status: deprecated Author/change controller: Henrik Frystyk Nielsen (frystyk@w3.org) World Wide Web Consortium, MIT Laboratory for Computer Science Dan Connolly (connolly@w3.org) World Wide Web Consortium, MIT Laboratory for Computer Science Rohit Khare (khare@w3.org) World Wide Web Consortium, MIT Laboratory for Computer Science Eric Prud'hommeaux (eric@w3.org) World Wide Web Consortium, MIT Laboratory for Computer Science Specification document(s): PEP [29]
2.1.75. Header field: PICS-Label
Applicable protocol: http [11] Status: standard Author/change controller: W3C (web-human@w3.org) World Wide Web Consortium Specification document(s): PICSLabels [24]2.1.76. Header field: Pep-Info
Applicable protocol: http [11] Status: deprecated Author/change controller: Henrik Frystyk Nielsen (frystyk@w3.org) World Wide Web Consortium, MIT Laboratory for Computer Science Dan Connolly (connolly@w3.org) World Wide Web Consortium, MIT Laboratory for Computer Science Rohit Khare (khare@w3.org) World Wide Web Consortium, MIT Laboratory for Computer Science Eric Prud'hommeaux (eric@w3.org) World Wide Web Consortium, MIT Laboratory for Computer Science Specification document(s): PEP [29]2.1.77. Header field: Position
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC3648 [19]
2.1.78. Header field: Pragma
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.79. Header field: ProfileObject
Applicable protocol: http [11] Status: informational Author/change controller: Pat Hensley (hensley@firefly.net) FireFly Network, Inc. Max Metral (max@firefly.net) FireFly Network, Inc. Upendra Shardanand (shard@firefly.net) FireFly Network, Inc. Donna Converse (converse@netscape.com) Netscape Communications Mike Myers (mmyers@verisign.com) Verisign, Inc. Specification document(s): OPS over HTTP [22]2.1.80. Header field: Protocol
Applicable protocol: http [11] Status: standard Author/change controller: W3C (web-human@w3.org) World Wide Web Consortium Specification document(s): PICSLabels [24]
2.1.81. Header field: Protocol-Info
Applicable protocol: http [11] Status: deprecated Author/change controller: Don Eastlake (dee@cybercash.com) Rohit Khare (khare@w3.org) Jim Miller (jmiller@w3.org) Specification document(s): Selecting Payment Mechanisms [26]2.1.82. Header field: Protocol-Query
Applicable protocol: http [11] Status: deprecated Author/change controller: Don Eastlake (dee@cybercash.com) Rohit Khare (khare@w3.org) Jim Miller (jmiller@w3.org) Specification document(s): Selecting Payment Mechanisms [26]2.1.83. Header field: Protocol-Request
Applicable protocol: http [11] Status: standard Author/change controller: W3C (web-human@w3.org) World Wide Web Consortium Specification document(s): PICSLabels [24]2.1.84. Header field: Proxy-Authenticate
Applicable protocol: http [11] Status: standard
Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.85. Header field: Proxy-Authentication-Info
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2617 [12]2.1.86. Header field: Proxy-Authorization
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.87. Header field: Proxy-Features
Applicable protocol: http [11] Status: informational Author/change controller: Phillip M. Hallam-Baker (hallam@w3.org) W3C Specification document(s): Proxy Notification [27]
2.1.88. Header field: Proxy-Instruction
Applicable protocol: http [11] Status: informational Author/change controller: Phillip M. Hallam-Baker (hallam@w3.org) W3C Specification document(s): Proxy Notification [27]2.1.89. Header field: Public
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2068 [4]2.1.90. Header field: Range
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.91. Header field: Referer
Applicable protocol: http [11] Status: standard
Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.92. Header field: Retry-After
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.93. Header field: Safe
Applicable protocol: http [11] Status: experimental Author/change controller: Koen Holtman (koen@win.tue.nl) Specification document(s): RFC2310 [8]2.1.94. Header field: Security-Scheme
Applicable protocol: http [11] Status: experimental Author/change controller: Eric Rescorla (ekr@rtfm.com) A. Schiffman (ams@terisa.com) Specification document(s): RFC2660 [13]
2.1.95. Header field: Server
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.96. Header field: Set-Cookie
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2109 [5]2.1.97. Header field: Set-Cookie2
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2965 [15]2.1.98. Header field: SetProfile
Applicable protocol: http [11] Status: informational
Author/change controller: Pat Hensley (hensley@firefly.net) FireFly Network, Inc. Max Metral (max@firefly.net) FireFly Network, Inc. Upendra Shardanand (shard@firefly.net) FireFly Network, Inc. Donna Converse (converse@netscape.com) Netscape Communications Mike Myers (mmyers@verisign.com) Verisign, Inc. Specification document(s): OPS over HTTP [22]2.1.99. Header field: SoapAction
Applicable protocol: http [11] Status: informational Author/change controller: Don Box (dbox@develop.com) DevelopMentor David Ehnebuske (davide@us.ibm.com) IBM Gopal Kakivaya (gopalk@microsoft.com) Microsoft Andrew Layman (andrewl@microsoft.com) Microsoft Noah Mendelsohn (Noah_Mendelsohn@lotus.com) Lotus Development Corp. Hernik Frystyk Nielsen (frystyk@microsoft.com) Microsoft Satish Thatte (satisht@microsoft.com) Microsoft Dave Winer (dave@userland.com) UserLand Software, Inc. Specification document(s): SOAP [28]2.1.100. Header field: Status-URI
Applicable protocol: http [11] Status: standard
Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2518 [10]2.1.101. Header field: Surrogate-Capability
Applicable protocol: http [11] Status: informational Author/change controller: Mark Nottingham (mnot@akamai.com) Akamai Xiang Liu (xiang.liu@oracle.com) Oracle Specification document(s): edge-arch [25]2.1.102. Header field: Surrogate-Control
Applicable protocol: http [11] Status: informational Author/change controller: Mark Nottingham (mnot@akamai.com) Akamai Xiang Liu (xiang.liu@oracle.com) Oracle Specification document(s): edge-arch [25]2.1.103. Header field: TCN
Applicable protocol: http [11] Status: experimental Author/change controller: Andrew H. Mutz (mutz@hpl.hp.com) Koen Holtman (koen@win.tue.nl)
Specification document(s): RFC2295 [7]2.1.104. Header field: TE
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.105. Header field: Timeout
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2518 [10]2.1.106. Header field: Trailer
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.107. Header field: Transfer-Encoding
Applicable protocol: http [11] Status: standard
Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.108. Header field: URI
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2068 [4]2.1.109. Header field: Upgrade
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.110. Header field: User-Agent
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]
2.1.111. Header field: Variant-Vary
Applicable protocol: http [11] Status: experimental Author/change controller: Andrew H. Mutz (mutz@hpl.hp.com) Koen Holtman (koen@win.tue.nl) Specification document(s): RFC2295 [7]2.1.112. Header field: Vary
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.113. Header field: Via
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.114. Header field: WWW-Authenticate
Applicable protocol: http [11] Status: standard
Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]2.1.115. Header field: Want-Digest
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC3230 [17]2.1.116. Header field: Warning
Applicable protocol: http [11] Status: standard Author/change controller: IETF (iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC2616 [11]
2.2. Provisional HTTP Header Field Submissions
Header name Protocol ----------- -------- Compliance http Content-Transfer-Encoding http Cost http Message-ID http Non-Compliance http Optional http Resolution-Hint http Resolver-Location http SubOK http Subst http Title http UA-Color http UA-Media http UA-Pixels http UA-Resolution http UA-Windowpixels http Version http2.2.1. Header field: Compliance
Applicable protocol: http [11] Status: provisional Author/change controller: Jeffrey C. Mogul (mogul@wrl.dec.com) Western Research Laboratory, Digital Equipment Corporation Josh Cohen (josh@netscape.com) Netscape Communications Corporation Scott Lawrence (lawrence@agranat.com) Agranat Systems, Inc. Specification document(s): OPTIONS messages [31]2.2.2. Header field: Content-Transfer-Encoding
Applicable protocol: http [11] Status: provisional Author/change controller: Tim Berners-Lee (timbl@w3.org) MIT Laboratory for Computer Science
Specification document(s): Object Headers [2]2.2.3. Header field: Cost
Applicable protocol: http [11] Status: provisional Author/change controller: Tim Berners-Lee (timbl@w3.org) MIT Laboratory for Computer Science Specification document(s): Object Headers [2]2.2.4. Header field: Message-ID
Applicable protocol: http [11] Status: provisional Author/change controller: Tim Berners-Lee (timbl@w3.org) MIT Laboratory for Computer Science Specification document(s): Object Headers [2]2.2.5. Header field: Non-Compliance
Applicable protocol: http [11] Status: provisional Author/change controller: Jeffrey C. Mogul (mogul@wrl.dec.com) Western Research Laboratory, Digital Equipment Corporation Josh Cohen (josh@netscape.com) Netscape Communications Corporation Scott Lawrence (lawrence@agranat.com) Agranat Systems, Inc. Specification document(s): OPTIONS messages [31]2.2.6. Header field: Optional
Applicable protocol: http [11] Status: provisional
Author/change controller: John Mallery (jcma@ai.mit.edu) MIT Artificial Intelligence Laboratory Lewis Girod (girod@lcs.mit.edu) MIT Laboratory for Computer Science Benjie Chen (benjie@lcs.mit.edu) MIT Laboratory for Computer Science Henrik Frystyk Nielsen (frystyk@w3.org) World Wide Web Consortium Specification document(s): WIRE [32]2.2.7. Header field: Resolution-Hint
Applicable protocol: http [11] Status: provisional Author/change controller: John Mallery (jcma@ai.mit.edu) MIT Artificial Intelligence Laboratory Lewis Girod (girod@lcs.mit.edu) MIT Laboratory for Computer Science Benjie Chen (benjie@lcs.mit.edu) MIT Laboratory for Computer Science Henrik Frystyk Nielsen (frystyk@w3.org) World Wide Web Consortium Specification document(s): WIRE [32]2.2.8. Header field: Resolver-Location
Applicable protocol: http [11] Status: provisional Author/change controller: John Mallery (jcma@ai.mit.edu) MIT Artificial Intelligence Laboratory Lewis Girod (girod@lcs.mit.edu) MIT Laboratory for Computer Science Benjie Chen (benjie@lcs.mit.edu) MIT Laboratory for Computer Science Henrik Frystyk Nielsen (frystyk@w3.org) World Wide Web Consortium
Specification document(s): WIRE [32]2.2.9. Header field: SubOK
Applicable protocol: http [11] Status: provisional Author/change controller: Jeffrey C. Mogul (mogul@wrl.dec.com) Western Research Laboratory, Digital Equipment Corporation Arthur van Hoff (avh@marimba.com) Marimba, Inc. Specification document(s): Duplicate Suppression [33]2.2.10. Header field: Subst
Applicable protocol: http [11] Status: provisional Author/change controller: Jeffrey C. Mogul (mogul@wrl.dec.com) Western Research Laboratory, Digital Equipment Corporation Arthur van Hoff (avh@marimba.com) Marimba, Inc. Specification document(s): Duplicate Suppression [33]2.2.11. Header field: Title
Applicable protocol: http [11] Status: provisional Author/change controller: Tim Berners-Lee (timbl@w3.org) MIT Laboratory for Computer Science Specification document(s): Object Headers [2]2.2.12. Header field: UA-Color
Applicable protocol: http [11] Status: provisional
Author/change controller: Larry Masinter (LMM@acm.org) Adobe Systems Lou Montulli (montulli@netscape.com) Netscape Communications Corp. Andrew H. Mutz (mutz@hpl.hp.com) Hewlett-Packard Company Specification document(s): UA Attributes [30]2.2.13. Header field: UA-Media
Applicable protocol: http [11] Status: provisional Author/change controller: Larry Masinter (LMM@acm.org) Adobe Systems Lou Montulli (montulli@netscape.com) Netscape Communications Corp. Andrew H. Mutz (mutz@hpl.hp.com) Hewlett-Packard Company Specification document(s): UA Attributes [30]2.2.14. Header field: UA-Pixels
Applicable protocol: http [11] Status: provisional Author/change controller: Larry Masinter (LMM@acm.org) Adobe Systems Lou Montulli (montulli@netscape.com) Netscape Communications Corp. Andrew H. Mutz (mutz@hpl.hp.com) Hewlett-Packard Company Specification document(s): UA Attributes [31]
2.2.15. Header field: UA-Resolution
Applicable protocol: http [11] Status: provisional Author/change controller: Larry Masinter (LMM@acm.org) Adobe Systems Lou Montulli (montulli@netscape.com) Netscape Communications Corp. Andrew H. Mutz (mutz@hpl.hp.com) Hewlett-Packard Company Specification document(s): UA Attributes [30]2.2.16. Header field: UA-Windowpixels
Applicable protocol: http [11] Status: provisional Author/change controller: Larry Masinter (LMM@acm.org) Adobe Systems Lou Montulli (montulli@netscape.com) Netscape Communications Corp. Andrew H. Mutz (mutz@hpl.hp.com) Hewlett-Packard Company Specification document(s): UA Attributes [30]2.2.17. Header field: Version
Applicable protocol: http [11] Status: provisional Author/change controller: Tim Berners-Lee (timbl@w3.org) MIT Laboratory for Computer Science Specification document(s): Object Headers [2]
3. IANA Considerations
This specification provides initial registrations of HTTP header fields in the "Permanent Message Header Field Registry", defined by Registration Procedures for Message Header Fields [1]. It also provides initial submissions of HTTP header fields in the "Provisional Message Header Field Repository", defined by the same document.4. Security Considerations
No security considerations are introduced by this document beyond those already inherent in use of the HTTP header fields referenced.5. Acknowledgements
The authors would like to thank Graham Klyne for his work in defining the message header registries, his input and help in preparing this document, and the registry generation software.6. Informative References
[1] Klyne, G., Nottingham, M., and J. Mogul, "Registration Procedures for Message Header Fields", BCP 90, RFC 3864, September 2004. [2] Berners-Lee, T., "Object Header lines in HTTP", May 1994, <http://www.w3.org/Protocols/HTTP/Object_Headers.html>. [3] Berners-Lee, T., Fielding, R., and H. Nielsen, "Hypertext Transfer Protocol -- HTTP/1.0", RFC 1945, May 1996. [4] Fielding, R., Gettys, J., Mogul, J., Nielsen, H., and T. Berners-Lee, "Hypertext Transfer Protocol -- HTTP/1.1", RFC 2068, January 1997. [5] Kristol, D. and L. Montulli, "HTTP State Management Mechanism", RFC 2109, February 1997. [6] Mogul, J. and P. Leach, "Simple Hit-Metering and Usage-Limiting for HTTP", RFC 2227, October 1997. [7] Holtman, K. and A. Mutz, "Transparent Content Negotiation in HTTP", RFC 2295, March 1998. [8] Holtman, K., "The Safe Response Header Field", RFC 2310, April 1998.
[9] Masinter, L., "Hyper Text Coffee Pot Control Protocol (HTCPCP/1.0)", RFC 2324, April 1998. [10] Goland, Y., Whitehead, E., Faizi, A., Carter, S., and D. Jensen, "HTTP Extensions for Distributed Authoring -- WEBDAV", RFC 2518, February 1999. [11] Fielding, R., Gettys, J., Mogul, J., Frystyk, H., Masinter, L., Leach, P., and T. Berners-Lee, "Hypertext Transfer Protocol -- HTTP/1.1", RFC 2616, June 1999. [12] Franks, J., Hallam-Baker, P., Hostetler, J., Lawrence, S., Leach, P., Luotonen, A., and L. Stewart, "HTTP Authentication: Basic and Digest Access Authentication", RFC 2617, June 1999. [13] Rescorla, E. and A. Schiffman, "The Secure HyperText Transfer Protocol", RFC 2660, August 1999. [14] Nielsen, H., Leach, P., and S. Lawrence, "An HTTP Extension Framework", RFC 2774, February 2000. [15] Kristol, D. and L. Montulli, "HTTP State Management Mechanism", RFC 2965, October 2000. [16] Mogul, J., Krishnamurthy, B., Douglis, F., Feldmann, A., Goland, Y., van Hoff, A., and D. Hellerstein, "Delta encoding in HTTP", RFC 3229, January 2002. [17] Mogul, J. and A. Van Hoff, "Instance Digests in HTTP", RFC 3230, January 2002. [18] Clemm, G., Amsden, J., Ellison, T., Kaler, C., and J. Whitehead, "Versioning Extensions to WebDAV (Web Distributed Authoring and Versioning)", RFC 3253, March 2002. [19] Whitehead, J. and J. Reschke, Ed., "Web Distributed Authoring and Versioning (WebDAV) Ordered Collections Protocol", RFC 3648, December 2003. [20] Hoff, A., Payne, J., Hapner, M., Carter, S., and M. Medin, "The HTTP Distribution and Replication Protocol", W3C NOTE NOTE- drp-19970825, August 1997. [21] Raggett, D., Hors, A., and I. Jacobs, "HTML 4.01 Specification", W3C REC REC-html401-19991224, December 1999.
[22] Hensley, P., Metral, M., Shardanand, U., Converse, D., and M. Myers, "Implementation of OPS Over HTTP", W3C NOTE NOTE-OPS- OverHTTP, June 1997. [23] Marchiori, M., "The Platform for Privacy Preferences 1.0 (P3P1.0) Specification", W3C REC REC-P3P-20020416, April 2002. [24] Krauskopf, T., Miller, J., Resnick, P., and W. Treese, "PICS 1.1 Label Distribution -- Label Syntax and Communication Protocols", W3C REC REC-PICS-labels-961031, October 1996. [25] Nottingham, M. and X. Liu, "Edge Architecture Specification", W3C NOTE NOTE-edge-arch-20010804, August 2001. [26] Chung, E. and D. Dardailler, "White Paper: Joint Electronic Payment Initiative", W3C NOTE NOTE-jepi-970519, May 1997. [27] Hallam-Baker, P., "Notification for Proxy Caches", W3C NOTE WD- proxy-960221, February 1996. [28] Box, D., Ehnebuske, D., Kakivaya, G., Layman, A., Mendelsohn, N., Nielsen, H., Thatte, S., and D. Winer, "Simple Object Access Protocol (SOAP) 1.1", W3C NOTE NOTE-SOAP-20000508, May 2000. [29] Connolly, D., Prod'hommeaux, E., Nielsen, H., and R. Khare, "PEP Specification: an Extension Mechanism for HTTP", Nov 1998, <http://www.w3.org/TR/WD-http-pep>. [30] Masinter, L., Montulli, L., and A. Mutz, "User-Agent Display Attributes Headers", Work in Progress, November 1996. [31] Mogul, J., Cohen, J., and S. Lawrence, "Specification of HTTP/1.1 OPTIONS messages", Work in Progress, August 1997. [32] Girod, L., Chen, B., Henrik, H., and J. Mallery, "WIRE - W3 Identifier Resolution Extensions", Work in Progress, March 1998. [33] Mogul, J. and A. van Hoff, "Duplicate Suppression in HTTP", Work in Progress, April 1998.
Authors' Addresses
Mark Nottingham EMail: mnot@pobox.com URI: http://www.mnot.net/ Jeffrey C. Mogul HP Labs 1501 Page Mill Road Palo Alto, CA 94304 US EMail: JeffMogul@acm.org
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