[1]Internet Assigned Numbers Authority

                      Hypertext Transfer Protocol (HTTP) Parameters

   Last Updated
          2023-02-21

   Available Formats
          [2][text-xml.png]
          XML [3][text-html.png]
          HTML [4][text-plain.png]
          Plain text

   Registries included below
     * [5]HTTP Content Coding Registry
     * [6]HTTP Transfer Coding Registry
     * [7]HTTP Forwarded Parameters
     * [8]HTTP Preferences
     * [9]HTTP Range Unit Registry

HTTP Content Coding Registry

   Registration Procedure(s)

IETF Review

   Reference
          [[10]RFC9110, Section 16.6.1]

   Available Formats
          [11][text-csv.png]
          CSV

   Name Description Reference Notes
   aes128gcm AES-GCM encryption with a 128-bit content encryption key [[12]RFC8188]
   br Brotli Compressed Data Format [[13]RFC7932]
   compress UNIX "compress" data format [Welch, T., "A Technique for High
   Performance Data Compression", IEEE Computer 17(6), June 1984.] [[14]RFC9110]
   Section 8.4.1.1
   deflate "deflate" compressed data ([[15]RFC1951]) inside the "zlib" data format
   ([[16]RFC1950]) [[17]RFC9110] Section 8.4.1.2
   exi W3C Efficient XML Interchange [[18]W3C Recommendation: Efficient XML
   Interchange (EXI) Format]
   gzip GZIP file format [[19]RFC1952] [[20]RFC9110] Section 8.4.1.3
   identity Reserved [[21]RFC9110] Section 12.5.3
   pack200-gzip Network Transfer Format for Java Archives [[22]JSR 200: Network
   Transfer Format for Java][[23]Kumar_Srinivasan][[24]John_Rose]
   x-compress Deprecated (alias for compress) [[25]RFC9110] Section 8.4.1.1
   x-gzip Deprecated (alias for gzip) [[26]RFC9110] Section 8.4.1.3
   zstd A stream of bytes compressed using the Zstandard protocol [[27]RFC8878]

HTTP Transfer Coding Registry

   Registration Procedure(s)

IETF Review

   Reference
          [[28]RFC9112, Section 7.3]

   Available Formats
          [29][text-csv.png]
          CSV

   Name Description Reference Notes
   chunked Transfer in a series of chunks [[30]RFC9112] Section 7.1
   compress UNIX "compress" data format [Welch, T., "A Technique for High
   Performance Data Compression", IEEE Computer 17(6), June 1984.] [[31]RFC9112]
   Section 7.2
   deflate "deflate" compressed data ([[32]RFC1951]) inside the "zlib" data format
   ([[33]RFC1950]) [[34]RFC9112] Section 7.2
   gzip GZIP file format [[35]RFC1952] [[36]RFC9112] Section 7.2
   identity (withdrawn in errata to [[37]RFC2616]) [[38]RFC2616] Section 3.6
   trailers (reserved) [[39]RFC9112] Section 12.3
   x-compress Deprecated (alias for compress) [[40]RFC9112] Section 7.2
   x-gzip Deprecated (alias for gzip) [[41]RFC9112] Section 7.2

HTTP Forwarded Parameters

   Registration Procedure(s)

IETF Review

   Reference
          [[42]RFC7239]

   Available Formats
          [43][text-csv.png]
          CSV

   Name Description Reference Notes
   by IP-address of incoming interface of a proxy [[44]RFC7239] Section 5.1
   for IP-address of client making a request through a proxy [[45]RFC7239] Section
   5.2
   host Host header field of the incoming request [[46]RFC7239] Section 5.3
   proto Application protocol used for incoming request [[47]RFC7239] Section 5.4

HTTP Preferences

   Registration Procedure(s)

Specification Required

   Expert(s)

Julian Reschke

   Reference
          [[48]RFC7240]

   Note

Registration requests should be sent to the mailing list described in
[[49]RFC7240]. If approved, designated experts should notify IANA within
two weeks. For assistance, please contact iana@iana.org.

   Available Formats
          [50][text-csv.png]
          CSV

   Preference Value Description Reference
   respond-async Indicates that the client prefers that the server respond
   asynchronously to a request. [[51]RFC7240], Section 4.1
   return One of either "minimal" or "representation" When the value is "minimal",
   it indicates that the client prefers that the server return a minimal response to
   a request. When the value is "representation", it indicates that the client
   prefers that the server include a representation of the current state of the
   resource in response to a request. [[52]RFC7240], Section 4.2
   wait Indicates an upper bound to the length of time the client expects it will
   take the server to process the request once it has been received. [[53]RFC7240],
   Section 4.3
   handling One of either "strict" or "lenient" When value is "strict", it indicates
   that the client wishes the server to apply strict validation and error handling
   to the processing of a request. When the value is "lenient", it indicates that
   the client wishes the server to apply lenient validation and error handling to
   the processing of the request. [[54]RFC7240], Section 4.4
   depth-noroot The "depth-noroot" preference indicates that the client wishes for
   the server to exclude the target (root) resource from processing by the HTTP
   method and only apply the HTTP method to the target resource's subordinate
   resources. This preference is only intended to be used with HTTP methods whose
   definitions explicitly provide support for the Depth [[55]RFC4918] header field.
   Furthermore, this preference only applies when the Depth header field has a value
   of "1" or "infinity" (either implicitly or explicitly). [[56]RFC8144], Section 4
   safe Indicates that safe (i.e., unobjectionable) content is preferred.
   [[57]RFC8674]
   odata.allow-entityreferences Indicates that the service is allowed to return
   references in place of resources that have previously been returned, with at
   least the properties requested, in the same response. [[58]OData Version 4.01
   Part 1: Protocol]
   odata.callback Requests that the service invoke the specified URL to signal some
   service state, such as the completion of an asynchronous result or availability
   of new or modified information. The service state that triggers the change is
   dependent upon the request. [[59]OData Version 4.01 Part 1: Protocol]
   odata.continue-on-error Requests that the service attempt to continue processing
   a request that encounters non-fatal errors, for example in a multi-part request.
   The response SHOULD indicate what portions of the request were and were not able
   to be successfully handled. [[60]OData Version 4.01 Part 1: Protocol]
   odata.include-annotations Comma-separated list of terms to include or, when
   prefixed with a minus sign (-), exclude from the response. Terms MUST be
   namespace-qualified and MAY specify just a namespace to include or exclude all
   terms within that namespace. The special value "*" matches all annotations.
   Specifies the set of annotations the client requests to be included, where
   applicable, or excluded in the response. [[61]OData Version 4.01 Part 1:
   Protocol]
   odata.maxpagesize A positive integer that represents the maximum number of items
   each collection in a response SHOULD contain. Requests that each collection
   within the response contain no more than the number of items specified as the
   positive integer value of this preference. [[62]OData Version 4.01 Part 1:
   Protocol]
   omit-values One of nulls - properties containing null values may be omitted from
   the response defaults - properties containing the property default value may be
   omitted from the response. Specifies whether a server can omit properties with a
   null value or properties set to their default value from a response. [[63]OData
   Version 4.01 Part 1: Protocol]
   odata.track-changes Requests that the service initiate change tracking on the
   result of this request, according to the underlying protocol. [[64]OData Version
   4.01 Part 1: Protocol]

HTTP Range Unit Registry

   Registration Procedure(s)

IETF Review

   Reference
          [[65]RFC9110, Section 16.5.1]

   Available Formats
          [66][text-csv.png]
          CSV

   Name Description Reference Notes
   bytes a range of octets [[67]RFC9110] Section 14.1.2
   none reserved as keyword to indicate range requests are not supported
   [[68]RFC9110] Section 14.3

                                   Contact Information

           ID               Name                   Contact URI             Last Updated
   [Kumar_Srinivasan] Kumar Srinivasan [69]mailto:Kumar.Srinivasan&Sun.COM
   2006-10-27
   [John_Rose]        John Rose        [70]mailto:John.Rose&Sun.COM        2006-10-27

   [71]Licensing Terms

References

   1. http://www.iana.org/
   2. http://www.iana.org/assignments/http-parameters/http-parameters.xml
   3. http://www.iana.org/assignments/http-parameters/http-parameters.xhtml
   4. http://www.iana.org/assignments/http-parameters/http-parameters.txt
   5. http://www.iana.org/assignments/http-parameters/http-parameters.xhtml#content-coding
   6. http://www.iana.org/assignments/http-parameters/http-parameters.xhtml#transfer-coding
   7. http://www.iana.org/assignments/http-parameters/http-parameters.xhtml#forwarded
   8. http://www.iana.org/assignments/http-parameters/http-parameters.xhtml#preferences
   9. http://www.iana.org/assignments/http-parameters/http-parameters.xhtml#range-units
  10. https://www.iana.org/go/rfc9110
  11. http://www.iana.org/assignments/http-parameters/content-coding.csv
  12. https://www.iana.org/go/rfc8188
  13. https://www.iana.org/go/rfc7932
  14. https://www.iana.org/go/rfc9110
  15. https://www.iana.org/go/rfc1951
  16. https://www.iana.org/go/rfc1950
  17. https://www.iana.org/go/rfc9110
  18. http://www.w3.org/TR/exi/
  19. https://www.iana.org/go/rfc1952
  20. https://www.iana.org/go/rfc9110
  21. https://www.iana.org/go/rfc9110
  22. http://www.jcp.org/en/jsr/detail?id=200
  23. http://www.iana.org/assignments/http-parameters/http-parameters.xhtml#Kumar_Srinivasan
  24. http://www.iana.org/assignments/http-parameters/http-parameters.xhtml#John_Rose
  25. https://www.iana.org/go/rfc9110
  26. https://www.iana.org/go/rfc9110
  27. https://www.iana.org/go/rfc8878
  28. https://www.iana.org/go/rfc9112
  29. http://www.iana.org/assignments/http-parameters/transfer-coding.csv
  30. https://www.iana.org/go/rfc9112
  31. https://www.iana.org/go/rfc9112
  32. https://www.iana.org/go/rfc1951
  33. https://www.iana.org/go/rfc1950
  34. https://www.iana.org/go/rfc9112
  35. https://www.iana.org/go/rfc1952
  36. https://www.iana.org/go/rfc9112
  37. https://www.iana.org/go/rfc2616
  38. https://www.iana.org/go/rfc2616
  39. https://www.iana.org/go/rfc9112
  40. https://www.iana.org/go/rfc9112
  41. https://www.iana.org/go/rfc9112
  42. https://www.iana.org/go/rfc7239
  43. http://www.iana.org/assignments/http-parameters/forwarded.csv
  44. https://www.iana.org/go/rfc7239
  45. https://www.iana.org/go/rfc7239
  46. https://www.iana.org/go/rfc7239
  47. https://www.iana.org/go/rfc7239
  48. https://www.iana.org/go/rfc7240
  49. https://www.iana.org/go/rfc7240
  50. http://www.iana.org/assignments/http-parameters/preferences.csv
  51. https://www.iana.org/go/rfc7240
  52. https://www.iana.org/go/rfc7240
  53. https://www.iana.org/go/rfc7240
  54. https://www.iana.org/go/rfc7240
  55. https://www.iana.org/go/rfc4918
  56. https://www.iana.org/go/rfc8144
  57. https://www.iana.org/go/rfc8674
  58. http://docs.oasis-open.org/odata/odata/v4.01/odata-v4.01-part1-protocol.html#sec_Preferenceallowentityreferencesodata
  59. http://docs.oasis-open.org/odata/odata/v4.01/odata-v4.01-part1-protocol.html#sec_Preferencecallbackodatacallback
  60. http://docs.oasis-open.org/odata/odata/v4.01/odata-v4.01-part1-protocol.html#sec_Preferencecontinueonerrorodatacontin
  61. http://docs.oasis-open.org/odata/odata/v4.01/odata-v4.01-part1-protocol.html#sec_Preferenceincludeannotationsodatainc
  62. http://docs.oasis-open.org/odata/odata/v4.01/odata-v4.01-part1-protocol.html#sec_Preferencemaxpagesizeodatamaxpagesiz
  63. http://docs.oasis-open.org/odata/odata/v4.01/odata-v4.01-part1-protocol.html#sec_Preferenceomitvalues
  64. http://docs.oasis-open.org/odata/odata/v4.01/odata-v4.01-part1-protocol.html#sec_Preferencetrackchangesodatatrackchan
  65. https://www.iana.org/go/rfc9110
  66. http://www.iana.org/assignments/http-parameters/range-units.csv
  67. https://www.iana.org/go/rfc9110
  68. https://www.iana.org/go/rfc9110
  69. mailto:Kumar.Srinivasan&Sun.COM
  70. mailto:John.Rose&Sun.COM
  71. https://www.iana.org/help/licensing-terms