draft-ietf-httpbis-p4-conditional-04.txt   draft-ietf-httpbis-p4-conditional-05.txt 
Network Working Group R. Fielding, Ed. Network Working Group R. Fielding, Ed.
Internet-Draft Day Software Internet-Draft Day Software
Obsoletes: 2616 (if approved) J. Gettys Obsoletes: 2616 (if approved) J. Gettys
Intended status: Standards Track One Laptop per Child Intended status: Standards Track One Laptop per Child
Expires: March 2, 2009 J. Mogul Expires: May 20, 2009 J. Mogul
HP HP
H. Frystyk H. Frystyk
Microsoft Microsoft
L. Masinter L. Masinter
Adobe Systems Adobe Systems
P. Leach P. Leach
Microsoft Microsoft
T. Berners-Lee T. Berners-Lee
W3C/MIT W3C/MIT
Y. Lafon, Ed. Y. Lafon, Ed.
W3C W3C
J. Reschke, Ed. J. Reschke, Ed.
greenbytes greenbytes
August 29, 2008 November 16, 2008
HTTP/1.1, part 4: Conditional Requests HTTP/1.1, part 4: Conditional Requests
draft-ietf-httpbis-p4-conditional-04 draft-ietf-httpbis-p4-conditional-05
Status of this Memo Status of this Memo
By submitting this Internet-Draft, each author represents that any By submitting this Internet-Draft, each author represents that any
applicable patent or other IPR claims of which he or she is aware applicable patent or other IPR claims of which he or she is aware
have been or will be disclosed, and any of which he or she becomes have been or will be disclosed, and any of which he or she becomes
aware will be disclosed, in accordance with Section 6 of BCP 79. aware will be disclosed, in accordance with Section 6 of BCP 79.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that Task Force (IETF), its areas, and its working groups. Note that
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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."
The list of current Internet-Drafts can be accessed at The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt. http://www.ietf.org/ietf/1id-abstracts.txt.
The list of Internet-Draft Shadow Directories can be accessed at The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html. http://www.ietf.org/shadow.html.
This Internet-Draft will expire on March 2, 2009. This Internet-Draft will expire on May 20, 2009.
Abstract Abstract
The Hypertext Transfer Protocol (HTTP) is an application-level The Hypertext Transfer Protocol (HTTP) is an application-level
protocol for distributed, collaborative, hypermedia information protocol for distributed, collaborative, hypermedia information
systems. HTTP has been in use by the World Wide Web global systems. HTTP has been in use by the World Wide Web global
information initiative since 1990. This document is Part 4 of the information initiative since 1990. This document is Part 4 of the
seven-part specification that defines the protocol referred to as seven-part specification that defines the protocol referred to as
"HTTP/1.1" and, taken together, obsoletes RFC 2616. Part 4 defines "HTTP/1.1" and, taken together, obsoletes RFC 2616. Part 4 defines
request header fields for indicating conditional requests and the request header fields for indicating conditional requests and the
rules for constructing responses to those requests. rules for constructing responses to those requests.
Editorial Note (To be removed by RFC Editor) Editorial Note (To be removed by RFC Editor)
Discussion of this draft should take place on the HTTPBIS working Discussion of this draft should take place on the HTTPBIS working
group mailing list (ietf-http-wg@w3.org). The current issues list is group mailing list (ietf-http-wg@w3.org). The current issues list is
at <http://www.tools.ietf.org/wg/httpbis/trac/report/11> and related at <http://tools.ietf.org/wg/httpbis/trac/report/11> and related
documents (including fancy diffs) can be found at documents (including fancy diffs) can be found at
<http://www.tools.ietf.org/wg/httpbis/>. <http://tools.ietf.org/wg/httpbis/>.
The changes in this draft are summarized in Appendix B.4. The changes in this draft are summarized in Appendix B.6.
Table of Contents Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1. Requirements . . . . . . . . . . . . . . . . . . . . . . . 4 1.1. Requirements . . . . . . . . . . . . . . . . . . . . . . . 4
2. Notational Conventions and Generic Grammar . . . . . . . . . . 4 2. Notational Conventions and Generic Grammar . . . . . . . . . . 4
3. Entity Tags . . . . . . . . . . . . . . . . . . . . . . . . . 5 3. Entity Tags . . . . . . . . . . . . . . . . . . . . . . . . . 5
4. Status Code Definitions . . . . . . . . . . . . . . . . . . . 5 4. Status Code Definitions . . . . . . . . . . . . . . . . . . . 5
4.1. 304 Not Modified . . . . . . . . . . . . . . . . . . . . . 5 4.1. 304 Not Modified . . . . . . . . . . . . . . . . . . . . . 5
4.2. 412 Precondition Failed . . . . . . . . . . . . . . . . . 6 4.2. 412 Precondition Failed . . . . . . . . . . . . . . . . . 6
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6. Rules for When to Use Entity Tags and Last-Modified Dates . . 9 6. Rules for When to Use Entity Tags and Last-Modified Dates . . 9
7. Header Field Definitions . . . . . . . . . . . . . . . . . . . 11 7. Header Field Definitions . . . . . . . . . . . . . . . . . . . 11
7.1. ETag . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7.1. ETag . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
7.2. If-Match . . . . . . . . . . . . . . . . . . . . . . . . . 12 7.2. If-Match . . . . . . . . . . . . . . . . . . . . . . . . . 12
7.3. If-Modified-Since . . . . . . . . . . . . . . . . . . . . 13 7.3. If-Modified-Since . . . . . . . . . . . . . . . . . . . . 13
7.4. If-None-Match . . . . . . . . . . . . . . . . . . . . . . 14 7.4. If-None-Match . . . . . . . . . . . . . . . . . . . . . . 14
7.5. If-Unmodified-Since . . . . . . . . . . . . . . . . . . . 16 7.5. If-Unmodified-Since . . . . . . . . . . . . . . . . . . . 16
7.6. Last-Modified . . . . . . . . . . . . . . . . . . . . . . 16 7.6. Last-Modified . . . . . . . . . . . . . . . . . . . . . . 16
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 17 8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 17
8.1. Message Header Registration . . . . . . . . . . . . . . . 17 8.1. Message Header Registration . . . . . . . . . . . . . . . 17
9. Security Considerations . . . . . . . . . . . . . . . . . . . 17 9. Security Considerations . . . . . . . . . . . . . . . . . . . 18
10. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 18 10. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 18
11. References . . . . . . . . . . . . . . . . . . . . . . . . . . 18 11. References . . . . . . . . . . . . . . . . . . . . . . . . . . 18
11.1. Normative References . . . . . . . . . . . . . . . . . . . 18 11.1. Normative References . . . . . . . . . . . . . . . . . . . 18
11.2. Informative References . . . . . . . . . . . . . . . . . . 18 11.2. Informative References . . . . . . . . . . . . . . . . . . 18
Appendix A. Compatibility with Previous Versions . . . . . . . . 18 Appendix A. Compatibility with Previous Versions . . . . . . . . 18
A.1. Changes from RFC 2616 . . . . . . . . . . . . . . . . . . 18 A.1. Changes from RFC 2616 . . . . . . . . . . . . . . . . . . 19
Appendix B. Change Log (to be removed by RFC Editor before Appendix B. Change Log (to be removed by RFC Editor before
publication) . . . . . . . . . . . . . . . . . . . . 19 publication) . . . . . . . . . . . . . . . . . . . . 19
B.1. Since RFC2616 . . . . . . . . . . . . . . . . . . . . . . 19 B.1. Since RFC2616 . . . . . . . . . . . . . . . . . . . . . . 19
B.2. Since draft-ietf-httpbis-p4-conditional-00 . . . . . . . . 19 B.2. Since draft-ietf-httpbis-p4-conditional-00 . . . . . . . . 19
B.3. Since draft-ietf-httpbis-p4-conditional-01 . . . . . . . . 19 B.3. Since draft-ietf-httpbis-p4-conditional-01 . . . . . . . . 19
B.4. Since draft-ietf-httpbis-p4-conditional-02 . . . . . . . . 19 B.4. Since draft-ietf-httpbis-p4-conditional-02 . . . . . . . . 19
B.5. Since draft-ietf-httpbis-p4-conditional-03 . . . . . . . . 19 B.5. Since draft-ietf-httpbis-p4-conditional-03 . . . . . . . . 20
B.6. Since draft-ietf-httpbis-p4-conditional-04 . . . . . . . . 20
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 21 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 21
Intellectual Property and Copyright Statements . . . . . . . . . . 24 Intellectual Property and Copyright Statements . . . . . . . . . . 24
1. Introduction 1. Introduction
This document defines HTTP/1.1 response metadata for indicating This document defines HTTP/1.1 response metadata for indicating
potential changes to payload content, including modification time potential changes to payload content, including modification time
stamps and opaque entity-tags, and the HTTP conditional request stamps and opaque entity-tags, and the HTTP conditional request
mechanisms that allow preconditions to be placed on a request method. mechanisms that allow preconditions to be placed on a request method.
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REQUIRED level and all the SHOULD level requirements for its REQUIRED level and all the SHOULD level requirements for its
protocols is said to be "unconditionally compliant"; one that protocols is said to be "unconditionally compliant"; one that
satisfies all the MUST level requirements but not all the SHOULD satisfies all the MUST level requirements but not all the SHOULD
level requirements for its protocols is said to be "conditionally level requirements for its protocols is said to be "conditionally
compliant." compliant."
2. Notational Conventions and Generic Grammar 2. Notational Conventions and Generic Grammar
This specification uses the ABNF syntax defined in Section 2.1 of This specification uses the ABNF syntax defined in Section 2.1 of
[Part1] and the core rules defined in Section 2.2 of [Part1]: [Part1] and the core rules defined in Section 2.2 of [Part1]:
[[abnf.dep: ABNF syntax and basic rules will be adopted from RFC
5234, see <http://tools.ietf.org/wg/httpbis/trac/ticket/36>.]]
quoted-string = <quoted-string, defined in [Part1], Section 2.2> quoted-string = <quoted-string, defined in [Part1], Section 2.2>
OWS = <OWS, defined in [Part1], Section 2.2>
The ABNF rules below are defined in other parts: The ABNF rules below are defined in other parts:
HTTP-date = <HTTP-date, defined in [Part1], Section 3.3.1> HTTP-date = <HTTP-date, defined in [Part1], Section 3.3.1>
3. Entity Tags 3. Entity Tags
Entity tags are used for comparing two or more entities from the same Entity tags are used for comparing two or more entities from the same
requested resource. HTTP/1.1 uses entity tags in the ETag requested resource. HTTP/1.1 uses entity tags in the ETag
(Section 7.1), If-Match (Section 7.2), If-None-Match (Section 7.4), (Section 7.1), If-Match (Section 7.2), If-None-Match (Section 7.4),
and If-Range (Section 6.3 of [Part5]) header fields. The definition and If-Range (Section 6.3 of [Part5]) header fields. The definition
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This section defines the syntax and semantics of HTTP/1.1 header This section defines the syntax and semantics of HTTP/1.1 header
fields related to conditional requests. fields related to conditional requests.
For entity-header fields, both sender and recipient refer to either For entity-header fields, both sender and recipient refer to either
the client or the server, depending on who sends and who receives the the client or the server, depending on who sends and who receives the
entity. entity.
7.1. ETag 7.1. ETag
The ETag response-header field provides the current value of the The response-header field "ETag" provides the current value of the
entity tag for the requested variant. The headers used with entity entity tag (see Section 3) for the requested variant. The headers
tags are described in Sections 7.2 and 7.4 of this document, and in used with entity tags are described in Sections 7.2 and 7.4 of this
Section 6.3 of [Part5]. The entity tag MAY be used for comparison document, and in Section 6.3 of [Part5]. The entity tag MAY be used
with other entities from the same resource (see Section 5). for comparison with other entities from the same resource (see
Section 5).
ETag = "ETag" ":" entity-tag ETag = "ETag" ":" OWS ETag-v
ETag-v = entity-tag
Examples: Examples:
ETag: "xyzzy" ETag: "xyzzy"
ETag: W/"xyzzy" ETag: W/"xyzzy"
ETag: "" ETag: ""
The ETag response-header field value, an entity tag, provides for an The ETag response-header field value, an entity tag, provides for an
"opaque" cache validator. This might allow more reliable validation "opaque" cache validator. This might allow more reliable validation
in situations where it is inconvenient to store modification dates, in situations where it is inconvenient to store modification dates,
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The principle behind entity tags is that only the service author The principle behind entity tags is that only the service author
knows the semantics of a resource well enough to select an knows the semantics of a resource well enough to select an
appropriate cache validation mechanism, and the specification of any appropriate cache validation mechanism, and the specification of any
validator comparison function more complex than byte-equality would validator comparison function more complex than byte-equality would
open up a can of worms. Thus, comparisons of any other headers open up a can of worms. Thus, comparisons of any other headers
(except Last-Modified, for compatibility with HTTP/1.0) are never (except Last-Modified, for compatibility with HTTP/1.0) are never
used for purposes of validating a cache entry. used for purposes of validating a cache entry.
7.2. If-Match 7.2. If-Match
The If-Match request-header field is used with a method to make it The request-header field "If-Match" is used with a method to make it
conditional. A client that has one or more entities previously conditional. A client that has one or more entities previously
obtained from the resource can verify that one of those entities is obtained from the resource can verify that one of those entities is
current by including a list of their associated entity tags in the current by including a list of their associated entity tags in the
If-Match header field. Entity tags are defined in Section 3. The If-Match header field. Entity tags are defined in Section 3. The
purpose of this feature is to allow efficient updates of cached purpose of this feature is to allow efficient updates of cached
information with a minimum amount of transaction overhead. It is information with a minimum amount of transaction overhead. It is
also used, on updating requests, to prevent inadvertent modification also used, on updating requests, to prevent inadvertent modification
of the wrong version of a resource. As a special case, the value "*" of the wrong version of a resource. As a special case, the value "*"
matches any current entity of the resource. matches any current entity of the resource.
If-Match = "If-Match" ":" ( "*" | 1#entity-tag ) If-Match = "If-Match" ":" OWS If-Match-v
If-Match-v = "*" / 1#entity-tag
If any of the entity tags match the entity tag of the entity that If any of the entity tags match the entity tag of the entity that
would have been returned in the response to a similar GET request would have been returned in the response to a similar GET request
(without the If-Match header) on that resource, or if "*" is given (without the If-Match header) on that resource, or if "*" is given
and any current entity exists for that resource, then the server MAY and any current entity exists for that resource, then the server MAY
perform the requested method as if the If-Match header field did not perform the requested method as if the If-Match header field did not
exist. exist.
A server MUST use the strong comparison function (see Section 5) to A server MUST use the strong comparison function (see Section 5) to
compare the entity tags in If-Match. compare the entity tags in If-Match.
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If-Match: "xyzzy" If-Match: "xyzzy"
If-Match: "xyzzy", "r2d2xxxx", "c3piozzzz" If-Match: "xyzzy", "r2d2xxxx", "c3piozzzz"
If-Match: * If-Match: *
The result of a request having both an If-Match header field and The result of a request having both an If-Match header field and
either an If-None-Match or an If-Modified-Since header fields is either an If-None-Match or an If-Modified-Since header fields is
undefined by this specification. undefined by this specification.
7.3. If-Modified-Since 7.3. If-Modified-Since
The If-Modified-Since request-header field is used with a method to The request-header field "If-Modified-Since" is used with a method to
make it conditional: if the requested variant has not been modified make it conditional: if the requested variant has not been modified
since the time specified in this field, an entity will not be since the time specified in this field, an entity will not be
returned from the server; instead, a 304 (Not Modified) response will returned from the server; instead, a 304 (Not Modified) response will
be returned without any message-body. be returned without any message-body.
If-Modified-Since = "If-Modified-Since" ":" HTTP-date If-Modified-Since = "If-Modified-Since" ":" OWS
If-Modified-Since-v
If-Modified-Since-v = HTTP-date
An example of the field is: An example of the field is:
If-Modified-Since: Sat, 29 Oct 1994 19:43:31 GMT If-Modified-Since: Sat, 29 Oct 1994 19:43:31 GMT
A GET method with an If-Modified-Since header and no Range header A GET method with an If-Modified-Since header and no Range header
requests that the identified entity be transferred only if it has requests that the identified entity be transferred only if it has
been modified since the date given by the If-Modified-Since header. been modified since the date given by the If-Modified-Since header.
The algorithm for determining this includes the following cases: The algorithm for determining this includes the following cases:
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to the server's clock. Corrections for different time bases to the server's clock. Corrections for different time bases
between client and server are at best approximate due to network between client and server are at best approximate due to network
latency. latency.
The result of a request having both an If-Modified-Since header field The result of a request having both an If-Modified-Since header field
and either an If-Match or an If-Unmodified-Since header fields is and either an If-Match or an If-Unmodified-Since header fields is
undefined by this specification. undefined by this specification.
7.4. If-None-Match 7.4. If-None-Match
The If-None-Match request-header field is used with a method to make The request-header field "If-None-Match" is used with a method to
it conditional. A client that has one or more entities previously make it conditional. A client that has one or more entities
obtained from the resource can verify that none of those entities is previously obtained from the resource can verify that none of those
current by including a list of their associated entity tags in the entities is current by including a list of their associated entity
If-None-Match header field. The purpose of this feature is to allow tags in the If-None-Match header field. The purpose of this feature
efficient updates of cached information with a minimum amount of is to allow efficient updates of cached information with a minimum
transaction overhead. It is also used to prevent a method (e.g. amount of transaction overhead. It is also used to prevent a method
PUT) from inadvertently modifying an existing resource when the (e.g. PUT) from inadvertently modifying an existing resource when
client believes that the resource does not exist. the client believes that the resource does not exist.
As a special case, the value "*" matches any current entity of the As a special case, the value "*" matches any current entity of the
resource. resource.
If-None-Match = "If-None-Match" ":" ( "*" | 1#entity-tag ) If-None-Match = "If-None-Match" ":" OWS If-None-Match-v
If-None-Match-v = "*" / 1#entity-tag
If any of the entity tags match the entity tag of the entity that If any of the entity tags match the entity tag of the entity that
would have been returned in the response to a similar GET request would have been returned in the response to a similar GET request
(without the If-None-Match header) on that resource, or if "*" is (without the If-None-Match header) on that resource, or if "*" is
given and any current entity exists for that resource, then the given and any current entity exists for that resource, then the
server MUST NOT perform the requested method, unless required to do server MUST NOT perform the requested method, unless required to do
so because the resource's modification date fails to match that so because the resource's modification date fails to match that
supplied in an If-Modified-Since header field in the request. supplied in an If-Modified-Since header field in the request.
Instead, if the request method was GET or HEAD, the server SHOULD Instead, if the request method was GET or HEAD, the server SHOULD
respond with a 304 (Not Modified) response, including the cache- respond with a 304 (Not Modified) response, including the cache-
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not exist. This feature is intended to be useful in preventing races not exist. This feature is intended to be useful in preventing races
between PUT operations. between PUT operations.
Examples: Examples:
If-None-Match: "xyzzy" If-None-Match: "xyzzy"
If-None-Match: W/"xyzzy" If-None-Match: W/"xyzzy"
If-None-Match: "xyzzy", "r2d2xxxx", "c3piozzzz" If-None-Match: "xyzzy", "r2d2xxxx", "c3piozzzz"
If-None-Match: W/"xyzzy", W/"r2d2xxxx", W/"c3piozzzz" If-None-Match: W/"xyzzy", W/"r2d2xxxx", W/"c3piozzzz"
If-None-Match: * If-None-Match: *
The result of a request having both an If-None-Match header field and The result of a request having both an If-None-Match header field and
either an If-Match or an If-Unmodified-Since header fields is either an If-Match or an If-Unmodified-Since header fields is
undefined by this specification. undefined by this specification.
7.5. If-Unmodified-Since 7.5. If-Unmodified-Since
The If-Unmodified-Since request-header field is used with a method to The request-header field "If-Unmodified-Since" is used with a method
make it conditional. If the requested resource has not been modified to make it conditional. If the requested resource has not been
since the time specified in this field, the server SHOULD perform the modified since the time specified in this field, the server SHOULD
requested operation as if the If-Unmodified-Since header were not perform the requested operation as if the If-Unmodified-Since header
present. were not present.
If the requested variant has been modified since the specified time, If the requested variant has been modified since the specified time,
the server MUST NOT perform the requested operation, and MUST return the server MUST NOT perform the requested operation, and MUST return
a 412 (Precondition Failed). a 412 (Precondition Failed).
If-Unmodified-Since = "If-Unmodified-Since" ":" HTTP-date If-Unmodified-Since = "If-Unmodified-Since" ":" OWS
If-Unmodified-Since-v
If-Unmodified-Since-v = HTTP-date
An example of the field is: An example of the field is:
If-Unmodified-Since: Sat, 29 Oct 1994 19:43:31 GMT If-Unmodified-Since: Sat, 29 Oct 1994 19:43:31 GMT
If the request normally (i.e., without the If-Unmodified-Since If the request normally (i.e., without the If-Unmodified-Since
header) would result in anything other than a 2xx or 412 status, the header) would result in anything other than a 2xx or 412 status, the
If-Unmodified-Since header SHOULD be ignored. If-Unmodified-Since header SHOULD be ignored.
If the specified date is invalid, the header is ignored. If the specified date is invalid, the header is ignored.
The result of a request having both an If-Unmodified-Since header The result of a request having both an If-Unmodified-Since header
field and either an If-None-Match or an If-Modified-Since header field and either an If-None-Match or an If-Modified-Since header
fields is undefined by this specification. fields is undefined by this specification.
7.6. Last-Modified 7.6. Last-Modified
The Last-Modified entity-header field indicates the date and time at The entity-header field "Last-Modified" indicates the date and time
which the origin server believes the variant was last modified. at which the origin server believes the variant was last modified.
Last-Modified = "Last-Modified" ":" HTTP-date Last-Modified = "Last-Modified" ":" OWS Last-Modified-v
Last-Modified-v = HTTP-date
An example of its use is An example of its use is
Last-Modified: Tue, 15 Nov 1994 12:45:26 GMT Last-Modified: Tue, 15 Nov 1994 12:45:26 GMT
The exact meaning of this header field depends on the implementation The exact meaning of this header field depends on the implementation
of the origin server and the nature of the original resource. For of the origin server and the nature of the original resource. For
files, it may be just the file system last-modified time. For files, it may be just the file system last-modified time. For
entities with dynamically included parts, it may be the most recent entities with dynamically included parts, it may be the most recent
of the set of last-modify times for its component parts. For of the set of last-modify times for its component parts. For
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10. Acknowledgments 10. Acknowledgments
11. References 11. References
11.1. Normative References 11.1. Normative References
[Part1] Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H., [Part1] Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,
Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed., Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,
and J. Reschke, Ed., "HTTP/1.1, part 1: URIs, Connections, and J. Reschke, Ed., "HTTP/1.1, part 1: URIs, Connections,
and Message Parsing", draft-ietf-httpbis-p1-messaging-04 and Message Parsing", draft-ietf-httpbis-p1-messaging-05
(work in progress), August 2008. (work in progress), November 2008.
[Part5] Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H., [Part5] Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,
Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed., Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,
and J. Reschke, Ed., "HTTP/1.1, part 5: Range Requests and and J. Reschke, Ed., "HTTP/1.1, part 5: Range Requests and
Partial Responses", draft-ietf-httpbis-p5-range-04 (work Partial Responses", draft-ietf-httpbis-p5-range-05 (work
in progress), August 2008. in progress), November 2008.
[Part6] Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H., [Part6] Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,
Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed., Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,
and J. Reschke, Ed., "HTTP/1.1, part 6: Caching", and J. Reschke, Ed., "HTTP/1.1, part 6: Caching",
draft-ietf-httpbis-p6-cache-04 (work in progress), draft-ietf-httpbis-p6-cache-05 (work in progress),
August 2008. November 2008.
[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, March 1997. Requirement Levels", BCP 14, RFC 2119, March 1997.
11.2. Informative References 11.2. Informative References
[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, June 1999. Transfer Protocol -- HTTP/1.1", RFC 2616, June 1999.
skipping to change at page 19, line 15 skipping to change at page 19, line 20
Appendix B. Change Log (to be removed by RFC Editor before publication) Appendix B. Change Log (to be removed by RFC Editor before publication)
B.1. Since RFC2616 B.1. Since RFC2616
Extracted relevant partitions from [RFC2616]. Extracted relevant partitions from [RFC2616].
B.2. Since draft-ietf-httpbis-p4-conditional-00 B.2. Since draft-ietf-httpbis-p4-conditional-00
Closed issues: Closed issues:
o <http://www3.tools.ietf.org/wg/httpbis/trac/ticket/35>: "Normative o <http://tools.ietf.org/wg/httpbis/trac/ticket/35>: "Normative and
and Informative references" Informative references"
Other changes: Other changes:
o Move definitions of 304 and 412 condition codes from Part2. o Move definitions of 304 and 412 condition codes from Part2.
B.3. Since draft-ietf-httpbis-p4-conditional-01 B.3. Since draft-ietf-httpbis-p4-conditional-01
Ongoing work on ABNF conversion Ongoing work on ABNF conversion
(<http://www3.tools.ietf.org/wg/httpbis/trac/ticket/36>): (<http://tools.ietf.org/wg/httpbis/trac/ticket/36>):
o Add explicit references to BNF syntax and rules imported from o Add explicit references to BNF syntax and rules imported from
other parts of the specification. other parts of the specification.
B.4. Since draft-ietf-httpbis-p4-conditional-02 B.4. Since draft-ietf-httpbis-p4-conditional-02
Closed issues: Closed issues:
o <http://www3.tools.ietf.org/wg/httpbis/trac/ticket/116>: "Weak o <http://tools.ietf.org/wg/httpbis/trac/ticket/116>: "Weak ETags on
ETags on non-GET requests" non-GET requests"
Ongoing work on IANA Message Header Registration Ongoing work on IANA Message Header Registration
(<http://www3.tools.ietf.org/wg/httpbis/trac/ticket/40>): (<http://tools.ietf.org/wg/httpbis/trac/ticket/40>):
o Reference RFC 3984, and update header registrations for headers o Reference RFC 3984, and update header registrations for headers
defined in this document. defined in this document.
B.5. Since draft-ietf-httpbis-p4-conditional-03 B.5. Since draft-ietf-httpbis-p4-conditional-03
Closed issues: Closed issues:
o <http://www3.tools.ietf.org/wg/httpbis/trac/ticket/71>: "Examples o <http://tools.ietf.org/wg/httpbis/trac/ticket/71>: "Examples for
for ETag matching" ETag matching"
o <http://www3.tools.ietf.org/wg/httpbis/trac/ticket/124>: "'entity o <http://tools.ietf.org/wg/httpbis/trac/ticket/124>: "'entity
value' undefined" value' undefined"
o <http://www3.tools.ietf.org/wg/httpbis/trac/ticket/126>: "bogus
2068 Date header reference" o <http://tools.ietf.org/wg/httpbis/trac/ticket/126>: "bogus 2068
Date header reference"
B.6. Since draft-ietf-httpbis-p4-conditional-04
Ongoing work on ABNF conversion
(<http://tools.ietf.org/wg/httpbis/trac/ticket/36>):
o Use "/" instead of "|" for alternatives.
o Introduce new ABNF rules for "bad" whitespace ("BWS"), optional
whitespace ("OWS") and required whitespace ("RWS").
o Rewrite ABNFs to spell out whitespace rules, factor out header
value format definitions.
Index Index
3 3
304 Not Modified (status code) 5 304 Not Modified (status code) 5
4 4
412 Precondition Failed (status code) 6 412 Precondition Failed (status code) 6
E E
ETag header 11 ETag header 11
G G
Grammar Grammar
entity-tag 5 entity-tag 5
ETag 11 ETag 11
ETag-v 11
If-Match 12 If-Match 12
If-Match-v 12
If-Modified-Since 13 If-Modified-Since 13
If-Modified-Since-v 13
If-None-Match 15 If-None-Match 15
If-None-Match-v 15
If-Unmodified-Since 16 If-Unmodified-Since 16
If-Unmodified-Since-v 16
Last-Modified 16 Last-Modified 16
Last-Modified-v 16
opaque-tag 5 opaque-tag 5
weak 5 weak 5
H H
Headers Headers
ETag 11 ETag 11
If-Match 12 If-Match 12
If-Modified-Since 13 If-Modified-Since 13
If-None-Match 14 If-None-Match 14
If-Unmodified-Since 16 If-Unmodified-Since 16
 End of changes. 41 change blocks. 
59 lines changed or deleted 88 lines changed or added

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