draft-ietf-httpbis-p7-auth-04.txt		draft-ietf-httpbis-p7-auth-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
	Updates: 2617 (if approved) One Laptop per Child		Updates: 2617 (if approved) One Laptop per Child
	Intended status: Standards Track J. Mogul		Intended status: Standards Track J. Mogul
	Expires: March 2, 2009 HP		Expires: May 20, 2009 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 7: Authentication		HTTP/1.1, part 7: Authentication
	draft-ietf-httpbis-p7-auth-04		draft-ietf-httpbis-p7-auth-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
	skipping to change at page 1, line 49		skipping to change at page 1, line 49
	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 7 of the		information initiative since 1990. This document is Part 7 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 7 defines		"HTTP/1.1" and, taken together, obsoletes RFC 2616. Part 7 defines
	HTTP Authentication.		HTTP Authentication.
	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. Status Code Definitions . . . . . . . . . . . . . . . . . . . 5		3. Status Code Definitions . . . . . . . . . . . . . . . . . . . 5
	3.1. 401 Unauthorized . . . . . . . . . . . . . . . . . . . . . 5		3.1. 401 Unauthorized . . . . . . . . . . . . . . . . . . . . . 5
	3.2. 407 Proxy Authentication Required . . . . . . . . . . . . 5		3.2. 407 Proxy Authentication Required . . . . . . . . . . . . 5
	4. Header Field Definitions . . . . . . . . . . . . . . . . . . . 5		4. Header Field Definitions . . . . . . . . . . . . . . . . . . . 5
	4.1. Authorization . . . . . . . . . . . . . . . . . . . . . . 5		4.1. Authorization . . . . . . . . . . . . . . . . . . . . . . 5
	4.2. Proxy-Authenticate . . . . . . . . . . . . . . . . . . . . 6		4.2. Proxy-Authenticate . . . . . . . . . . . . . . . . . . . . 6
	4.3. Proxy-Authorization . . . . . . . . . . . . . . . . . . . 7		4.3. Proxy-Authorization . . . . . . . . . . . . . . . . . . . 7
	4.4. WWW-Authenticate . . . . . . . . . . . . . . . . . . . . . 7		4.4. WWW-Authenticate . . . . . . . . . . . . . . . . . . . . . 7
	5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7		5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7
	5.1. Message Header Registration . . . . . . . . . . . . . . . 7		5.1. Message Header Registration . . . . . . . . . . . . . . . 8
	6. Security Considerations . . . . . . . . . . . . . . . . . . . 8		6. Security Considerations . . . . . . . . . . . . . . . . . . . 8
	6.1. Authentication Credentials and Idle Clients . . . . . . . 8		6.1. Authentication Credentials and Idle Clients . . . . . . . 8
	7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 9		7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 9
	8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 9		8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 9
	8.1. Normative References . . . . . . . . . . . . . . . . . . . 9		8.1. Normative References . . . . . . . . . . . . . . . . . . . 9
	8.2. Informative References . . . . . . . . . . . . . . . . . . 9		8.2. Informative References . . . . . . . . . . . . . . . . . . 9
	Appendix A. Compatibility with Previous Versions . . . . . . . . 9		Appendix A. Compatibility with Previous Versions . . . . . . . . 10
	A.1. Changes from RFC 2616 . . . . . . . . . . . . . . . . . . 9		A.1. Changes from RFC 2616 . . . . . . . . . . . . . . . . . . 10
	Appendix B. Change Log (to be removed by RFC Editor before		Appendix B. Change Log (to be removed by RFC Editor before
	publication) . . . . . . . . . . . . . . . . . . . . 9		publication) . . . . . . . . . . . . . . . . . . . . 10
	B.1. Since RFC2616 . . . . . . . . . . . . . . . . . . . . . . 10		B.1. Since RFC2616 . . . . . . . . . . . . . . . . . . . . . . 10
	B.2. Since draft-ietf-httpbis-p7-auth-00 . . . . . . . . . . . 10		B.2. Since draft-ietf-httpbis-p7-auth-00 . . . . . . . . . . . 10
	B.3. Since draft-ietf-httpbis-p7-auth-01 . . . . . . . . . . . 10		B.3. Since draft-ietf-httpbis-p7-auth-01 . . . . . . . . . . . 10
	B.4. Since draft-ietf-httpbis-p7-auth-02 . . . . . . . . . . . 10		B.4. Since draft-ietf-httpbis-p7-auth-02 . . . . . . . . . . . 10
	B.5. Since draft-ietf-httpbis-p7-auth-03 . . . . . . . . . . . 10		B.5. Since draft-ietf-httpbis-p7-auth-03 . . . . . . . . . . . 10
	Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10		B.6. Since draft-ietf-httpbis-p7-auth-04 . . . . . . . . . . . 10
			Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
	Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 11		Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 11
	Intellectual Property and Copyright Statements . . . . . . . . . . 14		Intellectual Property and Copyright Statements . . . . . . . . . . 15
	1. Introduction		1. Introduction
	This document defines HTTP/1.1 access control and authentication.		This document defines HTTP/1.1 access control and authentication.
	Right now it includes the extracted relevant sections of RFC 2616		Right now it includes the extracted relevant sections of RFC 2616
	with only minor changes. The intention is to move the general		with only minor changes. The intention is to move the general
	framework for HTTP authentication here, as currently specified in		framework for HTTP authentication here, as currently specified in
	[RFC2617], and allow the individual authentication mechanisms to be		[RFC2617], and allow the individual authentication mechanisms to be
	defined elsewhere. This introduction will be rewritten when that		defined elsewhere. This introduction will be rewritten when that
	occurs.		occurs.
	skipping to change at page 4, line 42		skipping to change at page 4, line 42
	implements. An implementation that satisfies all the MUST or		implements. An implementation that satisfies all the MUST or
	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]. [[abnf.dep: ABNF syntax and basic rules will be adopted from		[Part1].
	RFC 5234, see <http://tools.ietf.org/wg/httpbis/trac/ticket/36>.]]
	The ABNF rules below are defined in other specifications:		The ABNF rules below are defined in other specifications:
			OWS = <OWS, defined in [Part1], Section 2.2>
	challenge = <challenge, defined in [RFC2617], Section 1.2>		challenge = <challenge, defined in [RFC2617], Section 1.2>
	credentials = <credentials, defined in [RFC2617], Section 1.2>		credentials = <credentials, defined in [RFC2617], Section 1.2>
	3. Status Code Definitions		3. Status Code Definitions
	3.1. 401 Unauthorized		3.1. 401 Unauthorized
	The request requires user authentication. The response MUST include		The request requires user authentication. The response MUST include
	a WWW-Authenticate header field (Section 4.4) containing a challenge		a WWW-Authenticate header field (Section 4.4) containing a challenge
	applicable to the requested resource. The client MAY repeat the		applicable to the requested resource. The client MAY repeat the
	skipping to change at page 5, line 44		skipping to change at page 5, line 44
	4. Header Field Definitions		4. Header Field Definitions
	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 authentication.		fields related to authentication.
	4.1. Authorization		4.1. Authorization
	A user agent that wishes to authenticate itself with a server--		A user agent that wishes to authenticate itself with a server--
	usually, but not necessarily, after receiving a 401 response--does so		usually, but not necessarily, after receiving a 401 response--does so
	by including an Authorization request-header field with the request.		by including an Authorization request-header field with the request.
	The Authorization field value consists of credentials containing the		The field "Authorization" consists of credentials containing the
	authentication information of the user agent for the realm of the		authentication information of the user agent for the realm of the
	resource being requested.		resource being requested.
	Authorization = "Authorization" ":" credentials		Authorization = "Authorization" ":" OWS Authorization-v
			Authorization-v = credentials
	HTTP access authentication is described in "HTTP Authentication:		HTTP access authentication is described in "HTTP Authentication:
	Basic and Digest Access Authentication" [RFC2617]. If a request is		Basic and Digest Access Authentication" [RFC2617]. If a request is
	authenticated and a realm specified, the same credentials SHOULD be		authenticated and a realm specified, the same credentials SHOULD be
	valid for all other requests within this realm (assuming that the		valid for all other requests within this realm (assuming that the
	authentication scheme itself does not require otherwise, such as		authentication scheme itself does not require otherwise, such as
	credentials that vary according to a challenge value or using		credentials that vary according to a challenge value or using
	synchronized clocks).		synchronized clocks).
	When a shared cache (see Section 9 of [Part6]) receives a request		When a shared cache (see Section 9 of [Part6]) receives a request
	containing an Authorization field, it MUST NOT return the		containing an Authorization field, it MUST NOT return the
	corresponding response as a reply to any other request, unless one of		corresponding response as a reply to any other request, unless one of
	skipping to change at page 6, line 36		skipping to change at page 6, line 38
	subsequent request. But if the response is stale, all caches		subsequent request. But if the response is stale, all caches
	MUST first revalidate it with the origin server, using the		MUST first revalidate it with the origin server, using the
	request-headers from the new request to allow the origin server		request-headers from the new request to allow the origin server
	to authenticate the new request.		to authenticate the new request.
	3. If the response includes the "public" cache-control directive, it		3. If the response includes the "public" cache-control directive, it
	MAY be returned in reply to any subsequent request.		MAY be returned in reply to any subsequent request.
	4.2. Proxy-Authenticate		4.2. Proxy-Authenticate
	The Proxy-Authenticate response-header field MUST be included as part		The response-header field "Proxy-Authenticate" MUST be included as
	of a 407 (Proxy Authentication Required) response. The field value		part of a 407 (Proxy Authentication Required) response. The field
	consists of a challenge that indicates the authentication scheme and		value consists of a challenge that indicates the authentication
	parameters applicable to the proxy for this Request-URI.		scheme and parameters applicable to the proxy for this Request-URI.
	Proxy-Authenticate = "Proxy-Authenticate" ":" 1#challenge		Proxy-Authenticate = "Proxy-Authenticate" ":" OWS
			Proxy-Authenticate-v
			Proxy-Authenticate-v = 1#challenge
	The HTTP access authentication process is described in "HTTP		The HTTP access authentication process is described in "HTTP
	Authentication: Basic and Digest Access Authentication" [RFC2617].		Authentication: Basic and Digest Access Authentication" [RFC2617].
	Unlike WWW-Authenticate, the Proxy-Authenticate header field applies		Unlike WWW-Authenticate, the Proxy-Authenticate header field applies
	only to the current connection and SHOULD NOT be passed on to		only to the current connection and SHOULD NOT be passed on to
	downstream clients. However, an intermediate proxy might need to		downstream clients. However, an intermediate proxy might need to
	obtain its own credentials by requesting them from the downstream		obtain its own credentials by requesting them from the downstream
	client, which in some circumstances will appear as if the proxy is		client, which in some circumstances will appear as if the proxy is
	forwarding the Proxy-Authenticate header field.		forwarding the Proxy-Authenticate header field.
	4.3. Proxy-Authorization		4.3. Proxy-Authorization
	The Proxy-Authorization request-header field allows the client to		The request-header field "Proxy-Authorization" allows the client to
	identify itself (or its user) to a proxy which requires		identify itself (or its user) to a proxy which requires
	authentication. The Proxy-Authorization field value consists of		authentication. The Proxy-Authorization field value consists of
	credentials containing the authentication information of the user		credentials containing the authentication information of the user
	agent for the proxy and/or realm of the resource being requested.		agent for the proxy and/or realm of the resource being requested.
	Proxy-Authorization = "Proxy-Authorization" ":" credentials		Proxy-Authorization = "Proxy-Authorization" ":" OWS
			Proxy-Authorization-v
			Proxy-Authorization-v = credentials
	The HTTP access authentication process is described in "HTTP		The HTTP access authentication process is described in "HTTP
	Authentication: Basic and Digest Access Authentication" [RFC2617].		Authentication: Basic and Digest Access Authentication" [RFC2617].
	Unlike Authorization, the Proxy-Authorization header field applies		Unlike Authorization, the Proxy-Authorization header field applies
	only to the next outbound proxy that demanded authentication using		only to the next outbound proxy that demanded authentication using
	the Proxy-Authenticate field. When multiple proxies are used in a		the Proxy-Authenticate field. When multiple proxies are used in a
	chain, the Proxy-Authorization header field is consumed by the first		chain, the Proxy-Authorization header field is consumed by the first
	outbound proxy that was expecting to receive credentials. A proxy		outbound proxy that was expecting to receive credentials. A proxy
	MAY relay the credentials from the client request to the next proxy		MAY relay the credentials from the client request to the next proxy
	if that is the mechanism by which the proxies cooperatively		if that is the mechanism by which the proxies cooperatively
	authenticate a given request.		authenticate a given request.
	4.4. WWW-Authenticate		4.4. WWW-Authenticate
	The WWW-Authenticate response-header field MUST be included in 401		The WWW-Authenticate response-header field MUST be included in 401
	(Unauthorized) response messages. The field value consists of at		(Unauthorized) response messages. The field value consists of at
	least one challenge that indicates the authentication scheme(s) and		least one challenge that indicates the authentication scheme(s) and
	parameters applicable to the Request-URI.		parameters applicable to the Request-URI.
	WWW-Authenticate = "WWW-Authenticate" ":" 1#challenge		WWW-Authenticate = "WWW-Authenticate" ":" OWS WWW-Authenticate-v
			WWW-Authenticate-v = 1#challenge
	The HTTP access authentication process is described in "HTTP		The HTTP access authentication process is described in "HTTP
	Authentication: Basic and Digest Access Authentication" [RFC2617].		Authentication: Basic and Digest Access Authentication" [RFC2617].
	User agents are advised to take special care in parsing the WWW-		User agents are advised to take special care in parsing the WWW-
	Authenticate field value as it might contain more than one challenge,		Authenticate field value as it might contain more than one challenge,
	or if more than one WWW-Authenticate header field is provided, the		or if more than one WWW-Authenticate header field is provided, the
	contents of a challenge itself can contain a comma-separated list of		contents of a challenge itself can contain a comma-separated list of
	authentication parameters.		authentication parameters.
	5. IANA Considerations		5. IANA Considerations
	skipping to change at page 9, line 16		skipping to change at page 9, line 20
	[[anchor2: TBD.]]		[[anchor2: TBD.]]
	8. References		8. References
	8.1. Normative References		8.1. 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.
	[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.
	[RFC2617] Franks, J., Hallam-Baker, P., Hostetler, J., Lawrence, S.,		[RFC2617] Franks, J., Hallam-Baker, P., Hostetler, J., Lawrence, S.,
	Leach, P., Luotonen, A., and L. Stewart, "HTTP		Leach, P., Luotonen, A., and L. Stewart, "HTTP
	Authentication: Basic and Digest Access Authentication",		Authentication: Basic and Digest Access Authentication",
	RFC 2617, June 1999.		RFC 2617, June 1999.
	8.2. Informative References		8.2. Informative References
	skipping to change at page 10, line 13		skipping to change at page 10, line 19
	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-p7-auth-00		B.2. Since draft-ietf-httpbis-p7-auth-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"
	B.3. Since draft-ietf-httpbis-p7-auth-01		B.3. Since draft-ietf-httpbis-p7-auth-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 Explicitly import BNF rules for "challenge" and "credentials" from		o Explicitly import BNF rules for "challenge" and "credentials" from
	RFC2617.		RFC2617.
	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-p7-auth-02		B.4. Since draft-ietf-httpbis-p7-auth-02
	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-p7-auth-03		B.5. Since draft-ietf-httpbis-p7-auth-03
			B.6. Since draft-ietf-httpbis-p7-auth-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
	4		4
	401 Unauthorized (status code) 5		401 Unauthorized (status code) 5
	407 Proxy Authentication Required (status code) 5		407 Proxy Authentication Required (status code) 5
	A		A
	Authorization header 5		Authorization header 5
	G		G
	Grammar		Grammar
	Authorization 5		Authorization 5
			Authorization-v 5
	challenge 4		challenge 4
	credentials 4		credentials 4
	Proxy-Authenticate 6		Proxy-Authenticate 6
			Proxy-Authenticate-v 6
	Proxy-Authorization 7		Proxy-Authorization 7
			Proxy-Authorization-v 7
	WWW-Authenticate 7		WWW-Authenticate 7
			WWW-Authenticate-v 7
	H		H
	Headers		Headers
	Authorization 5		Authorization 5
	Proxy-Authenticate 6		Proxy-Authenticate 6
	Proxy-Authorization 7		Proxy-Authorization 7
	WWW-Authenticate 7		WWW-Authenticate 7
	P		P
	Proxy-Authenticate header 6		Proxy-Authenticate header 6
End of changes. 32 change blocks.
	33 lines changed or deleted		59 lines changed or added
This html diff was produced by rfcdiff 1.35. The latest version is available from http://tools.ietf.org/tools/rfcdiff/