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- CURRENT_MEETING_REPORT_
-
- Reported by Ari Luotonen/Netscape Communications Corporation
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- Minutes of the HyperText Transfer Protocol Working Group (HTTP)
-
-
- Objectives of the Meeting
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- The objectives for the meeting were to:
-
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- o Finalize the HTTP/1.0 draft, as the final version of it will be
- made available the following week.
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- o Go through the extensions and decide which ones will be included in
- HTTP/1.1.
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- o Get a status report on HTTP-NG.
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- o Get a status report on the Digest Authentication Scheme.
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- o Introduce Mediated Digest Authentication.
-
-
- HTTP-NG Status Report
-
- The new features added to the second checkpoint draft were briefly
- introduced:
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- o Included the specification for initialization of the session; at
- initialization the level of synchronization is negotiated (among
- other things), as well as variables defined to be used later in
- that session.
-
- o Canceling and suspending a request. Suspending was added to make
- it possible to stop, e.g., image transfer if the user follows a
- link to another page, so that the transfer can be resumed later if
- the user returns to the original document (or if the next page
- contains the same image).
-
- o Two methods for retrieving documents:
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- - Simple GET for the same level of functionality as HTTP/1.0
- provides.
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- - Full GET for receiving only a range of a document,
- metainformation, or a variant of the resource (different
- language, format, version).
-
- o HTTP-TOS request for allowing existing applications to send
- old-style requests, and to allow S-HTTP to work.
-
-
- HTTP/1.0
-
- Roy Fielding and Henrik Frystyk will produce the final draft by the end
- of the following week. If that one does not have unresolved points, it
- will be submitted to the IESG, and may finally become the final HTTP/1.0
- Standard.
-
- Mainly the suggested changes were quickly walked through: Accept: */*
- default q factor 0.5; understanding the asctime() Date: format only
- required by proxies; value of From: field is mailbox instead of
- addr-spec; and Location: is a valid header to give the new location in
- a redirect; use of the URI: header is not mandatory.
-
- Making Language: header hierarchical raised quite a bit of discussion.
- It was brought up that all the languages cannot be described
- hierarchically -- there are dialects of certain languages that are not
- understandably by people speaking another dialect of the same language
- (Saame was an example).
-
-
- HTTP/1.1
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- HTTP/1.1 will be published as an Internet-Draft before the Stockholm
- IETF meeting in July 1995.
-
- The following extensions to HTTP/1.1 were discussed:
-
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- o Decided to have clients treat unknown 3xx series response codes by
- default as 302 redirect (moved temporarily). The Location: header
- should then be there, and if not, URI: should be used.
-
- This was the suggestion for having an automatable subset of HTML
- for handling 300 Multiple Choices and 406 None Acceptable status
- codes. Clients supporting this would capture this special format,
- and perform the function of selecting the best copy automatically.
- Clients not supporting this would display the HTML normally, which
- would construct an itemized list with hyperlinks to those multiple
- choices.
-
- This suggestion got resistance -- HTTP and HTML should not be bound
- together. Also, there are cases when HTML cannot be displayed,
- such as when retrieving inlined images.
-
- It was then suggested that these multiple choices be provided as
- HTTP header fields. The argument there was that the headers are
- flat, and there are problems providing lists of choices.
-
- The conclusion was that the Location: header be the default place
- to redirect temporarily.
-
- o Orig-URI: for expressing the entire URL that initiated this
- request, so that the hostname is also available to the server. It
- was brought up that this will not be backwards compatible, and that
- behavior is now different with browsers that do not support this.
- This is the vanity hostname issue, which has been so far solved by
- having servers respond to multiple IP addresses, which wastes
- resources. However, service providers are so desperate that they
- are in fact willing to accept a partial solution which will not
- work with old browsers.
-
- o Connection: and Keep-Alive: for support for multiple requests
- over a single connection.
-
- o Refresh: header for client-pull.
-
- o Proxy-Authenticate: and Proxy-Authorization: for user
- authentication for proxies, just like in HTTP/1.0.
-
- o Changes to headers: allow HTTP Date to use +0000 to indicate GMT;
- extend Pragma: header; make Expires: accept delta-seconds.
-
- o Two new methods: OPTIONS for getting allowed methods, and MULTI
- for allowing session-long negotiation of Accept-* headers,
- authentication and privacy extensions.
-
- o Digest authentication scheme (discussed later in the meeting).
-
-
-
- Extensions for HTTP
-
- Dave Kristol briefly described his view of the framework for the
- extensions. The Internet-Draft for this proposal is
- draft-kristol-http-extensions-00.txt. Basically, to use wrapping,
- packetizing and recursion to handle messages, to have a small yet
- relatively versatile system for security, payment information,
- packetizing and compression.
-
-
-
- Digest Authentication Scheme
-
- Eric Sink gave a status report on the Digest Authentication Scheme. The
- latest Internet-Draft is available as draft-ietf-http-digest-aa-01.txt.
-
- The possibility for a man-in-the-middle attack that used to exist in the
- previous version has been removed. Also, message integrity check is now
- available as an option.
-
-
-
- Mediated Digest Authentication
-
- Dave Raggett has submitted an Internet-Draft,
- draft-ietf-http-mda-00.txt, on Mediated Digest Authentication scheme
- that uses a trusted third party to authenticate both the client and the
- server. This scheme is a strict superset of the Digest Authentication
- Scheme.
-
-