RE: DRP and content identifiers.

I would propose an alternative mechanism for handling delta. The
enclosed draft is completely stolen from:
J. Mogul, F. Douglis, A. Feldmann, B. Krishnamurthy, 'Potential benefits
of delta encoding and data compression for HTTP', Digital WRL Research
Report 97/4, July 1997, <URL:
http://www.research.digital.com/wrl/techreports/abstracts/97.4.html>

I have submitted it for review to the authors of 97/4 but Jeff is on
vacation until later this week. Once he is back the 97/4 authors have
said they will look it over and let me know what they think. Once I have
their feedback I will submit the draft as an ID.

As such, the document is not appropriate for wide spread distribution
and I have removed all authoring and other identifying information from
it. However I thought that it would be useful to present to this mailing
list.

		Yaron

 

> -----Original Message-----
> From:	Arthur van Hoff [SMTP:avh@marimba.com]
> Sent:	Monday, October 06, 1997 12:52 PM
> To:	Push Workshop; DRP Mailing List
> Subject:	DRP and content identifiers.
> 
> Hi,
> 
> In previous mail we have discussed the use of globally unique 
> content identifiers in the DRP proposal. As a result of these
> discussion I would like to make some minor changes to the DRP 
> proposal. The changes include some suggestions for modifications 
> to the HTTP/1.1 specification.
> 
> * Globally Unique Content Identifiers
> 
> As suggested by Larry Masinter we should start using content
> identifiers 
> as defined in RFC 2111
> (http://www.ics.uci.edu/pub/ietf/uri/rfc2111.txt).
> 
> As a result the notation for an MD5 and SHA checksum content
> identifiers 
> will be as follows:
> 
>   FNG4c6MJLdDEY1rcoGb4pQ==@md5.w3.org
>   thvDyvhfIqlvFe+A9MYgxAfm1q5=@sha.w3.org
> 
> The first part of a checksum based content identifier  will be 
> the base-64 notation of the checksum, the address part identifies
> the type of checksum. Unlike the base64 specification I suggest 
> that the trailing '=' signs are optional.
> 
> For MD5 we shall use the "md5.w3.org" address, for SHA checksums we 
> shall use "sha.w3.org". This way anyone can create new checksum types 
> by appending the appropriate domain name to the content identifier.
> 
> * Globally Unique Entity Tags
> 
> We would like to suggest the following change to the definition of 
> entity-tag in section 3.11 of the HTTP/1.1 specification:
> 
>    entity-tag         = [ weak | global ] opaque-tag
>    weak               = "W/"
>    global             = "G/"
>    opaque-tag         = quoted-string | quoted-content-id
>    quoted-content-id  = <"> content-id <">
> 
> This will allow for the use of globally unique entity tags. To avoid 
> conflicts a globally unique entity-tag should consist of a quoted
> content identifier as described above. 
> 
> The presents of a global entity tag identifies the content of the
> entity. A proxy can assume that two entities with identical global
> entity tags refer to the same content, regardless of their origin.
> 
> * Differential Range Specifier
> 
> To do differential update requests as described in the DRP proposal
> we can use the Range header. In this case the differential reply is
> viewed as a "range" of the new document given an older version. This
> requires a small change to the definition of ranges-specifier in 
> section 14.36.1 of the HTTP/1.1 specification:
> 
>   ranges-specifier       = byte-ranges-specifier |
> diff-range-specifier
>   diff-ranges-specifier  = "diff" "=" quoted-content-id
> 
> To get a differential update a client must specify the content
> identifier
> of the current version of the resource. The server can reply with a
> 206
> reply (partial content) or a 200 reply (OK).
> 
> Please send me your comments. I will update the DRP specification
> accordingly and circulate the updated document.
> 
> Have fun,
> 
> 	Arthur van Hoff << File: Card for Arthur van Hoff >> 

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end

Received on Monday, 6 October 1997 16:33:45 UTC