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Topic: Delta encoding

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	RFC 3229 (rfc3229) - Delta encoding in HTTP
		If the difference, or "delta", between the two instances could be sent to the client instead of the entire new instance, a client holding a cached copy of the old instance could apply the delta to construct the new version.
		More formally, delta encodings are members of a potentially larger class of transformations on instances, leading to this new term: instance manipulation An operation on one or more instances which may result in an instance being conveyed from server to client in parts, or in more than one response message.
		A client that supports both delta encoding and compression as instance-manipulations signals this by, for example A-IM: diffe, deflate The ordering rule stated in section 10.5.3 requires, if the server uses both instance-manipulations in the response, that compression be applied to the result of the delta encoding, rather than vice versa.
	www.faqs.org /rfcs/rfc3229.html (12305 words)

	Pantek - Expert Linux and Open Source Services: : RFC #3229: Delta encoding in HTTP. J. Mogul, B. Krishnamurthy, F. ... (Site not responding. Last check: 2007-10-09)
		Standards Track [Page 30] RFC 3229 Delta encoding in HTTP January 2002 10.4.1 226 IM Used The server has fulfilled a GET request for the resource, and the response is a representation of the result of one or more instance- manipulations applied to the current instance.
		Standards Track [Page 32] RFC 3229 Delta encoding in HTTP January 2002 This example indicates that the instance has first been delta-encoded using the diffe encoding, then the result of that has been compressed using deflate, and finally one or more ranges of that compressed encoding have been selected.
		Standards Track [Page 43] RFC 3229 Delta encoding in HTTP January 2002 12 Security Considerations We are not aware of any aspects of the basic delta encoding mechanism that affect the existing security considerations for the HTTP/1.1 protocol.
	www.pantek.com /library/general/rfc/rfc3229.html (12961 words)

	RFC3229: Delta encoding in HTTP. J. Mogul, B. Krishnamurthy, F. Douglis,... (Site not responding. Last check: 2007-10-09)
		In the second use of Range, it would have to be applied before any delta encoding, because otherwise the Mogul, et al.
		If the client's request had not included the "If-None-Match: "A"" header field, the server could not have computed a delta, since it would not have known which entire instance was already available to Mogul, et al.
		The server's other alternative would be to compute the delta from the uncompressed values, returning: Mogul, et al.
	rfc3229.x42.com (12930 words)

	Zvon - RFC 3229 [Delta encoding in HTTP] - Basic mechanisms
		In this section, we explain the concepts behind delta encoding.
		In order to support the transmission of actual deltas, an extension to HTTP/1.1 needs to provide these features: 1.
		A response using delta encoding must be identified as such.
	www.zvon.org /tmRFC/RFC3229/Output/chapter5.html (2507 words)

	What is HTTP Delta Encoding? - WebReference.com
		In this technique, the origin server sends the difference (or delta) between the old and new instances of the resource, rather than the entire new instance.
		However, this variation is more complex and less mature than basic delta encoding, so I won't cover it further in this article.
		Although the idea of transmitting just the differences between successive pieces of information is an old one (for example, SCCS, RCS, and similar revision-control systems store older revisions as differences), the first use of delta encoding in the Web was developed by Housel and Lindquist at IBM [8].
	webreference.com /internet/software/servers/http/deltaencoding/intro (599 words)

	As I May Think...: Using RFC3229 with Feeds. (Site not responding. Last check: 2007-10-09)
		The other day I wrote that we really should be adopting RFC3229 "Delta Encoding in HTTP" in order to reduce the amount of bandwidth, etc. that is wasted in serving RSS and Atom files.
		Rather, it is item or entry oriented in that deltas are computed not in bytes but rather in whole items or entries.
		The response carries an "IM" response-header field, indicating which delta encoding is used in the response.
	bobwyman.pubsub.com /main/2004/09/using_rfc3229_w.html (2844 words)

	Potential Benefits Of Delta Encoding and Data Compression for HTTP (Corrected Version) - Mogul, Douglis, Feldmann, ... (Site not responding. Last check: 2007-10-09)
		Alternate document: Details Potential benefits of delta encoding and data compression for HTTP (97) Jeffrey C. Mogul, et al.
		Several previous papers have proposed updating cache entries by transferring only the differences, or "delta," between the cached entry and the current value.
		44.7%: Potential benefits of delta encoding and data compression for HTTP - Mogul, al.
	citeseer.ist.psu.edu /mogul97potential.html (585 words)

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