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Publications by Type: Conference and Workshop Publications

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Potential benefits of delta encoding and data compression for HTTP
Zitatschlüssel MDFK-PBDEDCH-97
Autor Mogul, Jeffrey C. and Douglis, Fred and Feldmann, Anja and Krishnamurthy, Balachander
Buchtitel SIGCOMM '97: Proceedings of the ACM SIGCOMM '97 conference on Applications, technologies, architectures, and protocols for computer communication
Seiten 181–194
Jahr 1997
ISBN 0-89791-905-X
ISSN 0146-4833
DOI http://dx.doi.org/10.1145/263105.263162
Ort Cannes, France
Adresse New York, NY, USA
Notiz An extended version appeared as MDFK-PBDEDCH-97a.
Verlag ACM Press
Zusammenfassung Caching in the World Wide Web currently follows a naive model, which assumes that resources are referenced many times between changes. The model also provides no way to update a cache entry if a resource does change, except by transferring the resource's entire new value. Several previous papers have proposed updating cache entries by transferring only the differences, or delta, between the cached entry and the current value. In this paper, we make use of dynamic traces of the full contents of HTTP messages to quantify the potential benefits of delta-encoded responses. We show that delta-encoding can provide remarkable improvements in response-size and response-delay for an important set of HTTP content types. We also show the added benefit of data compression, and that the combination of delta-encoding and data compression yields the best results. We propose specific extensions to the HTTP protocol for delta-encoding and data compression. These extensions are compatible with existing implementations and specifications, yet allow efficient use of a variety of encoding techniques.
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