WebExpress: a system for optimizing Web browsing in a wireless environment
MobiCom '96 Proceedings of the 2nd annual international conference on Mobile computing and networking
Removal policies in network caches for World-Wide Web documents
Conference proceedings on Applications, technologies, architectures, and protocols for computer communications
Potential benefits of delta encoding and data compression for HTTP
SIGCOMM '97 Proceedings of the ACM SIGCOMM '97 conference on Applications, technologies, architectures, and protocols for computer communication
Delta algorithms: an empirical analysis
ACM Transactions on Software Engineering and Methodology (TOSEM)
Syntactic clustering of the Web
Selected papers from the sixth international conference on World Wide Web
Communication complexity of document exchange
SODA '00 Proceedings of the eleventh annual ACM-SIAM symposium on Discrete algorithms
A low-bandwidth network file system
SOSP '01 Proceedings of the eighteenth ACM symposium on Operating systems principles
Cluster-Based Delta Compression of a Collection of Files
WISE '02 Proceedings of the 3rd International Conference on Web Information Systems Engineering
Engineering a Differencing and Compression Data Format
ATEC '02 Proceedings of the General Track of the annual conference on USENIX Annual Technical Conference
WWW '03 Proceedings of the 12th international conference on World Wide Web
On the Resemblance and Containment of Documents
SEQUENCES '97 Proceedings of the Compression and Complexity of Sequences 1997
Pastiche: making backup cheap and easy
ACM SIGOPS Operating Systems Review - OSDI '02: Proceedings of the 5th symposium on Operating systems design and implementation
A Framework for the Evaluation of Session Reconstruction Heuristics in Web-Usage Analysis
INFORMS Journal on Computing
ICDE '04 Proceedings of the 20th International Conference on Data Engineering
Efficient randomized pattern-matching algorithms
IBM Journal of Research and Development - Mathematics and computing
Optimistic deltas for WWW latency reduction
ATEC '97 Proceedings of the annual conference on USENIX Annual Technical Conference
Grammar-based codes: a new class of universal lossless source codes
IEEE Transactions on Information Theory
Distributing private data in challenged network environments
Proceedings of the 19th international conference on World wide web
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A number of researchers have studied delta compression techniques for improving the efficiency of web page accesses over slow communication links. Most of these schemes exploit the fact that updated web pages often change only very slightly, thus resulting in very small sizes for the transmitted deltas. However, these schemes are only applicable to a minority of page accesses, and require web or proxy servers to retain potentially many different outdated versions of pages for use as reference files in the encoding. Another approach, studied by Chan and Woo [4], encodes a page with respect to similar files located on the same web server that are already in the client's browser cache.Based on the latter approach, we study different delta compression policies for web access. Our emphasis is on web and proxy server-friendly policies that do not require the maintenance of multiple older versions of a page, but only use reference files accessed by the client within the last few minutes. We compare several policies for identifying appropriate reference files and evaluate their performance on a set of traces. We show that there are very simple policies that achieve significant benefits over gzip compression on most web accesses, and that can be efficiently implemented at web or proxy servers. We also study the potential of file synchronization techniques such as rsync [28] for web access.