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USENIX Technical Program - Abstract - Internet Technologies & Systems 99
Compression Proxy Server: Design and Implementation
Chi-Hung Chi, Jing Deng, and Yan-Hong Lim, National University of Singapore
Abstract
Automatic data compression in the web proxy server is an important
mechanism that can potentially reduce network bandwidth consumption
and web access latency significantly. However, unlike traditional data
compression, web protocols and data have unique characteristics that
make compression challenging. These include data block streaming, wide
range of data object sizes and types, and real-time response. In this
paper, we focus on automatic web data compression in the HTTP proxy
server. A new classification of web data compression based on system
complexity and HTTP requirements is proposed: stream, block and file
compression. Then, the concept of hybrid web data compression is
introduced. To understand the potentials of web data compression
better, an implementation of the proposed hybrid compression in the
Squid proxy server is described. The result is very promising, as
about 30% of the bandwidth can be saved easily. Furthermore, even with
a low end Pentium 266 MHz PC as the proxy machine, the compression
overhead is less than 1% of the transfer time.
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