I've found some great tools for reducing PNG and HTML output. I'm not
sure if a proxy server could be modified to automatically use these
tools / codebases, but if successful, one could drastically reduce the
amount of bandwidth required to deliver content to clients. Ideally, one
would optimize at the source end, but this cannot be expected for the
vast majority of the web.
http://optipng.sourceforge.net/
http://tidy.sourceforge.net/
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