RabbIT is a proxy for HTTP, it is HTTP/1.1 compliant (testing being done with Co-Advisors test, http://coad.measurement-factory.com/) and should hopefully support the latest HTTP/x.x in the future. Its main goal is to speed up surfing over slow links by removing unnecessary parts (like background images) while still showing the page mostly like it is. For example, we try not to ruin the page layout completely when we remove unwanted advertising banners. The page may sometimes even look better after filtering as you get rid of pointless animated gif images.
Since filtering the pages is a "heavy" process, RabbIT caches the pages it filters but still tries to respect cache control headers and the old style "pragma: no-cache". RabbIT also accepts request for nonfiltered pages by prepending "noproxy" to the adress (like http://noproxy.www.altavista.com/). Optionally, a link to the unfiltered page can be inserted at the top of each page automatically.
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