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The Web Intermediary (WBI) Developer Kit for Java provides a convenient and flexible API for programming intermediaries on the Web. An intermediary is a programmable proxy. More precisely, intermediaries are computational entities that lie along the HTTP stream and are programmed to tailor, customize, personalize, or otherwise enhance data as it flows along the stream. A caching Web proxy is a simple example of an HTTP intermediary. Intermediary-based programming is particularly useful if you want to add functionality to a system but cannot modify the data producer (e.g., server or database) or the data consumer (e.g., browser). One obvious application for intermediaries on the Web is transcoding applications, in which data of one form is transformed into another form; for instance, to transform XML into HTML to be viewed by a Web browser, or to transform images with millions of colors to ones with just a few for displays with limited color depth. The key is that the server need not deliver different content in these cases, but some intermediary processes can operate on the usual data, transforming the data as needed. There are many applications of Web intermediaries for the personalization of Web pages.
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