Broken parsers; the importance of BASE
Some of these parsers are harmfully broken because they don't obey the rules set for resolving relative URI's, in particular with respect to any set BASE element, yet do some sort of prefetching or following in-document links for other reasons.
Among these broken parsers are parsers used within proxy software (e.g. Novell's BorderManager), Firefox extensions (e.g. Fasterfox) and searchengine crawlers (e.g. GoogleBot).
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