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by kolme 3119 days ago
URLs have been a security issue for browsers in the past, and can get pretty hairy. From UTF-8 coded domain names to whatever you want to "urlencode". For example, you can encode whole images into URLs, for embedding them in CSS files.

Old IE versions had a hard URL length limit and were very picky with the characters in domain names, both limitations included as "security fixes" (which broke the standards).