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The code assumes a TLD can be max 4 in length. But this is wrong.
https://github.com/apache/nutch/blob/f011b2193c24e031aafbcfa1e66fc2bcbb59098b/src/plugin/urlfilter-validator/src/java/org/apache/nutch/urlfilter/validator/UrlValidator.java#L280
GitHub Pull Request #362