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https://issues.apache.org/jira/browse/VALIDATOR-318?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13622200#comment-13622200
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Rafał Figas commented on VALIDATOR-318:
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Joerg, yes, but it still regards DNS in general (like 1034, 1035 and 2181) and
DNS has very little limitations. Here we have particular case of Internet host,
so this causes additional confusions as for Internet hosts there are RFC952 and
RFC1193.
> URLs with a hostname containing an underscore are not validated
> ---------------------------------------------------------------
>
> Key: VALIDATOR-318
> URL: https://issues.apache.org/jira/browse/VALIDATOR-318
> Project: Commons Validator
> Issue Type: Bug
> Affects Versions: 1.3.1 Release, 1.4.0 Release
> Reporter: Rafał Figas
>
> isValid returns false for following URL:
> http://www.nasza_sp77.republika.pl/
> which seems to be perfectly legal according to RFC:
> http://tools.ietf.org/html/rfc3986#section-2.3
> And a discussions here:
> http://stackoverflow.com/questions/2180465/can-someone-have-a-subdomain-with-an-underscore-in-it
> http://stackoverflow.com/questions/10959757/the-use-of-the-underscore-in-host-names
> Test code:
> {code}
> String schemes[] = { "http", "https" };
> UrlValidator validator = new UrlValidator(schemes, UrlValidator.NO_FRAGMENTS);
> return validator.isValid("http://www.nasza_sp77.republika.pl/";);
> {code}
> This is somewhat similar to VALIDATOR-204, but that was for path part of URL
> and this one is for underscore in hostname.
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