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https://issues.apache.org/jira/browse/NUTCH-1319?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Markus Jelsma resolved NUTCH-1319.
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Resolution: Fixed
Committed for 1.6 in rev. 1349236.
> HostNormalizer
> --------------
>
> Key: NUTCH-1319
> URL: https://issues.apache.org/jira/browse/NUTCH-1319
> Project: Nutch
> Issue Type: New Feature
> Reporter: Markus Jelsma
> Assignee: Markus Jelsma
> Fix For: 1.6
>
> Attachments: NUTCH-1319-1.5-1.patch
>
>
> Nutch would benefit from having a host normalizer. A host normalizer maps a
> given host to the desired host. A basic example is to map www.apache.org to
> apache.org. The Apache website is one of many on the internet that has a
> duplicate website on the same domain just because it allows both www and
> non-www to return HTTP 200 and proper content.
> It is also able to handle wildcards such as *.example.org to example.org if
> there are multiple sub domains that actually point to the same website.
> Large internet crawls tend to get polluted very quickly due to these
> problems. It also leads to skewed scores in the webgraph as different
> websites link to different versions of the same duplicate website.
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