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https://issues.apache.org/jira/browse/NUTCH-731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12722214#action_12722214
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Julien Nioche commented on NUTCH-731:
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Here is an example which the patch helps addressing
curl http://wizardhq.com/robots.txt
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>301 Moved Permanently</title>
</head><body>
<h1>Moved Permanently</h1>
<p>The document has moved <a
href="http://www.wizardhq.com/robots.txt";>here</a>.</p>
</body></html>
again, the ratio of robots_denied status started going up after I wrote the
patch which means that such cases are not so rare
> Redirection of robots.txt in RobotRulesParser
> ---------------------------------------------
>
> Key: NUTCH-731
> URL: https://issues.apache.org/jira/browse/NUTCH-731
> Project: Nutch
> Issue Type: Improvement
> Components: fetcher
> Affects Versions: 1.0.0
> Reporter: Julien Nioche
> Attachments: NUTCH-731.patch
>
>
> The patch attached allows to follow one level of redirection for robots.txt
> files. A similar issue was mentioned in NUTCH-124 and has been marked as
> fixed a long time ago but the problem remained, at least when using Fetcher2
> . Mathijs Homminga pointed to the problem in a mail to the nutch-dev list in
> March.
> I have been using this patch for a while now on a large cluster and noticed
> that the ratio of robots_denied per fetchlist went up, meaning that at least
> we are now getting restrictions we would not have had before (and getting
> less complaints from webmasters at the same time)
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