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https://issues.apache.org/jira/browse/NUTCH-2581?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16502949#comment-16502949
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ASF GitHub Bot commented on NUTCH-2581:
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sebastian-nagel opened a new pull request #342: NUTCH-2581 Caching of
redirected robots.txt may overwrite correct robots.txt rules (fix for 2.x)
URL: https://github.com/apache/nutch/pull/342
- only cache redirected robots.txt rules if the target URL path and
query equal /robots.txt
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> Caching of redirected robots.txt may overwrite correct robots.txt rules
> -----------------------------------------------------------------------
>
> Key: NUTCH-2581
> URL: https://issues.apache.org/jira/browse/NUTCH-2581
> Project: Nutch
> Issue Type: Bug
> Components: fetcher, robots
> Affects Versions: 2.3.1, 1.14
> Reporter: Sebastian Nagel
> Assignee: Sebastian Nagel
> Priority: Critical
> Fix For: 2.4, 1.15
>
>
> Redirected robots.txt rules are also cached for the target host. That may
> cause that the correct robots.txt rules are never fetched. E.g.,
> http://wyomingtheband.com/robots.txt redirects to
> https://www.facebook.com/wyomingtheband/robots.txt. Because fetching fails
> with a 404 bots are allowed to crawl wyomingtheband.com. The rules is
> erroneously also cached for the redirect target host www.facebook.com which
> is clear regarding their [robots.txt|https://www.facebook.com/robots.txt]
> rules and does not allow crawling.
> Nutch may cache redirected robots.txt rules only if the path part (in doubt,
> including the query) of the redirect target URL is exactly {{/robots.txt}}.
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