[jira] [Reopened] (NUTCH-2646) CLONE - Caching of redirected robots.txt may overwrite correct robots.txt rules

["Sebastian Nagel (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/NUTCH-2646?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sebastian Nagel reopened NUTCH-2646:
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> CLONE - Caching of redirected robots.txt may overwrite correct robots.txt rules
> -------------------------------------------------------------------------------
>
>                 Key: NUTCH-2646
>                 URL: https://issues.apache.org/jira/browse/NUTCH-2646
>             Project: Nutch
>          Issue Type: Bug
>          Components: fetcher, robots
>    Affects Versions: 2.3.1, 1.14
>            Reporter: Chang Fan
>            Assignee: Sebastian Nagel
>            Priority: Critical
>
> 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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