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Posted to dev@nutch.apache.org by "Chang Fan (JIRA)" <ji...@apache.org> on 2018/09/17 16:04:00 UTC
[jira] [Closed] (NUTCH-2646) CLONE - Caching of redirected
robots.txt may overwrite correct robots.txt rules
[ https://issues.apache.org/jira/browse/NUTCH-2646?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Chang Fan closed NUTCH-2646.
----------------------------
Resolution: Resolved
> 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
> 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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