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From "Sebastian Nagel (JIRA)" <j...@apache.org>
Subject [jira] [Created] (NUTCH-2581) Caching of redirected robots.txt may overwrite correct robots.txt rules
Date Tue, 22 May 2018 13:04:00 GMT
Sebastian Nagel created NUTCH-2581:
--------------------------------------

             Summary: 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: 1.14, 2.3.1
            Reporter: Sebastian Nagel
             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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