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}}.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
