[jira] [Created] (NUTCH-1752) cache robots.txt rules per protocol:host:port

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

Sebastian Nagel created NUTCH-1752:
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             Summary: cache robots.txt rules per protocol:host:port
                 Key: NUTCH-1752
                 URL: https://issues.apache.org/jira/browse/NUTCH-1752
             Project: Nutch
          Issue Type: Bug
          Components: protocol
    Affects Versions: 2.2.1, 1.8
            Reporter: Sebastian Nagel
             Fix For: 2.3, 1.9


HttpRobotRulesParser caches rules from {{robots.txt}} per "protocol:host" (before NUTCH-1031 caching was per "host" only). The caching should be per "protocol:host:port". In doubt, a request to a different port may deliver a different {{robots.txt}}. 
Applying robots.txt rules to a combination of host, protocol, and port is common practice:
[Norobots RFC 1996 draft|http://www.robotstxt.org/norobots-rfc.txt] does not mention this explicitly (could be derived from examples) but others do:
* [Wikipedia|http://en.wikipedia.org/wiki/Robots.txt]: "each protocol and port needs its own robots.txt file"
* [Google webmasters|https://developers.google.com/webmasters/control-crawl-index/docs/robots_txt]: "The directives listed in the robots.txt file apply only to the host, protocol and port number where the file is hosted."




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