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https://issues.apache.org/jira/browse/NUTCH-1941?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14315647#comment-14315647
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Lewis John McGibbney commented on NUTCH-1941:
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Perfect example of where this scenario arises is below
http://support.hostgator.com/articles/specialized-help/technical/apache-htaccess/user-agent-blocks-mainly-for-bots
> Optional rolling http.agent.name's
> ----------------------------------
>
> Key: NUTCH-1941
> URL: https://issues.apache.org/jira/browse/NUTCH-1941
> Project: Nutch
> Issue Type: Bug
> Components: fetcher, protocol
> Reporter: Lewis John McGibbney
> Priority: Trivial
>
> In some scenarios, even whilst adhering to fetcher.crawl.delay, web admins
> can block your fetcher based merely on your crawler name.
> I propose the ability to implement rolling http.agent.name's which could be
> substituted every 5 seconds for example. This would mean that successive
> requests to the same domain would be sent with different http.agent.name.
> This behavior should be off by default.
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