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https://issues.apache.org/jira/browse/NUTCH-2144?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on NUTCH-2144 started by Chris A. Mattmann.
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> Plugin to override db.ignore.external to exempt interesting external domain
> URLs
> --------------------------------------------------------------------------------
>
> Key: NUTCH-2144
> URL: https://issues.apache.org/jira/browse/NUTCH-2144
> Project: Nutch
> Issue Type: New Feature
> Components: crawldb, fetcher
> Reporter: Thamme Gowda N
> Assignee: Chris A. Mattmann
> Priority: Minor
> Attachments: ignore-exempt.patch, ignore-exempt.patch
>
>
> Create a rule based urlfilter plugin that allows focused crawler
> (db.ignore.external.links=true) to fetch static resources from external
> domains.
> The generalized version of this: This plugin should permit interesting URLs
> from external domains (by overriding db.ignore.external). The interesting
> urls are decided from a combination of regex and mime-type rules.
> Concrete use case:
> When using Nutch to crawl images from a set of domains, the crawler needs
> to fetch all images which may be linked from CDNs and other domains. In this
> scenario, allowing all external links and then writing hundreds of regular
> expressions is not feasible for large number of domains.
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