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https://issues.apache.org/jira/browse/NUTCH-2144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15141296#comment-15141296
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Lewis John McGibbney commented on NUTCH-2144:
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bq. [~chrismattmann] I am not sure if Tika can take an URL and guess possible
mime type without making a HEAD call. Can you point me to an example, if there
is one?
Yes here you go
https://tika.apache.org/1.11/api/index.html?org/apache/tika/detect/NameDetector.html
> 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
> Fix For: 1.12
>
> 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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