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https://issues.apache.org/jira/browse/NUTCH-2065?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15068757#comment-15068757
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Sebastian Nagel commented on NUTCH-2065:
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* in general: wouldn't a URL normalizer be preferable? If URLs of one protocol 
are suppressed, missing links may get lost. Some documents of a site which uses 
https mostly may be referenced from few http pages only.
* before domain url filter was agnostic regarding the protocol: shouldn't this 
behaviour be kept in all cases, i.e., also for ftp? Almost everything now is 
http or https, but may we should keep the interpretation of "no protocol 
specified" -> "any protocol allowed".

> Domain URL filter to support protocols
> --------------------------------------
>
>                 Key: NUTCH-2065
>                 URL: https://issues.apache.org/jira/browse/NUTCH-2065
>             Project: Nutch
>          Issue Type: Improvement
>    Affects Versions: 1.10
>            Reporter: Markus Jelsma
>         Attachments: NUTCH-2065.patch, NUTCH-2065.patch
>
>
> The filter allows all protocols for all whitelisted domains, hosts or 
> suffixes but it usually makes little sense to index both http and https URL's 
> of the same domain. This is not unlike the host URL filter, which prevents 
> indexing of duplicate hosts e.g. apache.org and www.apache.org.



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