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https://issues.apache.org/jira/browse/NUTCH-2554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16433822#comment-16433822
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Sebastian Nagel commented on NUTCH-2554:
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Thanks, for the review! PR is merged, see NUTCH-2012.

> parserchecker can't fetch some URLs
> -----------------------------------
>
>                 Key: NUTCH-2554
>                 URL: https://issues.apache.org/jira/browse/NUTCH-2554
>             Project: Nutch
>          Issue Type: Bug
>            Reporter: Gerard Bouchar
>            Priority: Major
>             Fix For: 1.15
>
>
> The parserchecker (org.apache.nutch.parse.ParserChecker) calls 
> _URLUtil.toASCII_ on the url it is given, reencoding already percent-encoded 
> URLs.
> For instance, let's say we want to query 
> [http://example.com|http://example.com_/], passing a GET parameter with name 
> 'q' and value '/'. '/' is a special character, and thus has to be encoded 
> before being sent.
>  If we pass '[_http://example.com/?q=/_'|http://example.com/?q=/%27] to the 
> parserchecker, then it doesn't encode the '/', and tries to fetch the URL as 
> is, which is invalid.
>  If we try to encode the parameter beforehand, and call the parsechecker with 
> 'http://example.com/?q=%2F', then it encodes the '%' sign to '%25', and thus 
> fetches '[http://example.com/?q=%252F'.|http://example.com/?q=%252F%27.]
> This actually makes it impossible to fetch the correct URL 
> ([http://example.com/?q=%2F]) from the parserchecker.



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