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https://issues.apache.org/jira/browse/CONFIGURATION-415?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12869493#action_12869493
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Joerg Schaible commented on CONFIGURATION-415:
----------------------------------------------
Useful:
http://maven.apache.org/plugin-developers/common-bugs.html#Converting_between_URLs_and_Filesystem_Paths
> ConfigurationUtils.fileFromURL mangles files with '+' (plus sign) in the name
> -----------------------------------------------------------------------------
>
> Key: CONFIGURATION-415
> URL: https://issues.apache.org/jira/browse/CONFIGURATION-415
> Project: Commons Configuration
> Issue Type: Bug
> Affects Versions: 1.6
> Reporter: Brian Stiles
> Attachments: FileFromUrlTest.java
>
>
> Attached is a sample program that demonstrates the problem. The following is
> the method in ConfigurationUtils in question:
> public static File fileFromURL(URL url)
> {
> ...
> return new File(URLDecoder.decode(url.getPath()));
> ...
> }
> URLDecoder (poorly named) decodes data encoded in the
> application/x-www-form-urlencoded MIME format. This format is commonly used
> to encode HTML form data. It is not intended for encoding URLs, though the
> formats are similar.
> The operative difference is that the MIME format allows the use of the plus
> sign ('+') to represent spaces, whereas URLs must have spaces hex encoded
> ('%20'). Files may have plus signs in the name, and therefore, decoding the
> plus sign as a space produces a different path.
> See attached code demonstrating the problem.
> Reference: http://www.w3.org/MarkUp/html-spec/html-spec_8.html#SEC8.2.1
> and http://www.ietf.org/rfc/rfc1738.txt
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