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https://issues.apache.org/jira/browse/CXF-6849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15217944#comment-15217944
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Sergey Beryozkin commented on CXF-6849:
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Just to clarify: is it a JAX-RS bug ?
> Form parameter names including '%' are not decoded properly
> -----------------------------------------------------------
>
> Key: CXF-6849
> URL: https://issues.apache.org/jira/browse/CXF-6849
> Project: CXF
> Issue Type: Bug
> Affects Versions: 3.1.6
> Reporter: Michael Schilling
>
> Making a POST call that has form parameter name of {{%25}} produces a
> {{BufferUnderflowException}}.
> Additionally, making a POST call with a form parameter name of {{%25}}
> directly followed by any character that can't represent a hexadecimal value
> will produce a {{RuntimeException}} stating {{"Invalid URL encoding: not a
> valid digit (radix 16): <byte value>"}}.
> The source of these exceptions are from {{UrlUtils#urlDecode}} and
> {{UrlUtils#digit16}}.
> Note: {{%25}} is the URL encoded version of {{%}}. The HTTP request send has
> a desired form parameter of {{%}}.
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