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https://issues.apache.org/jira/browse/TAP5-2436?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14693084#comment-14693084
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Jochen Kemnade commented on TAP5-2436:
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If we just catch the exception and return {{null}} from checkIfPage, we'll get
a 404.
> Don't throw an IllgealArgumentException on illegal chars in the url
> -------------------------------------------------------------------
>
> Key: TAP5-2436
> URL: https://issues.apache.org/jira/browse/TAP5-2436
> Project: Tapestry 5
> Issue Type: Improvement
> Components: tapestry-core
> Affects Versions: 5.4
> Reporter: quurks
>
> A few days ago some tool tried to find vulnerabilites by checking urls like
> /pageid=99999' . This lead to dozens of exception reports like
> Exception type: java.lang.IllegalArgumentException
> Message: Input string 'pageid=99999'' is not valid; the character '=' at
> position 7 is not valid.
> This should either be a custom exception type, so it can be handled without
> parsing the IllegalArgumentException message or it should be a 400 - Bad
> request, which would also allow for a custom error page.
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