I should have updates soon as I’m debugging the issue and I was able to reproduce locally using Tomcat 9.0.41. Will post back here when I have a proper fix. You can also follow [XWIKI-19444] Uploading an attachment fails when using short URLs - XWiki.org JIRA
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ok I’ve now understood the problem and I’ve summarized it at [XWIKI-19444] Uploading an attachment fails when using short URLs - XWiki.org JIRA
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