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It makes sense to me now.
It redirects to the referer URL, which, if that's not set, defaults to '.', or /queue/ (which isn't mean to be used interactively, so there's nothing there – 404).
This is why I was asking where /queue/cancelItem was advertised as being part of the Jenkins API – it's not documented in /queue/api. If it's advertised nowhere, and you're just using it because it exists, then there's no reasonable expectation of URLs used by the Jenkins UI to also work outside that context.