Github user alopresto commented on the issue:
https://github.com/apache/nifi/pull/2908
I believe there are some other locations in the code that forward requests
to `/message` rather than `.../message-page.jsp`, so I am performing a refactor
where either the `CatchAllFilter` or a service/utility method for the
sanitization will be moved to `nifi-web-utils` and then both `nifi-web-ui` and
`nifi-web-error` will consume this and register (the single filter or a filter
per URL) in their respective `web.xml` files.
This PR is not ready to be merged.
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