How to apply filters on static files?

[StefanLiebig]

It seems that static content
staticFiles.location("/public")
will not be matched by filters:
before("/*") { req, res -> .... }

I need to do authentication/authorization in a filter.

Is the pattern wrong?
How can I achieve this?

(using spark 2.6.0)

[StefanLiebig]

I found this advice https://stackoverflow.com/questions/38154744/add-before-filter-for-static-files-in-sparkjava which works but has the downside that every request to static resources is leads to an error log in MatcherFilter: The requested route ... has not been mapped in Spark for ...

[perwendel]

Static files are served before the filters so currently there's no way of doing this (if using the static files functionality provided by the framework)