Fri Aug 19 2022 15:54:01 UTC
It's not a bug, it's a feature.
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ID Product Comp Assignee Status Resolution Summary Changed
65463 Apache h mod_filt bugs NEW --- AddOutputFilterByType does not work for user-defined filters 2021-07-25
51312 Apache h mod_filt bugs NEW --- mod_filter should support adding to the Vary header 2011-06-01
2 bugs found.

as

File a new bug in the "mod_filter" component of the "Apache httpd-2" product