[Bug 65463] AddOutputFilterByType does not work for user-defined filters

[bu...@apache.org]

https://bz.apache.org/bugzilla/show_bug.cgi?id=65463

--- Comment #1 from Rich Bowen <rb...@apache.org> ---
Documented the limitation in the AddOutputFilterByType directive docs.

The underlying issue is that mod_filter's filter_bytype1() creates
an internal wrapper filter with a "BYTYPE:" prefix on the name
(e.g. "BYTYPE:myfilter"). When the harness calls the provider's
filter function, the modified name is passed through. Standard
compiled-in filters like DEFLATE don't care about the name, but
mod_ext_filter and mod_lua's LuaOutputFilter look up their
configuration by filter name and fail when they see the prefixed
version.

Added a warning note pointing users to FilterDeclare/FilterProvider
with a %{CONTENT_TYPE} expression as a workaround.

The code bug remains — the BYTYPE: prefix mangling should ideally
be transparent to provider filters.

Docs fixed in r1933776 (trunk), r1933777 (2.4).

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