[Tue Mar 22 09:51:40.022898 2022] [ext_filter:trace1] [pid 5092:tid 3752] mod_ext_filter.c(623): [client 127.0.0.1:49837] filtering `/extfiltertest/hello.txt.crap' of type `text/plain' through `C:/Windows/System32/find.exe', cfg ExtFilterOptions NoLogStderr !PreserveContentLength ExtFilterInType text/plain ExtFilterOuttype text/plain
[Tue Mar 22 09:51:40.022898 2022] [ext_filter:error] [pid 5092:tid 3752] (22)Invalid argument: [client 127.0.0.1:49837] AH01465: apr_file_pipe_timeout_set(child output)
[Tue Mar 22 09:51:40.023737 2022] [ext_filter:error] [pid 5092:tid 3752] (22)Invalid argument: [client 127.0.0.1:49837] AH01468: ef_unified_filter() failed

ExtFilterDefine crapdenied mode=output \
    intype=text/plain outtype=text/plain \
    cmd="C:/Windows/System32/find.exe \"crap\""

<Location /extfiltertest>
# core directive to cause the new filter to
# be run on output
SetOutputFilter crapdenied

# mod_mime directive to set the type of .txt.crap
# files to text/plain
AddType text/plain .txt.crap

# mod_ext_filter directive to set the debug
# level just high enough to see a log message
# per request showing the configuration in force

# NOTICE: mod_ext_filter in httpd 2.4 doesn't have option DebugLevel
# ExtFilterOptions DebugLevel=1
</Location>