/usr/share/doc/perlbal/examples/not-modified-plugin.conf is in perlbal 1.80-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | LOAD vhosts
LOAD NotModified
# if you have a host that always serves immutable content, this plugin
# will reply 304 if client sent any "If-Modified-Since" header. since
# if they have SOME copy, it's the correct one.
CREATE SERVICE demo
SET listen = 0.0.0.0:8001
SET role = selector
SET plugins = vhosts, notmodified
SET persist_client = true
SET demo.notmodified.host_pattern = ^immutable\.
ENABLE demo
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