/usr/share/puppet/modules.available/puppetlabs-apache/templates/vhost/_header.erb is in puppet-module-puppetlabs-apache 3.0.0-1.
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 | <% if @headers and ! @headers.empty? -%>
## Header rules
## as per http://httpd.apache.org/docs/2.2/mod/mod_headers.html#header
<%- Array(@headers).each do |header_statement| -%>
<%- if header_statement != '' -%>
Header <%= header_statement %>
<%- end -%>
<%- end -%>
<% end -%>
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