/usr/lib/ruby/vendor_ruby/rails/templates/rails/info/routes.html.erb is in ruby-railties 2:4.2.6-1.
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 | <h2>
Routes
</h2>
<p>
Routes match in priority from top to bottom
</p>
<%= @routes_inspector.format(ActionDispatch::Routing::HtmlTableFormatter.new(self)) %>
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