/usr/ is in ruby-http-form-data 1.0.1+gemwatch-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/http/
/usr/lib/ruby/vendor_ruby/http/form_data.rb
/usr/lib/ruby/vendor_ruby/http/form_data/
/usr/lib/ruby/vendor_ruby/http/form_data/multipart.rb
/usr/lib/ruby/vendor_ruby/http/form_data/file.rb
/usr/lib/ruby/vendor_ruby/http/form_data/urlencoded.rb
/usr/lib/ruby/vendor_ruby/http/form_data/multipart/
/usr/lib/ruby/vendor_ruby/http/form_data/multipart/param.rb
/usr/lib/ruby/vendor_ruby/http/form_data/version.rb
/usr/share/
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/http-form_data-1.0.1.gemspec
/usr/share/doc/
/usr/share/doc/ruby-http-form-data/
/usr/share/doc/ruby-http-form-data/copyright
/usr/share/doc/ruby-http-form-data/changelog.Debian.gz
/usr/share/doc/ruby-http-form-data/README.md