The new WebMock release has fixed the Net::HTTP empty body bug.

bblimke/webmock@e015405

spec/support/shared_example_groups/hook_into_http_library.rb

@@ -56,7 +56,7 @@ def self.test_record_and_playback(description, query)
     test_record_and_playback "with a complex escaped query param", "q=#{CGI.escape("A&(! 234k !@ kasdj232\#$ kjw35")}"
 
     it 'plays back an empty body response exactly as it was recorded (e.g. nil vs empty string)' do
-      pending "awaiting an external fix", :if => library.gsub('_', '/').include?('net/http') do
+      pending "awaiting an external fix", :if => library.gsub('_', '/').include?('net/http') && library_hook_name != :webmock do
         get_body = lambda do
           VCR.use_cassette('empty_body', :record => :once) do
             get_body_object make_http_request(:get, "http://localhost:#{VCR::SinatraApp.port}/204")