code: def register_msgpack():
      
      try:
          import msgpack
          registry.register('msgpack', msgpack.packs, msgpack.unpacks,
                  content_type='application/x-msgpack',
                  content_encoding='binary')
      except ImportError:
  
          def not_available(*args, **kwargs):
              """In case a client receives a msgpack message, but yaml
              isn't installed."""
              raise SerializerNotInstalled(
                      "No decoder installed for msgpack. "
                      "Install the msgpack library")
          registry.register('msgpack', None, not_available,
                            'application/x-msgpack')
docs: See http://msgpack.sourceforge.net/