old_contents: from httpie.plugins import ConverterPlugin
  import json
  import msgpack
  
  DEFAULT_INDENT = 4
  
  class MsgpackPlugin(ConverterPlugin):
  
      @classmethod
      def supports(cls, mime):
        return 'x-msgpack' in mime
  
      def convert(self, body):
          return "application/json", \
              json.dumps(msgpack.loads(body), encoding="unicode-escape", sort_keys=True)
  
new_contents: import json
  
  import msgpack
  from httpie.plugins import ConverterPlugin
  
  DEFAULT_INDENT = 4
  
  
  class MsgpackPlugin(ConverterPlugin):
      @classmethod
      def supports(cls, mime):
          return 'msgpack' in mime
  
      def convert(self, body):
          return "application/json", \
                 json.dumps(msgpack.loads(body), encoding="unicode-escape", sort_keys=True)
  
subject: Support any msgpack mimetype