code: def decode(self, data: bytes) -> bytes:
          
          if CONTENT_TRANSFER_ENCODING in self.headers:
              data = self._decode_content_transfer(data)
          if CONTENT_ENCODING in self.headers:
              return self._decode_content(data)
          return data
docs: Decodes data according the specified Content-Encoding
          or Content-Transfer-Encoding headers value.